Document:

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                                                                  EXHIBIT 4.1

                                COHERENT, INC.

                         PRODUCTIVITY INCENTIVE PLAN

                      (AS LAST AMENDED MARCH 24, 2000)

          1.      PURPOSE. The purpose of this Productivity Incentive Plan is
to afford an incentive to employees of Coherent, Inc. and its subsidiaries
and to enable Coherent, Inc. and its subsidiaries to retain and attract
personnel of the highest caliber who by their position, ability and diligence
are able to make important contributions to the Company's success.

          2.      DEFINITIONS.

                  (a)    "Company" means  Coherent, Inc. and its
majority-owned domestic and foreign subsidiaries the employees of which are
designated from time to time by the Board of Directors as eligible to
participate in the Plan.

                  (b)    "Common Stock" means the Common Stock, $.01 par
value, of the Company.

                  (c)    "Employee" means any person, including an officer or
director of the Company, who is customarily employed for at least twenty (20)
hours per week by, and receives a regular salary from, the Company.

                  (d)    "Participating Employee" means any Employee of the
Company, who has not elected to discontinue his or her participation in the
Plan.

                  (e)    "Three Month Period of the Plan" means the three
months commencing on or about October 1, January 1, April 1 and July 1 of
each fiscal year.

                  (f)    "Quarterly Base Earnings" means the aggregate
regular salary and earnings paid to a Participating Employee during each
Three Month Period of the Plan, exclusive of: bonuses, certain commissions as
determined by the Board of Directors from time to time, overtime payments,
lead or swing premiums, shift premiums, location cost premiums, or any other
form of extra compensation; Company payments for social security, worker's
compensation, unemployment compensation, or other Company payments required
by statute; or Company contributions for insurance, annuity, or employee
benefit plans.

                  (g)    "Quarterly Pre-tax Profit Percentage" means that
percentage calculated to the nearest tenth of a percent arrived at by
dividing (i) the consolidated pre-tax profit earned by the Company for the
Three Month Period of the Plan, after deduction of the total Amount of
Incentive Compensation under the Plan, by (ii) the Company's consolidated net
sales for the Three Month Period of the Plan.

                         The Quarterly Pre-tax Profit Percentage shall be
calculated by the Company, and such calculation shall be final and conclusive
on all participants. In determining such amounts, the Company may be entitled
to rely upon a certificate or estimate prepared by the Company's independent
public accountants or by the Company's chief accounting or financial officer.
After such determination, no recalculation shall be made on account of any
subsequent adjustments or for any other reason.

                  (h)    "Amount of Incentive Compensation" means that amount
arrived at by multiplying (i) the Quarterly Base Earnings of a Participating
Employee by (ii) fifty percent of the Quarterly Pre-tax Profit Percentage.

<PAGE>

                  (i)    "Fair Market Value of Common Stock" means the fair
market value of the Common Stock as determined by the Board of Directors of
the Company based on the closing price per share, as reported in the Wall
Street Journal on the last day of each Three Month Period of the Plan.

                  (j)    "Plan" means this Productivity Incentive Plan, as
amended from time to time.

          3.      ADMINISTRATION. The Plan shall be administered by the
management of the Company under the direction of the Board of Directors. The
administration, interpretation or application of the Plan by the Board or
management shall be final, conclusive and binding upon all participants.
Members of the Board of Directors and management are permitted to participate
in the Plan provided such persons are eligible Employees.

          4.      EFFECTIVE DATE. The effective date of the Plan was October
1, 1972.

          5.      PARTICIPATION. All Employees automatically become
participants in the Plan. Once an Employee elects to become a participant in
the Plan, such participation shall continue until the Employee has filed with
the Company a written statement on a form prescribed by the Company stating
his or her intention to discontinue participation.

          6.      DISTRIBUTION OF CASH OR COMMON STOCK. At the end of each
Three Month Period of the Plan, the Company shall distribute cash or shares
of Common Stock, at the election of the Participating Employee, to each
Participating Employee; provided, however, that only cash shall be
distributed to a Participating Employee when the Amount of Incentive
Compensation is less than one day's base earnings (i.e., eight hours) for
such Participating Employee. The Company will distribute cash to each
Participating Employee unless the Participating Employee notifies the Company
in writing on or before the last day of the Three Month Period that he or she
elects to receive Common Stock. The amount of cash distributed to a
Participating Employee shall be the Amount of Incentive Compensation. The
number of shares of Common Stock distributed to a Participating Employee
shall be that number arrived at by dividing the Amount of Incentive
Compensation by the Fair Market Value of Common Stock. No fractional shares
shall be distributed, but the dollar amount of such fractional share shall be
carried forward and included in the Amount of Incentive Compensation for the
succeeding Three Month Period if the Employee is still an eligible and
Participating Employee at that time.

