Document:

<PAGE>

                                                                     EXHIBIT 4.6

THIS SECURITY HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933. NO SALE
OR DISPOSITION MAY BE EFFECTED WITHOUT THE PRIOR WRITTEN CONSENT OF THE COMPANY
OR WITHOUT AN EFFECTIVE REGISTRATION STATEMENT RELATED THERETO OR AN OPINION OF
COUNSEL FOR THE HOLDER, SATISFACTORY TO THE COMPANY, THAT SUCH REGISTRATION IS
NOT REQUIRED UNDER THE ACT OR RECEIPT OF A NO-ACTION LETTER FROM THE SECURITIES
AND EXCHANGE COMMISSION.

THE SALE OF THESE SECURITIES HAS NOT BEEN QUALIFIED WITH ANY STATE SECURITIES
AUTHORITIES. THE RIGHTS OF ALL PARTIES TO THIS WARRANT ARE EXPRESSLY CONDITIONED
UPON SUCH QUALIFICATION BEING OBTAINED UNLESS THE SALE IS SO EXEMPT.

THIS WARRANT MAY NOT BE EXERCISED EXCEPT IN COMPLIANCE WITH ALL APPLICABLE
FEDERAL AND STATE SECURITIES LAWS TO THE REASONABLE SATISFACTION OF THE COMPANY
AND LEGAL COUNSEL FOR THE COMPANY.

                                                        Void after April 6, 2004

                        WAVESPLITTER TECHNOLOGIES, INC.

                            STOCK PURCHASE WARRANT

                            _______________________

     THIS CERTIFIES THAT, for value received, Mayfield Associates Fund IV and
its registered assigns (hereinafter called the "Holder") is entitled to purchase
from WaveSplitter Technologies, Inc. (the "Company"), at any time after the date
specified in Section 1 hereof and ending at 5:00 p.m. Pacific Standard Time on
the Expiration Date, as such term is defined in Section 1 hereof, the shares of
the Company's Capital Stock determined by the schedule in Section 1 hereof.

     This Warrant is a "Warrant" referred to in that certain Loan Agreement
dated April 6, 1999 between the Company and certain Investors (the "Loan
Agreement"), and is subject to the terms of the Loan Agreement Unless otherwise
defined herein, capitalized terms used herein shall have the meanings ascribed
to them in the Loan Agreement.

     The Exercise Price per share of this warrant shall be (i) the price per
share of the Equity Security issued in the Next Financing, as such term is
defined in Section 4.1 of the Loan Agreement, if the Next Financing has occurred
prior to June 30, 1999, or (ii) $2.725 per share if the Next Financing has not
occurred prior to June 30, 1999. This Warrant may be exercised in whole or in
part, at the option of the Holder and in accordance with the schedule in Section
1 hereof.

     1.   Term and Vesting Schedule. This Warrant shall be exercisable through
          -------------------------
April 6, 2004 (the "Expiration Date") according to the following schedule:

            (a)  Next Financing. If the Next Financing has occurred prior to
                 --------------
June 30,1999, then this Warrant shall be exercisable for the number of shares of
the type of Equity Securities issued in the Next Financing equal to (i) fifteen
percent (15%) of the principal amount set forth opposite such
<PAGE>

Investor's name on Exhibit A to the Loan Agreement, divided by (ii) the Exercise
                   ---------
Price.

          (b)  No Next Financing. If the Next Financing has not occurred prior
               -----------------
to June 30, 1999, then this Warrant shall be exercisable for that number of
shares of Common Stock equal to (i) fifteen percent (15%) of the principal
amount set forth opposite such Investor's name on Exhibit A to the Loan
                                                  ---------
Agreement, divided by (B) $2.725.

          (c)  The shares of capital stock that become exercisable pursuant to
the terms of the Loan Agreement and this Warrant are hereinafter referred to as
the "Warrant Shares".

     2.   Method of Exercise: Payment: Issuance of New Warrant. Subject to
          ----------------------------------------------------
Section 1 hereof, the purchase right represented by this Warrant may be
exercised by the Holder, in whole or in part, by:

          2.1  the surrender of this Warrant (with the notice of exercise form
attached hereto as Attachment A and the Investment Representation Statement
attached hereto as Attachment B duly executed) at the principal office of the
Company; and

          2.2  the payment to the Company, by check or wire, of an amount equal
to the then applicable Warrant Price per share multiplied by the number of
Warrant Shares then being purchased.

          If this Warrant should be exercised in part only, the Company shall,
                                                                        -----
upon surrender of this Warrant, execute and deliver a new Warrant evidencing the
rights of the Holder thereof to purchase the balance of the Warrant Shares
purchasable hereunder. Upon receipt by the Company of this Warrant and such
notice of exercise, together with, if applicable, the aggregate Warrant Price,
at such office, or by the stock transfer agent or warrant agent of the Company
at its office, the Holder shall be deemed to be the holder of record of the
applicable Warrant Shares, notwithstanding that the stock transfer books of the
Company shall then be closed or that certificates representing such Warrant
Shares shall not then be actually delivered to the Holder. The Company shall pay
any and all documentary stamp or similar issue or transfer taxes payable in
respect of the issue or delivery of the Warrant Shares.

