Amended and Restated Warrant



 Exhibit 4.26 
 AMENDED AND RESTATED WARRANT 
 THIS WARRANT AND THE WARRANT STOCK
ISSUABLE UPON EXERCISE HEREOF HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE “ACT”), AND HAVE BEEN ACQUIRED FOR INVESTMENT AND NOT WITH A VIEW TO, OR IN CONNECTION WITH, THE SALE OR DISTRIBUTION THEREOF. NO SUCH
SALE OR DISTRIBUTION MAY BE EFFECTED WITHOUT AN EFFECTIVE REGISTRATION STATEMENT RELATED THERETO OR AN OPINION OF COUNSEL IN A CUSTOMARY FORM THAT SUCH REGISTRATION IS NOT REQUIRED UNDER THE SECURITIES ACT. 
  

			
	Company:	  	Optical Solutions, Inc., a Delaware corporation
	Number of Shares:	  	360,000
	Class of Stock:	  	Series III Preferred Stock
	Exercise Price:	  	$1.00 / share
	Issue Date:	  	August 2, 2005
	Expiration Date:	  	August 2, 2012

 WHEREAS, Optical Solutions, Inc. (the “Company”) has issued to the Holder
(as defined below), a Warrant (“Existing Warrant”) for the purchase of 360,000 shares of the Company’s Series III Preferred Stock dated August 2, 2005; 
 WHEREAS, the Company has entered into an Agreement and Plan of Merger (the “Merger Agreement”) dated as of November 8, 2005,
as amended on December 29, 2005, by and among the Company, Calix Networks, Inc. (“Calix”) and a wholly-owned subsidiary of Calix, pursuant to which a wholly-owned subsidiary of Calix will be merged with and into the Company (the
“Merger”) and the Company will survive the Merger as a wholly-owned subsidiary of Calix. Capitalized terms used herein and not otherwise defined herein have the meaning set forth in the Merger Agreement; 
 WHEREAS, pursuant to the Merger Agreement, all outstanding warrants to purchase capital stock of the Company will be assumed by Calix in
connection with the Merger, subject to the terms and provisions set forth in the Merger Agreement; 
 WHEREAS, pursuant to the
terms of the Merger Agreement, Calix will assume the Company’s obligations under the Existing Warrant as set forth herein; and 
 WHEREAS, effective as of the Effective Time of the Merger, the parties desire to amend and restate the Existing Warrant as set forth herein and, upon the Effective Time, this Warrant shall become effective and the Existing Warrant shall
terminate. 
 NOW THEREFORE, in consideration of the Company executing and delivering this Warrant and the cancellation of the
Existing Warrant and in consideration of the mutual covenants and agreements contained herein, the Company and Holder agree as follows: 
 The term “Holder” shall initially refer to Partners for Growth, L.P., a Delaware limited partnership, which is the initial holder of this Warrant and shall further refer to any subsequent
permitted holder of this Warrant from time to time. 







 The Company does hereby certify and agree that, for the agreed sum of $3,600 and for other
good and valuable consideration, Holder, or its permitted successors and assigns, hereby is entitled to purchase from the Company Three Hundred Sixty Thousand (360,000) duly authorized, validly issued, fully paid and non-assessable shares of
the Company’s Series III Preferred Stock (the “Series III Stock”, and such number of shares of Series III Stock, the “Warrant Stock”) upon the terms and subject to the provisions of this Warrant. 
 Section 1. Term, Price and Exercise of Warrant. 
 1.1 Term of Warrant. This Warrant shall be exercisable for a period commencing on the Issue Date set forth above and expiring on the Expiration Date set forth above (hereinafter referred to as the
“Expiration Date”). 
 1.2 Exercise Price. The price per share at which the shares of Warrant Stock are
issuable upon exercise of this Warrant shall be $1.00, subject to adjustment from time to time as set forth herein (the “Exercise Price”). 
 1.3 Exercise of Warrant. 
 (a) This Warrant may be exercised or converted,
in whole or in part, upon surrender to the Company at its then principal offices of this Warrant, together with the form of Election to Exercise attached hereto as Exhibit A duly completed and executed, and upon payment to the Company of the
Exercise Price for the number of shares of Warrant Stock in respect of which this Warrant is then being exercised. 
 (b)
Payment of the aggregate Exercise Price may be made (i) in cash or by cashier’s or bank check or (ii) by converting this Warrant through a Cashless Exercise (as defined herein). Upon a “Cashless Exercise” Holder shall
receive shares of Series III Stock on a net basis such that, without the payment of any funds, Holder shall surrender this Warrant in exchange for the number of shares of Series III Stock equal to “X” (as defined in the equation below):