          7.      DELIVERY OF CASH OR SHARE CERTIFICATES. As promptly as
practicable after each Three Month Period of the Plan, the Company shall
arrange to deliver to each Participating Employee who elected to receive
shares of Common Stock, the share certificates evidencing the shares of
Common Stock distributed for the Three Month Period of the Plan. As promptly
as practicable after each Three Month Period of the Plan, the Company shall
arrange to deliver to each Participating Employee who elected to receive
cash, a check in the amount of the cash distribution for the Three Month
Period.

          8.      TERMINATION OF EMPLOYMENT; DEATH. Upon termination of a
Participating Employee's employment for any reason, including retirement or
death, his participation in the Plan shall be automatically terminated. If
such termination occurs during a Three Month period of the Plan, such
Participating Employee shall not be entitled to any cash or stock
distribution for that period, unless the termination is caused by the
Employee's death, in which case his designated beneficiary shall receive a
cash or Common Stock distribution at the election of the designated
beneficiary, such election to be made on or before the last day of the
relevant Three Month Period, for the portion of the Three Month Period of the
Plan in which the Participating Employee's participation under the Plan was
effective.

          9.      TRANSFERABILITY. A Participating Employee's rights to
receive cash or shares of Common Stock under the Plan may not be assigned,
transferred, pledged or otherwise disposed of in any way by the Participating
Employee, except to the extent provided in Section 8.

<PAGE>

         10.      STOCK. The maximum number of shares of Common Stock which
shall be made available for distribution under the Plan shall be 2,125,000
shares, subject to adjustment upon changes in capitalization of the Company.
The shares of Common Stock to be distributed to Participating Employees may,
at the election of the Company, be either treasury shares or shares
authorized but unissued.

                  A Participating Employee shall have no interest in the
shares of Common Stock until such shares are distributed.

                  Shares of Common Stock to be distributed to a Participating
Employee under the Plan will be registered in the name of the Participating
Employee or in the name of the Participating Employee and his or her spouse,
or in the name of the Participating Employee's designated beneficiary
pursuant to Section 8.

         11.      AMENDMENT OR TERMINATION. The Board of Directors of the
Company may at any time terminate, modify, or amend the Plan; provided,
however, that approval of the holders of a majority of the outstanding shares
of the Company entitled to vote shall be required for any modification or
amendment which materially increases the benefits accruing hereunder to
Participating Employees, materially increases the number of shares issuable
pursuant to the Plan, or materially changes the standards of eligibility for
participation in the Plan.<PAGE>

                                                                    Exhibit 10.3

                                    * Certain confidential information contained
                                    in this document, marked by brackets, has
                                    been omitted and filed separately with the
                                    Securities and Exchange Commission pursuant
                                    to Rule 406 of the Securities Act of 1933,
                                    as amended.

               MANUFACTURERS REPRESENTATIVE/DISTRIBUTOR CONTRACT

This contract, made this 26th day of January, 1998, is by and between Oplink
Communications Inc. under the laws of the state of California USA, having its
corporate offices at 721 Charcot Drive, San Jose, CA 95131, USA, hereinafter
referred to as the "Principal" and DBX Communications Inc., having its
corporate office at 454 Morris Avenue, Springfield, NJ 07081, USA,
hereinafter referred to as the "Distributor".

The Principal and Distributor hereby Agree To:

1.0      GENERAL PROVISIONS - APPLYING TO DISTRIBUTOR ACTING AS EITHER A
         DISTRIBUTOR OR SALES REPRESENTATIVE

(a)      The Principal hereby appoints the Distributor, and the Distributor
         hereby agrees to act for the Principal as its exclusive selling agent
         for the Principal's products designated in Exhibit A.

(b)      It is understood that the Principal shall not exercise any control over
         the activities and the operations of the Distributor, each being
         recognized hereunder as an independent contractor.

(c)      It is also understood that the Principal shall not place any
         restrictions upon the number of other Principals which the Distributor
         may represent. However, the Distributor agrees that it will not
         represent other Principals whose products or services are considered by
         the Principal as competitive with the products or services of the
         Principal herein designated in Exhibit A (except by mutual agreement in
         writing).

(d)      The Distributor agrees to use its best efforts to promote and sell the
         Principal's products or services in the territory hereinafter
         designated in Exhibit C.

(e)      The Distributor and Principal agree that the Distributor may be
         referred to as an Authorized Distributor and Representative in
         advertising, signs, trade listings, directories, and similar sales
         instruments until this agreement is terminated.