          2.3  Net Exercise. In addition to and without limiting the rights of
               ------------
the Holder under the terms of this Warrant, the Holder may elect to convert this
Warrant or any portion thereof (the "Conversion Right") into Warrant Shares, the
aggregate value of which Warrant Shares shall be equal to the value of this
Warrant or the portion thereof being converted. The Conversion Right may be
exercised by the Holder by surrender of this Warrant at the principal office of
the Company together with notice of the Holder's intention to exercise the
Conversion Right, in which event the Company shall issue to the Holder a number
of Warrant Shares computed using the following formula:

                    X   Y(A-B)
                       --------
                    =     A

     Where:

               X -  The number of Warrant Shares to be issued to the holder upon
                    exercise of Conversion Right.

               Y -  The number of Warrant Shares issuable under this Warrant.

                                      C-2
<PAGE>

                 A -  The fair market value of one Warrant Share, as determined
                      in good faith by the board of directors of the Company, as
                      at the time the Conversion Right is exercised pursuant to
                      this Section 2.

                 B -  Exercise Price (as adjusted to the date of such
                      calculations).

     3.   Stock Fully Paid: Reservation of Warrant Shares. All shares of stock
          -----------------------------------------------
which may be issued upon the exercise of the rights represented by this Warrant
will, upon issuance, be fully paid and nonassessable, and free from all taxes,
liens and charges with respect to the issue thereof.  During the period within
which the rights represented by this Warrant may be exercised, the Company will
at all times have authorized and reserved for the purpose of issue upon exercise
of the purchase rights evidenced by this Warrant, a sufficient number of shares
of its stock to provide for the exercise of the rights represented by this
Warrant.  In the event that there is an insufficient number of Warrant Shares
reserved for issuance pursuant to the exercise of this Warrant, the Company will
take appropriate action to authorize an increase in the capital stock to allow
for such issuance or similar issuance acceptable to the Holder.

     4.   Adjustment of Warrant Price and Number of Warrant Shares. The number
          --------------------------------------------------------
and kind of Warrant Shares purchasable upon the exercise of this Warrant and the
Warrant Price shall be subject to adjustment from time to time upon the
occurrence of certain events, as follows:

            4.1  Reclassification: Merger. In case of any reclassification or
                 ------------------------
change of outstanding securities of the class issuable upon exercise of this
Warrant (other than a change in par value, or from par value to no par value, or
from no par value to par value, or as a result of a subdivision or combination),
or in case of any consolidation or merger of the Company with or into another
corporation (other than a merger with another corporation in which the Company
is a continuing corporation and which does not result in any reclassification or
change of outstanding securities issuable upon exercise of this Warrant), or any
other corporate reorganization in which the Company shall not be the continuing
or surviving entity of such consolidation, merger or reorganization, or any
transaction in which in excess of 50% of the Company's voting power is
transferred, or any sale of all or substantially all of the assets of the
Company (a Merger Transaction"), the Company shall, as condition precedent to
such transaction, execute a new Warrant or cause such successor or purchasing
corporation, as the case may be, to execute a new Warrant, providing that the
Holder shall have the right to exercise such new Warrant and upon such exercise
to receive, in lieu of each share of stock theretofore issuable upon exercise of
this Warrant, the kind and amount of shares of stock, other securities, money
and property receivable upon such reclassification, change, merger or
acquisition by a holder of one share of stock. Such new Warrant shall provide
for adjustments which shall be as nearly equivalent as may be practicable to the
adjustments provided for in this Section 4. The provisions of this Section 4.1
shall similarly apply to successive reclassifications, changes, mergers, and
acquisitions.

            4.2  Subdivision or Combination of Warrant Shares. If the Company at
                 --------------------------------------------
any time while this Warrant remains outstanding and unexpired shall subdivide or
combine its stock, the Warrant Price shall be proportionately decreased in the
case of a subdivision or increased in the case of a combination.

            4.3  Stock Dividends. If the Company at any time while this Warrant
                 ---------------
is outstanding and unexpired shall pay a dividend with respect to stock payable
in, or make any other distribution with

                                      C-3
<PAGE>

respect to stock (except any distribution specifically provided for in the
foregoing Sections 4.1 and 4.2) of, stock, then the Warrant Price shall be
adjusted, from and after the date of determination of shareholders entitled to
receive such dividend or distribution, to that price determined by multiplying
the Warrant Price in effect immediately prior to such date of determination by a
fraction (i) the numerator of which shall be the total number of shares of stock
outstanding immediately prior to such dividend or distribution, and (ii) the
denominator of which shall be the total number of shares of stock outstanding
immediately after such dividend or distribution.

            4.4  Adjustment of Number of Warrant Shares. Upon each adjustment in
                 --------------------------------------
the Warrant Price, the number of shares of stock purchasable hereunder shall be
adjusted, to the nearest whole share, to the product obtained by multiplying the
number of Warrant Shares purchasable immediately prior to such adjustment in the
Warrant Price by a fraction, the numerator of which shall be the Warrant Price
immediately prior to such adjustment and the denominator of which shall be the
Warrant Price immediately thereafter.

            4.5  Acceleration upon IPO or Merger Transaction. Notwithstanding
                 -------------------------------------------
the provisions of Section 4.1 above, in the event of the consummation of a sale
by the Company of its Common Stock in a bona fide, firm commitment underwriting
pursuant to a registration statement under the Securities Act of 1933, as
amended (the "Act"), which results in aggregate gross cash proceeds to the
corporation in excess of $15,000,000 and a public offering price (prior to
underwriting discounts, commissions, or expenses) of not less than $7.50 per
share (adjusted to reflect subsequent stock dividends, stock splits or
recapitalizations) (herein, a "Qualified IPO"), or a merger Transaction, the
Company may, at its discretion, provide written notice of such transaction not
less than twenty (20) days prior thereto to the registered holder of the Warrant
giving notice of the impending transaction and of the Company's election to have
the Warrant expire upon the closing of such transaction, in which event,
notwithstanding any other provisions of this Warrant, any portion of this
Warrant that remains unexercised as of the time and date of such closing shall
expire.