 X = Y * (A-B) 
               A 
 Where:

  

					
	X	  	=	  	the number of shares of Warrant Stock to be issued to Holder
			
	Y	  	=	  	the number of shares of Warrant Stock subject to exercise under this Warrant
			
	A	  	=	  	the Fair Market Value of one share of the Company’s Warrant Stock
			
	B	  	=	  	the Exercise Price (as adjusted to the date of such calculations)

 (c) For purposes of the above calculation, the “Fair Market Value” of one
share of Warrant Stock shall be (i) if the Company’s common stock (the “Common Stock”) is or becomes listed on a national stock exchange or the Nasdaq Market, the highest closing sale price

  

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reported on such exchange or market for the 90-day period prior to the earlier of the day Holder delivers its Election of Exercise to the Company or the date of determination of Fair Market
Value, or (ii) if the Common Stock is traded over-the-counter, the highest closing bid price for the Common Stock over the 90-day period immediately prior to the earlier of the day Holder delivers its Election of Exercise to the Company or the
date of determination of Fair Market Value. If the Common Stock is not traded as contemplated in clauses (i) or (ii) above, the Fair Market Value of the Warrant Stock shall be the price per share which the Company could obtain from a
willing buyer for one share of Warrant Stock sold by the Company from its authorized but unissued shares, as the Board of Directors of the Company shall determine in its reasonable good faith judgment; provided however, if Holder disagrees with the
Board of Director’s determination of Fair Market Value, such price which a financial appraiser to be mutually agreed states in writing to be in its opinion the Fair Market Value of a share of Warrant Stock on a sale as between a willing seller
and a willing purchaser (taking no account of whether the Warrant Stock comprises a minority holding or carries control of the Company) and upon the assumption that the Company will continue to do business as a going concern. In stating the Fair
Market Value, if a financial appraiser is required to be engaged, such appraiser (whose charges shall be borne equally by the Company and Holder) shall be considered to be acting as an expert and not as an arbitrator and its decision shall be final
and binding on the parties. In the event that Holder elects to convert the Warrant through Cashless Exercise in connection with a transaction in which the Warrant Stock is converted into or exchanged for another security, Holder may effect a
Cashless Exercise directly into such other security. Notwithstanding the right of the Holder to effect a Cashless Exercise, the Company may require Holder to exercise this Warrant for cash if the Warrant Stock is registered under the Act, may be
traded by Holder without restriction under Securities and Exchange Commission rules and regulations and applicable law and such freely- tradable Warrant Stock (or Common Stock underlying the Warrant Stock) issuable upon exercise of this Warrant is
delivered within three (3) business days of Holder’s exercise. 
 (d) Subject to Section 2 hereof, upon surrender
of this Warrant and the duly completed and executed form of Election to Exercise and payment of the Exercise Price or conversion of this Warrant through Cashless Exercise, the Company shall cause to be issued and delivered within three
(3) business days to Holder or such other person as Holder may designate in writing a certificate or certificates for the number of shares of Warrant Stock so purchased upon the exercise or conversion of this Warrant. Such certificate or
certificates shall be deemed to have been issued and any person so designated to be named therein shall be deemed to have become a holder of record of such shares of Warrant Stock as of the date of the surrender of this Warrant, and the duly
completed and executed form of Election to Exercise, and payment of the Exercise Price or conversion of this Warrant through Cashless Exercise; provided, that if the date of surrender of this Warrant and payment of the Exercise Price is not a
business day, the person designated to acquire the Warrant Stock under the Election to Exercise shall be deemed to acquire the Warrant Stock as of the next business day (whether before or after the Expiration Date). If this Warrant is exercised or
converted in part, a new warrant of the same tenor and for the number of shares of Warrant Stock not exercised or converted shall be executed by the Company. 
 1.4 Fractional Interests. The Company shall not be required to issue fractions of shares of Series III Stock upon the exercise of this Warrant. If any fraction of a share of Series III Stock would
be issuable upon the exercise of this Warrant (or any portion thereof), the