(f)      The Distributor shall preserve in strict confidence any information it
         obtains concerning the business of the Principal including, without
         limitation, trade secrets, information concerning the design or
         manufacture of the products or services, customer list, financial
         information, and shall not disclose such information to any person or
         entity.

(g)      The Distributor shall continue to represent the principal as herein
         provided until either party elects to terminate the relationship by
         giving the other party not less than thirty (30) days advanced written
         notice during the first year, sixty (60) days during the second year,
         and ninety (90) days during the third year and so on (non cumulative).

(h)      The Principal shall be responsible for supplying all catalogs,
         specification sheets, product photographs and other sales material that
         are reasonable for promoting the sale of the Principal's products by
         Distributor.

(i)      Principal will from time to time make price adjustments and will
         promptly notify Distributor of such changes.

                                     1.

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(j)      At the Principal's discretion, this contract shall include any new
         products or services developed or added by the Principal during the
         life of this Contract, so long as they are not competitive with the
         products or services of other Principals then represented by the
         Distributor. The Distributor may, however, decline to sell any new
         products developed by the Principal, by providing written notice within
         20 days of product announcement to Distributor. In such a case,
         Principal shall have the right to secure another Distributor to sell
         the products declined by Distributor.

(k)      Principal agrees to refrain from hiring any Personnel from Distributor
         for twelve months after termination of this agreement.

(l)      Confirming order notices and shipping schedules will be supplied to
         Distributor, by Principal, within 7 days after receipt of Distributor's
         purchase orders, or purchase orders received directly from customers.

(m)      The Principal agrees to hold the Distributor harmless from all
         liability for infringement of any patent rights or other rights of
         third parties which may result from the Distributor's sale and
         distribution of the Principal's products.

2.0      GENERAL PROVISIONS FOR "DISTRIBUTOR" ACTING AS A SALES REPRESENTATIVE

(a)      The Distributor shall sometimes act as a representative on large orders
         to one customer, where it is mutually agreed that it would be
         impractical for Distributor to purchase products from Principal and
         resell them to the customer. In such circumstances, and where it is
         agreed by Distributor and Principal, Principal shall ship directly to
         the customer and pay Distributor a commission as described herein.

(b)      The Principal grants the Distributor the exclusive right to sell its
         products and services to any customer, with the exception of those
         house accounts designated in Exhibit B.

(c)      The Distributor shall not have the authority on behalf of the Principal
         to accept the return of, or to make any allowances with respect to, any
         of the products or services without the prior written approval of the
         Principal.

(d)      The Principal shall establish and have exclusive control over all
         prices, discounts, specifications, and terms governing the sale and
         shipments of products directly to the customer. The Distributor shall
         not accept orders in the Principal's name or make price quotations or
         delivery promises without the Principal's prior approval.

(e)      All orders are subject to the acceptance of, or rejection by, an
         authorized officer of the Principal. The customer shall be notified in
         writing by the Principal of its acceptance of or rejection of the order
         and a copy of such writing shall be transmitted to the Distributor.

(f)      The Distributor shall pay all of its sales expenses, including any
         expense of its sub-agents, incurred in connection with the
         representation as herein contemplated.

(g)      It is understood that the full responsibility of all collections rests
         with the Principal which exercise complete control over the approval of
         customers, credits, orders and contracts.

(h)      The Distributor is not authorized to vary, alter, enlarge, or limit
         orders for the Principal's products or services or make representations
         or guarantees without Principal's prior written approval.

(i)      The Principal shall be solely responsible for the design, development,
         supply, production and performance of its products hereunder and the
         protection of its trade name or names.

(j)      At the Principal's discretion, this contract shall include any new
         products or services developed or added by the Principal during the
         life of this contract, so long as they are not competitive with the
         products or services of other Principals than represented by the
         Distributor.

                                       2.

<PAGE>

(k)      Terms for all shipments directly to a customer in Territory by
         Principal, shall be as follows:

                                  1. FOB San Jose, California, USA
                                  2. Irrevocable letter of credit

2.1      COMMISSIONS:

(a)      The Principal shall pay the Distributor a commission of [ * ]% based on
         the total of the "net invoice price" of all commissionable orders
         received from the territory.

(b)      The term "net invoice price" shall mean the price at which the products
         or services are actually sold to the customer after excluding all
         shipping costs and any other allowances expressly granted to the
         customer by the Principal including, but not limited to taxes,
         discounts, and insurance.

(c)      Occasionally, price is not the sole factor determining the placement of
         an order. In such cases, a lesser commission rate will be accepted by
         the Distributor if it appears to be in the best interest of both
         parties and if the amount of such lesser commission is mutually agreed
         upon in writing before a quotation is sent to the customer.