     5.   Fractional Warrant Shares. No fractional Warrant Shares will be issued
          -------------------------
in connection with any exercise hereunder, but in lieu of such fractional shares
the Company shall make a cash payment therefor upon the basis of the Warrant
Price then in effect.

     6.   Compliance with Securities Act: Non-transferability of Warrant:
          ---------------------------------------------------------------
          Disposition of Shares of Stock.
          ------------------------------

            6.1  Compliance with Securities Act. The Holder, by acceptance
                 ------------------------------
hereof, agrees that this Warrant and the Warrant Shares are being acquired for
investment and that he will not offer, sell or otherwise dispose of this Warrant
or any Warrant Shares except under circumstances which will not result in a
violation of the Act. Upon exercise of this Warrant, the Holder hereof shall
confirm in writing, in a form of Attachment B, that the Warrant Shares so
purchased are being acquired for investment and not with a view toward
distribution or resale. In addition, the Holder shall provide such additional
information regarding such Holder's financial and investment background as the
Company may reasonably request. This Warrant and all Warrant Shares (unless
registered under the Act) shall be stamped or imprinted with a legend in
substantially the following form:

     "THIS SECURITY HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933. NO
     SALE OR DISPOSITION MAY BE EFFECTED WITHOUT THE PRIOR WRITTEN

                                      C-4
<PAGE>

     CONSENT OF THE COMPANY AND WITHOUT AN EFFECTIVE REGISTRATION STATEMENT
     RELATED THERETO OR AN OPINION OF COUNSEL FOR THE HOLDER, SATISFACTORY TO
     THE COMPANY, THAT SUCH REGISTRATION IS NOT REQUIRED UNDER THE ACT OR
     RECEIPT OF A NO-ACTION LETTER FROM THE SECURITIES AND EXCHANGE COMMISSION."

          6.2  Transferability of Warrant. This Warrant may not be transferred
               --------------------------
or assigned in whole or in part without (i) the prior written consent of the
Company and (ii) compliance with applicable federal and state securities laws;
provided, however, that the Warrant may be transferred without the prior written
--------  -------
consent of the Company in the following transactions:

          A transfer of the Warrant in whole by a Holder who is a natural person
during such Holder's lifetime or on death by will or intestacy to such Holder's
immediate family or to any custodian or trustee for the account of such Holder
or such Holder's immediate family. "Immediate family" as used herein shall mean
spouse, lineal descendant, father, mother, brother, or sister of the Holder.

          A transfer of the Warrant in whole to the Company or to any
shareholder of the Company.

          A transfer of the Warrant in whole or in part to a person who, at the
lime of such transfer, is or is an affiliate of an officer or director of the
Company.

          A transfer of the Warrant in whole pursuant to and in accordance with
the terms of any merger, consolidation, reclassification of shares or capital
reorganization of the corporate shareholder or pursuant to a sale of all or
substantially all of the stock or assets of a corporate shareholder.

          A transfer of the Warrant in whole to a parent, subsidiary or
   affiliate of a Holder.

          A transfer of the Warrant in whole by a Holder which is a limited or
general partnership to any of its partners or former partners.

          6.3  Disposition of Warrant Shares. Upon exercise of the Warrant
               -----------------------------
Shares, the Holder will be entitled to any registration rights granted the other
holders of securities issued in the Next Financing. With respect to any offer,
sale or other disposition of any Warrant Shares prior to registration of such
shares, the Holder and each subsequent Holder of this Warrant agrees to give
written notice to the Company prior thereto, describing briefly the manner
thereof, together with a written opinion of such Holder's counsel, if reasonably
requested by the Company, to the effect that such offer, sale or other
disposition may be effected without registration or qualification (under the Act
as then in effect or any federal or state law then in effect) of such Warrant
Shares and indicating whether or not under the Act certificates for such shares
to be sold or otherwise disposed of require any restrictive legend as to
applicable restrictions on transferability in order to ensure compliance with
the Act; provided, however, that no such opinion of counsel or no action letter
shall be necessary for a transfer without consideration by a Holder which is a
partnership to a partner of such partnership, so long as such transfer is made
pursuant to the terms of the partnership agreement, or to the transfer by gift,
will or intestate succession by the Holder to his or her spouse or lineal
descendants or ancestors or any trust for the benefit of any of the foregoing if
the transferee agrees in writing to be subject to the terms hereof to the same
extent as if he/she were an original Holder hereunder. Notwithstanding the
foregoing, such Warrant Shares may be offered, sold or otherwise disposed of in
accordance with Rule 144.