  

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Company shall purchase such fraction for an amount in cash equal to the Fair Market Value of such fractional share, as such value is determined under Section 1.3(c) above. 
 1.5 Treatment of Warrant Upon Acquisition of Company. 
 (a) “Acquisition.” For the purpose of this Warrant, “Acquisition” means any sale or other disposition of all or substantially all of the assets of the Company in whatever form,
or any reorganization, consolidation, or merger of the Company where the holders of the Company’s securities before the transaction beneficially own less than 50% of the outstanding voting securities of the surviving entity after the
transaction. 
 (b) Treatment of Warrant at Acquisition. 
 (i) Upon the written request of the Company, Holder agrees that, in the event of an Acquisition in which the sole
consideration is cash, either (A) Holder shall exercise its conversion or purchase right under this Warrant and such exercise will be deemed effective immediately prior to the consummation of such Acquisition or (B) if Holder elects not to
exercise the Warrant, this Warrant will expire upon the consummation of such Acquisition. The Company shall provide the Holder with written notice of its request relating to the foregoing (together with such reasonable information as the Holder may
request in connection with such contemplated Acquisition giving rise to such notice), which is to be delivered to Holder not less than ten (10) days prior to the closing of the proposed Acquisition. 
 (ii) Upon the written request of the Company, Holder agrees that, in the event of an Acquisition that is an “arms
length” sale of all or substantially all of the Company’s assets (and only its assets) to a third party that is not an Affiliate (as defined below) of the Company (a “True Asset Sale”), either (A) Holder shall exercise its
conversion or purchase right under this Warrant and such exercise will be deemed effective immediately prior to the consummation of such Acquisition or (B) if Holder elects not to exercise the Warrant, this Warrant will continue until the
Expiration Date if the Company continues as a going concern following the closing of any such True Asset Sale. The Company shall provide the Holder with written notice of its request relating to the foregoing (together with such reasonable
information as the Holder may request in connection with such contemplated Acquisition giving rise to such notice), which is to be delivered to Holder not less than ten (10) days prior to the closing of the proposed Acquisition. 
 (iii) Upon the closing of any Acquisition other than those particularly described in subsections (i) and
(ii) above, the successor entity shall assume the obligations of this Warrant, and this Warrant shall be exercisable for the same securities, cash, and property as would be payable for the Warrant Stock issuable upon exercise of the unexercised
portion of this Warrant as if such Warrant Stock were outstanding on the record date for the Acquisition and subsequent closing. The Warrant Price and/or number of shares of Warrant Stock shall be adjusted accordingly. 
  