(d)      The parties recognize that sometimes the engineering jurisdiction and
         the ship to location are in different territories. In such cases, a
         50/50 split commission will apply. In any territory where there is no
         Distributor under contract, the Principal shall be considered to be
         such agent with respect to commissions.

(e)      Commissions are due and payable on or before the Fifteenth day of the
         month following the month in which the Principal received payment from
         the customer.

(f)      The Principal shall supply the Distributor with copies of all
         commissionable orders received directly by the Principal and copies of
         all order confirmations, shipping notices or invoices originated at the
         time of shipment. The aforesaid copies are to be furnished to the
         Distributor no less frequently than at monthly intervals.

3.0      GENERAL PROVISIONS FOR "DISTRIBUTOR" ACTING AS DISTRIBUTOR

(a)      Distributor shall purchase products form Principal at International
         List Price, less [ * ]%, and resell them to customers in the territory.
         Such sales shall be referred to as "Distributor sales orders" here
         under.

(b)      Acceptance of "distributor sales orders" shall be at the sole judgment
         of Distributor.

(c)      Terms on all Distributor orders shall be as follows:

                           (i)      FOB San Jose, California, USA

                           (ii)     Payment Net 45 days, after approval of
                                    credit.

4.0      ADDITIONAL PROVISIONS

(a)      This instrument contains the entire contract between the parties
         pertaining to the subject matter hereof and supersedes any prior or
         contemporaneous agreements, representations, negotiations or
         understandings between the parties not herein expressly set forth. No
         supplement, modification, promise, addition or amendment of this
         contract shall be effective or binding unless executed in writing by
         both parties. The mere acknowledgement or acceptance of any order
         inconsistent with the terms of the contract, or the making of
         deliveries pursuant thereto, shall not be deemed acceptance or approval
         of such inconsistent provisions. No waiver of any of the provisions of
         this contract shall

-------------------
* CONFIDENTIAL TREATMENT REQUESTED

                                      3.

<PAGE>

         be deemed to constitute a waiver of any other provision, whether or
         not similar, nor shall any one waiver constitute a continuing waiver.

(b)      Neither the Principal nor the Distributor shall by reason of the
         termination of the contract be liable to the other for compensation,
         reimbursement, or damage either on account of present or prospective
         profits on sales, or on account of expenditures, investments or
         commitments made in connection with the establishment, development or
         maintenance of the business of goodwill of the Principal or the
         Distributor or on account of any cause or thing whatsoever, provided,
         however, that such termination shall not effect the rights or
         liabilities of the parties with respect to any indebtedness then owing
         by either party to the other. Termination activities shall immediately
         halt credit extension to the Distributor.

5.0      DISPUTES

(a)      This contract shall be construed in accordance with, and shall be
         governed by, the laws of the State of California, USA.

(b)      All disputes in connection with this contract shall be finally settled
         under the Rules of Conciliation and Arbitration of the International
         Chamber of Commerce by one arbitrator appointed in accordance with said
         rules.

(c)      In the event of any litigation or arbitration between the parties
         hereto respecting or arising out of this contract, the prevailing
         party, whether or not such litigation proceeds to final judgment or
         determination, shall be entitled to recover all of the attorneys' fees,
         costs, in each and every such action, suit or other proceeding,
         including any and all appeals or petitions therefrom.

6.0      ASSIGNMENT

(a)      This contract is not transferable to others. Any change of ownership or
         primary control of the Distributor's company shall require a new
         Representation/Distribution contract.

(b)      Neither this contract nor any right or interest in it may be assigned
         by either party to any other person or corporation without the express
         written consent of the other party to this contract.

7.0      MISCELLANEOUS

(a)      The parties shall each execute any and all other documents and take any
         and all further steps which may be necessary or appropriate to
         implement the terms of this contract.

(b)      This contract shall be binding upon, and shall inure to the benefit of,
         each of the parties and their respective heirs, legal distributors,
         predecessors, successors, assignees, employees, partners, lawyers and
         all other persons and entities now, heretofore or hereafter having
         interest whatsoever with respect to the subject matter hereof.

(c)      Each of the parties hereto represents and warrants, as an inducement to
         the other to enter into this contract, that this contract is entered
         into freely and voluntarily by each of them, free of duress, fraud or
         undue influence of any kind, including contentions, and circumstances
         likely to influence judgment herein, and that each has read and fully

                                       4.