                                      C-5
<PAGE>

     7.   Rights of Shareholders. No Holder of this Warrant shall be entitled to
          ----------------------
vote or receive dividends or be deemed the holder of stock or any other
securities of the Company which may at any time be issuable on the exercise
hereof for any purpose, nor shall anything contained herein be construed to
confer upon the Holder of this Warrant, as such, any of the rights of a
shareholder of the Company or any right to vote for the election of directors or
upon any matter submitted to shareholders at any meeting thereof, or to give or
withhold consent to any corporate action (whether upon any recapitalization,
issuance of stock, reclassification of stock, change of par value or change of
stock to no par value, consolidation, merger, conveyance, or otherwise) or to
receive notice of meetings, or to receive dividends or subscription rights or
otherwise until this Warrant has been exercised and the Warrant Shares shall
have become deliverable, as provided herein.

     8.   Governing Law. The terms and conditions of this Warrant shall be
          -------------
governed by and construed in accordance with California law.

     9.   Miscellaneous. The headings in this Warrant are for purposes of
          -------------
convenience and reference only, and shall not be deemed to constitute a part
hereof. Neither this Warrant nor any term hereof may be changed, waived,
discharged or terminated orally, but only by an instrument in writing signed by
the Company and the registered Holder. All notices and other communications from
the Company to the Holder shall be delivered by hand or mailed by first-class
registered or certified mail, postage prepaid, to the address furnished to the
Company in writing by the Holder.

                               WAVESPLITTER TECHNOLOGIES, INC.

                            By: /s/ Bruce Pollock
                                -----------------------------------------
                                Bruce Pollock, Chief Financial Officer

                                      C-6
<PAGE>

                                 ATTACHMENT A

                              NOTICE OF EXERCISE
                              ------------------

TO: WaveSplitter Technologies, Inc.

     1.   The undersigned hereby elects to purchase _______ shares of _________
stock of WaveSplitter Technologies, Inc. pursuant to the terms of the attached
Warrant, and tenders herewith payment of the purchase price of such shares in
full, together with all applicable transfer taxes, if any.

     1.   The undersigned hereby elects to convert the attached Warrant into
Warrant Shares in the manner specified in Section 2.3 of the Warrant. This
conversion is exercised with respect to _______________________ of the Shares
covered by the Warrant

     [Strike paragraph above that does not apply.]

     2.   Please issue a certificate or certificates representing said shares of
stock in the name of the undersigned or in such other name as is specified
below:

                    Name: _____________________________

                    Address: ____________________________
                             ____________________________
                             ____________________________

     3.   The undersigned represents that the aforesaid shares of stock are
being acquired for the account of the undersigned for investment and not with a
view to, or for resale in connection with, the distribution thereof and that the
undersigned has no present intention of distributing or reselling such shares.
In support thereof, the undersigned has executed an Investment Representation
Statement attached hereto as Attachment B.

                              _________________________________________
                              WARRANTHOLDER

                              By: _____________________________________

                              Title: __________________________________

    Date: ________________
<PAGE>

                                 ATTACHMENT B

                      INVESTMENT REPRESENTATION STATEMENT
                      -----------------------------------

PURCHASER :

COMPANY   :    WAVESPLITTER TECHNOLOGIES, INC.

SECURITY  :

AMOUNT    :

DATE      :

In connection with the purchase of the above-listed securities and underlying
stock (the "Securities"), I, the Purchaser, represent to the Company the
following:

     (a)  I am aware of the Company's business affairs and financial condition,
and have acquired sufficient information about the Company to reach an informed
and knowledgeable decision to acquire the Securities. I am purchasing these
Securities for my own account for investment purposes only and not with a view
to, or for the resale in connection with, any "distribution" thereof for
purposes of the Securities Act of 1933 ("Securities Act").

     (b)  I understand that the Securities have not been registered under the
Securities Act in reliance upon a specific exemption therefrom, which exemption
depends upon, among other things, the bona fide nature of my investment intent
as expressed herein. In this connection, I understand that, in the view of the
Securities and Exchange Commission ("SEC"), the statutory basis for such
exemption may be unavailable if my representation was predicated solely upon a
present intention to hold these Securities for the minimum capital gains period
specified under tax statutes, for a deferred sale, for or until an increase or
decrease in the market price of the Securities, or for a period of one year or
any other fixed period in the future.

     (c)   I further understand that the Securities must be held indefinitely
unless subsequently registered under the Securities Act or unless an exemption
from registration is otherwise available. Moreover, I understand that the
Company is under no obligation to register the Securities. In addition, I
understand that the certificate evidencing the Securities will be imprinted with
a legend which prohibits the transfer of the Securities unless they are
registered or such registration is not required in the opinion of counsel for
the Company.

     (d)  I am aware of the provisions of Rule 144, promulgated under the
Securities Act, which, in substance, permits limited public resale of
"restricted securities" acquired, directly or indirectly, from the issuer
thereof (or from an affiliate of such issuer), in a non-public offering subject
to the satisfaction of certain conditions.

     (e)  I further understand that at the time I wish to sell the Securities
there may be no public market upon which to make such a sale.

     (f)  I further understand that in the event all of the requirements of Rule
144 are not satisfied, registration under the Securities Act, compliance with
Regulation A, or some other registration exemption will be required; and that,
notwithstanding the fact that Rule 144 is not
<PAGE>

exclusive, the Staff of the SEC has expressed its opinion that persons proposing
to sell private placement securities other than in a registered offering and
otherwise than pursuant to Rule 144 will have a substantial burden of proof in
establishing that an exemption from registration is available for such offers or
sales, and that such persons and their respective brokers who participate in
such transactions do so at their own risk.