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 (iv) As used herein “Affiliate” shall mean any person or
entity that owns or controls directly or indirectly ten percent (10%) or more of the stock of Company, any person or entity that controls or is controlled by or is under common control with such persons or entities, and each of such
person’s or entity’s officers, directors, joint venturers or partners, as applicable. 
 Section 2. Exchange and Transfer of
Warrant. 
 2.1 Transfer of Warrant. This Warrant and the Warrant Stock issuable upon exercise of this Warrant (and
the securities issuable, directly or indirectly, upon conversion of the Warrant Stock) may be transferred, in whole or in part, without restriction, subject to Holder’s delivery of an opinion of counsel that such transfer is in compliance with
applicable securities laws; provided, however, that an opinion of counsel shall not be required if the transfer is to an Affiliate of Holder or if there is no material question as to the availability of current information as referenced in Rule
144(c), Holder represents that it has complied with Rule 144(d) and (e) in reasonable detail, the selling broker represents that it has complied with Rule 144(f), and the Company is provided with a copy of Holder’s notice of proposed sale.
A transfer may be registered with the Company by submission to it of this Warrant, together with the annexed Assignment Form attached hereto as Exhibit B duly completed and executed. After the Company’s receipt of this Warrant and the
Assignment Form so completed and executed, the Company will issue and deliver to the transferee a new warrant (representing the portion of this Warrant so transferred) at the same Exercise Price per share and otherwise having the same terms and
provisions as this Warrant, which the Company will register in the new holder’s name. In the event of a partial transfer of this Warrant, the Company shall concurrently issue and deliver to the transferring holder a new warrant that entitles
the transferring holder to purchase the balance of this Warrant not so transferred and that otherwise is upon the same terms and conditions as this Warrant. Upon the due delivery of this Warrant for transfer, the transferee holder shall be deemed
for all purposes to have become the holder of the new warrant issued for the portion of this Warrant so transferred, effective immediately prior to the close of business on the date of such delivery, irrespective of the date of actual delivery of
the new warrant representing the portion of this Warrant so transferred. Subject to compliance with the requirements of the first sentence of this Section 2.1, and upon providing Company with written notice, any subsequent Holder of this
Warrant or any part hereof may transfer all or part of this Warrant or the shares of Warrant Stock issuable upon exercise of this Warrant (or the securities issuable directly or indirectly, upon conversion of the Warrant Stock) to any transferee,
provided, however, in connection with any such transfer, any subsequent Holder will give the Company notice of the portion of the Warrant being transferred with the name, address and taxpayer identification number of the transferee and Holder will
surrender this Warrant to the Company for reissuance to the transferee(s) (and Holder if applicable). 
 2.2 Loss, Theft,
Etc. In the event of the loss, theft or destruction of this Warrant, the Company shall execute and deliver an identical new warrant to Holder in substitution therefor upon the Company’s receipt of (i) evidence reasonably satisfactory
to the Company of such event and (ii) if requested by the Company, an indemnity agreement reasonably satisfactory in form and substance to the Company. In the event of the mutilation of or other damage to the Warrant, the Company shall execute
and deliver an identical new warrant to Holder in substitution therefor upon the Company’s receipt of the mutilated or damaged warrant. 
  

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 Section 3. Certain Covenants. 
 3.1 Reservation of Shares. The Company shall at all times reserve for issuance and keep available out of its authorized and unissued
shares of Series III Stock and Common Stock, solely for the purpose of providing for the exercise of this Warrant, such number of shares of Series III Stock (and Common Stock issuable upon conversion thereof) as shall from time to time be sufficient
therefor. 
 3.2 Non-Avoidance. The Company will not, by amendment of its Certificate of Incorporation, Bylaws or through
reorganization, consolidation, merger, sale of assets or otherwise, avoid or seek to avoid the observance or performance of any of the terms of this Warrant. Without limiting the foregoing, the Company (i) will not increase the par value of any
shares of capital stock receivable upon the exercise of this Warrant above the amount payable therefor upon such exercise and (ii) will take all such action as may be necessary or appropriate in order that the Company may validly and legally
issue fully paid and nonassessable shares of capital stock upon the exercise of this Warrant. 
 3.3 Registration Under
Securities Act of 1933, as amended. The Company agrees that the Warrant Stock shall have certain incidental, or “Piggyback”, registration rights pursuant to and as set forth for the benefit of the holders of Series III Preferred Stock
in Section 1.3 of the Company’s Fourth Amended and Restated Registration Rights Agreement dated as of July 8, 2003 (the “Registration Rights Agreement), as may be amended from time to time; provided, however, that to the extent
the underwriter (and only the underwriter) requests a cut-back of Registrable Securities (as defined therein) proposed to be registered in such underwriting, Holder agrees that its rights under this Section shall be subordinated in priority to the
rights of the other holders of Registrable Securities. Section 1.3 of the Registration Rights Agreement as in effect as of the Issue Date may not be modified or waived without the prior written consent of Holder unless such amendment,
modification or waiver affects the rights associated with the Warrant Stock in the same manner as such amendment, modification or waiver affects the rights associated with all other shares of the same series and class as the Warrant Stock held by
persons that are parties to the Registration Rights Agreement. For the avoidance of doubt, the Holder agrees to be bound to the same extent and on the same terms and conditions of other grantees of registration rights pursuant to the Registration
Rights Agreement, including any market stand-off provisions requiring the Holder, upon request of the Company or the underwriters managing any underwritten offering of the Company’s securities, not to sell, make any short sale of, loan, grant
any option for the purchase of, or otherwise dispose of any Registrable Securities (as such term is defined in the Registration Rights Agreement), other than those included in the registration, without the prior written consent of the Company or any
such underwriters, as the case may be, for such period of time (not to exceed 180 days but subject to such extension or extensions as may be required by the underwriters in order to publish research reports while complying with Rule 2711 of the
National Association of Securities Dealers Inc.) from the effective date of such registration as may be requested by the underwriters. Holder hereby acknowledges and agrees that, upon the consummation of the Merger, this Section 3.3 shall be
null and void and Holder shall, instead, upon the exercise of this Warrant, have the “piggyback” registration rights and be subject to all related obligations of a holder of Calix Series H Preferred Stock relating to such
“piggyback” registration rights as set forth in Calix’s Amended and Restated Investor’s Rights Agreement (the “Calix Investor Rights Agreement”). The Holder agrees, upon exercise or