<PAGE>

         understands and consents to all the terms and provisions of this
         contract. The parties each further acknowledge that they each have
         either consulted with legal and tax counsel or have been given more
         than adequate opportunity to do so and elected not to seek counsel,
         that they have each actively participated in the negotiation and in the
         preparation hereof, and that they each understand the substance,
         meaning, content and legal effect of this contract.

(d)      The parties agree and acknowledge that if any portion of this contract
         is declared invalid, or unenforceable, such determination shall not
         effect the balance of this contract, but shall remain in full force and
         affect, as such invalid portion shall be deemed severable.

IN WITNESS OF, the parties hereto have executed this contract on the date and
year first shown herein.

DISTRIBUTOR                                     PRINCIPAL

By:   /s/ Alex Hsu                              By:   /s/ illegible
    ----------------------------                   --------------------------
Title:   President                              Title:   CTO
      --------------------------                     ------------------------

                                    5.

<PAGE>

                               [OPLINK LOGO]

FAX: (408) 433-0608                       PHONE: (408) 433-0606

TO:           Dean Brosie                 FROM:    QIN ZHANG
COMPANY:      DBX                         Page     1
CC:                                       DATE:    7/28/1999
Regards       Commission Schedule         Fax #:   1-973-379-4939

Dear Dean,

Due to the overall dramatic price erosion, Oplink is now seeking every way to
stay competitive in the industry.

To do so, we will have to reduce our cost in a very agrgressive manners.
Hence, after reviewing your commission schedule, we will reduce the
commission with DBX for the [ * ] products to [ * ]% and for [ * ] products
to [ * ]%, effective October 1, 1999.

Once again, the significant drop of the selling price for the [ * ] products
have posed a serious financing constraint to Oplink and your understanding
shall be greatly appreciated. In general, Dean, we would expect your
commission on new business to remain [ * ]% but be reduced to approx. [ * ]%
when significant volume production begins. The [ * ], hopefully is an
exception which results from the severe price erosion on this product. Should
you have any questions, please feel free to contact us.

Best regards,

Qin Zhang

/s/ Qin Zhang

-----------------------
* CONFIDENTIAL TREATMENT REQUESTED

<PAGE>

                              [OPLINK LOGO]

FAX: (408) 433-0608                      PHONE:         (408) 433-0606

TO:             Dean Brosie              FROM:           QIN ZHANG
COMPANY:              DXB                Page                    1
CC:                                      DATE:           3/15/1999
Regards         Representation           Fax #:          1-973-379-4939

Dear Dean,

For the last two years, DXB has performed superbly in servicing the Lucent and
ADC accounts. Oplink is committed to supporting you, Lucent and ADC. However,
due to increasing market pressure on price, we are forced to cut our profit in
order to stay competitive. Under current high pressure from both customers and
competitors, it is inevitable that we need to, from time to time, review our
representatives' commission schedule. This letter is to inform you that the
commision schedule for DBX will be changed, effective July 1, 1999.

The revised commission will be [ * ] % on [ * ] products, [ * ] and [ * ]
components. For accounts and products not mentioned above, your commision will
be revised to [ * ]%.

Should you have any questions, please feel free to contact us. We are looking
forward to your reply.

Thank you very much,

Best regards,

Qin Zhang

--------------------------
*CONFIDENTIAL TREATMENT REQUESTED

<PAGE>

                             [OPLINK LOGO]

FAX: (408) 433-0608                                PHONE:  (408) 433-0606

TO:        Dean Brosie                             FROM:    QIN ZHANG
COMPANY:         DBX                               Page             1
CC:        Alex Hsu                                DATE:    1/11/2000
Regards    Commission and stock option (revised)   Fax #:   1-973-379-4939

Dear Dean,

As Oplink's most valued business partner, we appreciate what you have
contributed to Oplink for the last three year. The following is summary of our
phone conversation on January 6, 2000.

     1.  Oplink will grant Mr. Dean Brosie with 100,000 share of common stock at
         $1.50. The vesting schedule is 75,000 share immediately vested. The
         remaining 25,000 shares will be vested on January 1, 2001.

     2.  Mr. Dean Brosie will accept commission rescheduling based on the
         following table, effective April 1, 2000.

              -   New product order                     [ * ]%
              -   Existing product order                [ * ]%
              -   [ * ] order                           [ * ]%
              -   New product order is defined as 6-month period starting from
                  the date when customer first places order onward.

     3.  Both Oplink and Mr. Dean Brosie mutually agree to extend the advance
         notification requirement for termination of agreement from 3-month to
         12-month if one party decides to terminate the relationship.

Please feel free to contact me if you have any questions.

Best regards,

Qin Zhang

Accepted by:                            Date:
            ----------------------            ---------------------------

------------------------
*CONFIDENTIAL TREATMENT REQURESTED

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