                                          _____________________________
                                          WARRANTHOLDER

                                          _____________________________
                                                  (signature)

                                          _____________________________
                                                   (title)

                                          Date:_______________, _____<PAGE>

                                                                     EXHIBIT 4.7

THIS SECURITY HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933. NO SALE
OR DISPOSITION MAY BE, EFFECTED WITHOUT THE PRIOR WRITTEN CONSENT OF THE COMPANY
OR WITHOUT AN EFFECTIVE REGISTRATION STATEMENT RELATED THERETO OR AN OPINION OF
COUNSEL FOR THE HOLDER, SATISFACTORY TO THE COMPANY, THAT SUCH REGISTRATION IS
NOT REQUIRED UNDER THE ACT OR RECEIPT OF A NO-ACTION LETTER FROM THE SECURITIES
AND EXCHANGE COMMISSION.

THE SALE OF THESE SECURITIES HAS NOT BEEN QUALIFIED WITH ANY STATE SECURITIES
AUTHORITIES.  THE RIGHTS OF ALL PARTIES TO THIS WARRANT ARE EXPRESSLY
CONDITIONED UPON SUCH QUALIFICATION BEING OBTAINED UNLESS THE SALE IS SO EXEMPT.

THIS WARRANT MAY NOT BE EXERCISED EXCEPT IN COMPLIANCE WITH ALL APPLICABLE
FEDERAL AND STATE SECURITIES LAWS TO THE REASONABLE SATISFACTION OF THE COMPANY
AND LEGAL COUNSEL FOR THE COMPANY.

                                                        Void after April 6, 2004

                        WAVESPLITTER TECHNOLOGIES, INC.

                            STOCK PURCHASE WARRANT

                                   ---------

     THIS CERTIFIES THAT, for value received, LUCENT VENTURE PARTNERS INC. and
its registered assigns (hereinafter called the "Holder") is entitled to purchase
from WaveSplitter Technologies, Inc. (the "Company"), at any time after the date
specified in Section 1 hereof and ending at 5:00 p.m. Pacific Standard Time on
the Expiration Date, as such term is defined in Section 1 hereof, the shares of
the Company's Capital Stock determined by the schedule in Section 1 hereof.

     This Warrant is a "Warrant" referred to in that certain Loan Agreement
dated April 6, 1999 between the Company and certain Investors (the "Loan
Agreement"), and is subject to the terms of the Loan Agreement Unless otherwise
denied herein, capitalized terms used herein shall have the meanings ascribed to
them in the Loan Agreement

     The Exercise Price per share of this warrant shall be (i) the price per
share of the Equity Security issued in the Next Financing, as such term is
defined in Section 4.1 of the Loan Agreement, if the Next Financing has occurred
prior to June 30, 1999, or (ii) $2.725 per share if the Next Financing has not
occurred prior to June 30, 1999. This Warrant may be exercised in whole or in
part, at the option of the Holder and in accordance with the schedule in Section
1 hereof.
<PAGE>

     1.   Term and Vesting Schedule.  This Warrant shall be exercisable through
          -------------------------
April 6,2004 (the "Expiration Date") according to the following schedule:

          (a)  Next Financing.  If the Next Financing has occurred prior to June
               --------------
30,1999, then this Warrant shall be exercisable for the number of shares of the
type of Equity securities issued in the Next Financing equal to (i) fifteen
percent (15%) of the principal amount set forth opposite such Investor's name on

Exhibit A to the Loan Agreement, divided by (ii) the Exercise Price.
---------

          (b)  No Next Financing.  If the Next Financing has not occurred prior
               -----------------
to June 30, 1999, then this Warrant shall be exercisable for that number of
shares of Common Stock equal to (i) fifteen percent (15%).of the principal
amount set forth opposite such Investor's name on Exhibit A to the Loan
                                                  ----------
Agreement, divided by (B) $2.725.

          (c)  The shares of capital stock that become exercisable pursuant to
the terms of the Loan Agreement and this Warrant arc hereinafter referred to as
the "Warrant Shares".

     2.   Method of Exercise: Payment: Issuance of New Warrant.  Subject to
          ----------------------------------------------------
Section 1 hereof the purchase right represented by this Warrant may be exercised
by the Holder, in whole or in part, by:

          2.1  the surrender of this Warrant (with the notice of exercise form
attached hereto as Attachment A and the Investment Representation Statement
attached hereto as Attachment B duly executed) at the principal office of the
Company; and

          2.2  the payment to the Company, by check or wire, of an amount equal
to the then applicable Warrant Price per share multiplied by the number of
Warrant Shares then being purchased.

          If this Warrant should be exercised in part only, the Company shall,
upon surrender of this Warrant, execute and deliver a new Warrant evidencing the
rights of the Holder thereof to purchase the balance of the Warrant Shares
purchasable hereunder. Upon receipt by the Company of this Warrant and such
notice bf exercise, together with, if applicable, the aggregate Warrant Price,
at such office, or by the stock transfer agent or warrant agent of the Company
at its office, the Holder shall be deemed to be the holder of record of the
applicable Warrant Shares, notwithstanding mat the stock transfer books of the
Company shall then be closed or that certificates representing such Warrant
Shares shall not then be actually delivered to the Holder. The Company shah pay
any and all documentary stamp or similar issue or transfer taxes payable in
respect of the issue or delivery of the Warrant Shares.
<PAGE>

          2.3  Net Exercise. In addition to and without limiting the rights of
               ------------
the Holder under the terms of this Warrant, the Holder may elect to convert this
Warrant or any portion thereof (the "Conversion Right") into Warrant Shares, the
aggregate value of which Warrant Shares shall be equal to the value of this
Warrant or the portion thereof being converted. The Conversion Right may be
exercised by the Holder by surrender of this Warrant at the principal office of
the Company together with notice of the Holders intention to exercise the
Conversion Right, in which event the Company shall issue to the Holder a number
of Warrant Shares computed using the following formula:

                                   X Y(A-B)
                                     ------
                                       A

Where:

          X -  The number of Warrant Shares to be issued to the holder upon
               exercise of Conversion Right.

          V -  The number of Warrant Shares issuable under this Warrant.

          A -  The fair market value of one Warrant Share, as determined in good
               faith by the board of directors of the Company, as at the time
               the Conversion Right is exercised pursuant to this Section 2.

          B -  Exercise Price (as adjusted to the date of such calculations).

     3.   Stock Fully Paid: Reservation of Warrant Shares.  All shares of stock
          -----------------------------------------------
which may be issued upon the exercise of the rights represented by this Warrant
will, upon issuance, be fully paid and. nonassessable, and free from all taxes,
liens and charges with respect to the issue thereof. During the period within
which the rights represented by this Warrant may be exercised, the Company will
at all times have authorized and reserved for the purpose of issue upon exercise
of the purchase rights evidenced by this Warrant; a sufficient number of shares
of its stock to provide for the exercise of the rights represented by this
Warrant In the event that there is an insufficient number of Warrant Shares
reserved for issuance pursuant to the exercise of this Warrant; the Company will
take appropriate action to authorize an increase in the capital stock to allow
for such issuance or similar issuance acceptable to the Holder.

     4.   Adjustment of Warrant Price arid Number of Warrant Shares. The number
          ---------------------------------------------------------
and land of Warrant Shares purchasable upon the exercise of this Warrant and the
Warrant Price shall be subject to adjustment from time to time upon the
occurrence of certain events, as follows:
<PAGE>

          4.1  Reclassification: Merger. In case of any classification or change
               ------------------------
of outstanding securities of the class issuable upon exercise of this Warrant
(other than a change in par value, or from par value to no par value, or from no
par value to par value, or as a result of a subdivision or combination), or in
case of any consolidation or merger of the Company with or into another
corporation (other than a merger with another corporation in which the Company
is a continuing corporation and which does not result in any reclassification or
change of outstanding securities issuable upon exercise of this Warrant), or any
other corporate reorganization in which me Company shall not be the continuing
or surviving entity of such consolidation, merger or reorganization, or any
transaction in which in excess of 50% of the Company's voting power is
Transferred, or any sale of all or substantially all of the assets of the
Company (a Merger Transaction"), the Company shall, as condition precedent to
such transaction, execute a new Warrant or cause such successor or purchasing
corporation, as the case may be, to execute a new Warrant, providing that the
Holder shall have the right to exercise such new Warrant and upon such exercise
to receive, in lieu of each share of stock theretofore issuable upon exercise of
this Warrant, the kind and amount of shares of stock, other securities, money
and property receivable upon such reclassification, change, merger or
acquisition by a holder of one share of stock. Such new Warrant shall provide
for adjustments which shall be as nearly equivalent as maybe practicable to the
adjustments provided for in this Section 4. The provisions of this Section 4.1
shall similarly apply to successive reclassifications, changes, mergers, and
acquisitions.

          4.2  Subdivision or Combination of Warrant Shares.  If the Company at
               --------------------------------------------
any time while this Warrant remains outstanding and unexpired shall subdivide or
combine its stock, the Warrant Price shall be proportionately decreased in the
case of a subdivision or increased in the case of a combination.

          4.3  Stock Dividends.  If the Company at any time while this Warrant
               ---------------
is outstanding and unexpired shall pay a dividend with respect to stock payable
in, or make any other distribution with respect to stock (except any
       ----
distribution specifically provided for in the foregoing Sections 4.1 and 4.2)
of, stock, then the Warrant Price shall be adjusted, from and after the date of
determination of shareholders entitled to receive such dividend or distribution,
to that price determined by multiplying the Warrant Price in effect immediately
prior to such date of determination by a fraction.(i) the numerator of which
shall be the total number of shares of stock outstanding immediately prior to
such dividend or distribution, and (ii) the denominator of which shall be the
total number of shares of stock outstanding immediately after such dividend or
distribution.

          4.4  Adjustment of Number of Warrant Shares.  Upon each adjustment in
               --------------------------------------
the Warrant Price, the number of shares of stock purchasable hereunder shall be
adjusted, to the nearest whole share, to the product obtained by multiplying the
number of Warrant Shares purchasable immediately prior to such adjustment in the
Warrant Price by a fraction,
<PAGE>

the numerator of which shall be the Warrant Price immediately prior to such
adjustment and the denominator of which shall be the Warrant Price immediately
thereafter.

          4.5  Acceleration upon IPO or Merger Transaction.  Notwithstanding the
               -------------------------------------------
provisions of Section 4.1 above, in the event of the consummation of a sale by
the Company of its Common Stock in a bona fide, firm commitment underwriting
pursuant to a registration statement under the securities Act of 1933, as
amended (the "Act"), which results in aggregate gross cash proceeds to the
corporation in excess of $15,000,000 and a public offering price (prior to
underwriting discounts, commissions, or expenses) of not less than $7.50 per
share (adjusted to reflect subsequent stock dividends, stock splits or
recapitalizations) (herein, a "Qualified IPO"), or a merger Transaction, the
Company may, at its discretion, provide written notice of such transaction not
less than twenty (20) days 'or thereto to the registered holder of the Warrant
giving notice of the impending transaction and of the Company's election to have
the Warrant expire upon the closing of such transaction, in which event,
notwithstanding any other provisions of this Warrant, any portion of this
Warrant that remains unexercised as of the time and date of such closing shall
expire.

     5.   Fractional Warrant Shares.  No fractional Warrant Shares will be
          -------------------------
issued in connection with any exercise hereunder, but in lieu of such fractional
shares the Company shall make a cash payment therefor upon the basis of the
Warrant Price then in effect.

     6.   Compliance with Securities Act: Non-transferability of Warrant:
          ---------------------------------------------------------------
Disposition of Shares of Stock.
------------------------------

          6.1  Compliance with Securities Act.  The Holder, by acceptance
               ------------------------------
hereof, agrees that this Warrant and the Warrant Shares are being acquired for
investment and that he will not offer, sell or otherwise dispose of this Warrant
or any Warrant Shares except under circumstances which will not result in a
violation of the Act Upon exercise of this Warrant; the Holder hereof shall
confirm in writing, in a form of Attachment B, that the Warrant Shares so
purchased are being acquired for investment and not with a view toward
distribution or resale. In addition, the Holder shall provide such additional
information regarding such Holder's financial and investment background as the
Company may reasonably request. This Warrant and all Warrant Shares (unless
registered under the Act) shall be stamped or imprinted with a legend in
substantially the following form:

     "THIS SECURITY HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT
     OF 1933. NO SALE OR DISPOSITION MAY BE EFFECTED WITHOUT THE PRIOR
     WRITTEN CONSENT OF THE COMPANY AND WITHOUT AN EFFECTIVE
     REGISTRATION STATEMENT RELATED THERETO OR AN OPINION OF COUNSEL
     FOR TEE HOLDER, SATISFACTORY TO THE COMPANY, THAT SUCH
     REGISTRATION IS NOT REQUIRED UNDER THE ACT OR RECEIPT OF A NO-
     ACTION LETTER FROM THE SECURITIES AND EXCHANGE COMMISSION."
<PAGE>

          6.2  Transferability of Warrant.  This Warrant may not be transferred
               --------------------------
or assigned in whole or in part without (i) the prior written consent of the
Company and (ii) compliance with applicable federal and state securities laws;
provided, however, that the Warrant may be transferred without the prior written
--------  -------
consent of the Company in the following transactions:

               A transfer of the Warrant in whole by a Holder who is a natural
person during such Holder's lifetime or on death by will or intestacy to such
Holder's immediate family or to any custodian or trustee for the account of such
Holder or such Holder's immediate family. "Immediate family" as used herein
shall mean spouse, lineal descendant; father, mother, brother, or sister of the
Holder.

               A transfer of the Warrant in whole to the Company or to any
shareholder of the Company.

               A transfer of the Warrant in whole or in part to a person who
time of such transfer, is or is an affiliate of an officer or director of the
Company.

               A transfer of the Warrant in whole pursuant to and in accordance
with the terms of any merger, consolidation, reclassification of shares or
capital reorganization of the corporate shareholder or pursuant to a sale of all
or substantially all of the stock or assets of a corporate shareholder.

               A transfer of the Warrant in whole to a parent, subsidiary or
affiliate of a Holder.

               A transfer of the Warrant in whole by a Holder which is a limited
or general partnership to any of its partners or former partners.

          6.3  Disposition of Warrant Shares.  Upon exercise of the Warrant
               -----------------------------
Shares, the Holder will be entitled to any registration rights granted the other
holders of securities issued in the Next Financing. With respect to any offer,
sale or other disposition of any Warrant Shares prior to registration of such
shares, the Holder and each subsequent Holder of this Warrant agrees to give
written notice to the Company prior thereto, describing briefly the manner
thereof, together with a written opinion of such Holder's counsel, if reasonably
requested by the Company, to the effect that such offer, sale or other
disposition may be effected without registration or qualification (under the Act
as therein effect or any federal or state law then in effect) of such Warrant
Shares arid indicating whether or not under the Act certificates for such shares
to be sold or otherwise disposed of require any restrictive legend as to
applicable restrictions on transferability in order to ensure compliance with
the Act; provided, however, that no such opinion of counsel or no action letter
shall be necessary for a transfer without consideration by a Holder which is a
<PAGE>

partnership to a partner of such partnership, so long as such transfer is made
pursuant to the terms of the partnership agreement; or to the transfer by gift,
will or intestate succession by the Holder to his or her spouse or lineal
descendants or ancestors or any trust for the benefit of any of the foregoing if
the transferee agrees in writing to be subject to the terms hereof to the same
extent as if he/she were an original Holder hereunder. Notwithstanding the
foregoing, such Warrant Shares may be offered, sold or otherwise disposed of in
accordance with Rule 144.

     7.   Rights of Shareholders.  No Holder of this Warrant shall be entitled
          ----------------------
to vote or receive dividends or be deemed the holder of stock or any other
securities of the Company which may at any time be issuable on the exercise
hereof for any purpose, nor shall anything contained herein be construed to
confer upon the Holder of this Warrant, as such, any of the rights of a
shareholder of the Company or any right to vote for the election of directors or
upon any matter submitted to shareholders at any meeting thereof, or to give or
withhold consent to any corporate action (whether upon any recapitalization,
issuance of stock, reclassification of stock, change of par value or change of
stock to no par value, consolidation, merger, conveyance, or otherwise) or to
receive notice of meetings, or to receive dividends or subscription rights or
otherwise until this Warrant has been exercised and the Warrant Shares shall
have become deliverable, as provided herein.

     8.   Governing Law.  The terms and conditions of this Warrant shall be
          -------------
governed by and construed in accordance with California law.

     9.   Miscellaneous.  The headings in this Warrant are for purposes of
          -------------
convenience and reference only, and shall not be deemed to constitute a part
hereof Neither this Warrant nor any term hereof may be changed, waived,
discharged or terminated orally, but only by an instrument in writing signed by
the Company and the registered Holder. All notices and other communications from
the Company to the Holder shall be delivered by hand or mailed by first-class
registered or certified mail, postage prepaid, to the address furnished to the
Company in writing by the Holder.

                              WAVESPLITTER TECHNOLOGIES, INC.

                              By: /s/ Bruce Pollock
                                  -----------------------------------------
                                  Bruce Pollock, Chief Financial Officer
<PAGE>

                                 ATTACHMENT A

                              NOTICE OF EXERCISE
                              ------------------

TO:  WaveSplitter Technologies, Inc.

     1.   The undersigned hereby elects to purchase ___________ shares of
_____________ stock of WaveSplitter Technologies, Inc. pursuant to the terms of
the attached Warrant, and tenders herewith payment of the purchase price of such
shares in full, together with all applicable transfer taxes, if any.

     1.   The undersigned hereby elects to convert the attached Warrant into
Warrant Shares in the manner specified in Section 2.3 of the Warrant This
conversion is exercised with respect to ____________of the Shares covered by the
Warrant

[Strike paragraph above that does not apply.]

     2.   Please issue a certificate or certificates representing said shares of
stock in the name of the undersigned or in such other name as is specified below

               Name:  _________________________________

               Address: ________________________________
                        ________________________________
                        ________________________________

     3.   The undersigned represents that the aforesaid shares of stock are
being acquired for the account of the undersigned for investment and not with a
view to, or for resale in connection with, the distribution thereof and that the
undersigned has no present intention of distributing or reselling such shares.
In support thereof, the undersigned has executed an Investment Representation
Statement attached hereto as Attachment B.

                              __________________________________________
                              WARRANT HOLDER

                              By: _______________________________________

                              Title: _____________________________________
<PAGE>

Date: ___________________

                             ATTACHMENT B

                             INVESTMENT REPRESENTATION STATEMENT
                             -----------------------------------

PURCHASER :

COMPANY   :    WAVESPLITTER TECHNOLOGIES, INC.

AMOUNT    :

DATE      :

In connection with the purchase of the above-listed securities and underlying
stock (the "Securities"), I, the Purchaser, represent to the Company the
following:

          (a)  I am aware of the Company's business affairs and financial
condition, and have acquired sufficient information about the Company to reach
an informed and knowledgeable decision to acquire the securities. I am
purchasing these securities for my own account for investment purposes only and
not with a view to, or for the resale in connection with, any "distribution"
thereof for purposes of the securities Act of 1933 ("Securities Act").

          (b)  I understand that the securities have not been registered under
the Securities Act in reliance upon a specific exemption therefrom, which
exemption depends upon, among other things, the bona fide nature of my
investment intent as expressed herein. In this connection, I understand that, in
the view of the Securities and Exchange Commission ("SEC"), the statutory basis
for such exemption may be unavailable if my representation was predicated solely
upon a present intention to hold these securities for the minimum capital gains
period specified under tax statutes, for a deferred sale, for or until an
increase or decrease in the market price of the securities, or for a period of
one year or any other fixed period in the future.

          (c)  I further understand that the securities must be held
indefinitely unless subsequently registered under the Securities Act or unless
an exemption from registration is otherwise available. Moreover, I understand
that the Company is under no obligation to register the securities. In addition,
I understand that the certificate evidencing the securities will be imprinted
with a legend which prohibits the transfer of the securities unless they are
registered or such registration is not required in the opinion of counsel for
the Company.

                                       9
<PAGE>

          (d)  I am aware of the provisions of Rule 144, promulgated under the
Securities Act; which, in substance, permits limited public resale of
"Restricted Securities" acquired, directly or indirectly, from the issuer
thereof (or from an affiliate of such issuer), in a non public offering subject
to the satisfaction of certain conditions.

          (e)  I further understand that at the time I wish to sell the
securities there may be no public market upon which to make such a sale.

          (f)  I further understand that in the event all of the requirements of
Rule l44 are not satisfied, registration under the Securities Act compliance
with Regulation A, or some other registration exemption will be required and
that; notwithstanding the fact that Rule 144 is not exclusive, the Staff of the
SEC has expressed its opinion that persons proposing to sell private placement
securities other than in a registered offering and otherwise than pursuant to
Rule 144 will have a substantial burden of proof in establishing that an
exemption from registration is available for such offers or sales, and that such
persons and their respective brokers who participate in such transactions do so
at their own risk.

                                        __________________________________
                                        WARRANT HOLDER

                                        __________________________________
                                              (signature)

                                        __________________________________
                                              (title)

                                      10

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