  

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conversion following the Merger, if required by Calix, to enter into a supplemental agreement with Calix and the stockholders party to the Calix Investor Rights Agreement (subject to the
limitations set forth in this Section 3.3) agreeing to be bound by the terms of such agreement. 
 3.4 Market Standoff
Agreement. Following the completion of the Merger, in connection with the initial public offering of Calix’s securities and upon request of Calix or the underwriters managing such underwritten offering of Calix’s securities, Holder
agrees not to sell, make any short sale of, loan, grant any option for the purchase of, or otherwise dispose of any securities of Calix (other than those included in the registration) without the prior written consent of Calix or any such
underwriters, as the case may be, for such period of time (not to exceed 180 days but subject to such extension or extensions as may be required by the underwriters in order to publish research reports while complying with the Rule 2711 of the
National Association of Securities Dealers Inc.) from the effective date of such registration as may be requested by Calix or such managing underwriters and to execute an agreement reflecting the foregoing as may be requested by the underwriters.

 3.5 Reporting; Accounting. So long as Holder holds the Warrant and/or the Warrant Stock, the Company will deliver to
Holder such reports as it provides to any of its preferred stockholders, as and when delivered to such stockholders. The Company shall not treat the Warrant or the Warrant Stock as having been granted or issued as property transferred in connection
with the performance of services or otherwise as compensation for services rendered. 
 3.6 Stockholder Agreement. Holder
acknowledges receipt of a copy of that certain Fourth Amended and Restated Stockholders Agreement dated as of July 8, 2003, among the Company and the stockholders named therein (as amended from time to time, the “Stockholders
Agreement”). Holder and the Company agree that upon the purchase of Warrant Stock upon exercise or conversion pursuant to this Warrant, said Warrant Stock shall be subject to the terms of the Stockholders Agreement (including without
limitation, certain transfer and voting restrictions) and the Holder shall be bound by, and receive the benefit of, the terms of the Stockholders Agreement in the same manner as the other stockholders that have entered into such Agreement. The
Holder agrees, upon such exercise or conversion, if required by the Company, to enter into a supplemental agreement with the Company and the stockholders party to the Stockholders Agreement agreeing to be bound by and receive the benefit of such
terms of the Stockholders Agreement. For the avoidance of doubt, however, until such time as this Warrant is exercised or converted, Holder’s rights and obligations (including without limitation, as to transfer), shall be governed solely by
this Warrant. The provisions set forth for the Stockholders Agreement relating to the above in effect as of the Issue Date may not be amended, modified or waived, without the prior written consent of Holder unless such amendment, modification or
waiver affects the rights associated with the Warrant Stock in exactly the same manner as such amendment, modification or waiver affects the rights associated with all other shares of the same series and class as the Warrant Stock. Holder hereby
acknowledges and agrees that, upon the consummation of the Merger, this Section 3.6 shall be null and void and Holder shall, instead, upon the exercise of this Warrant, become party to Calix’s Stockholder’s Agreement to be dated as of
the date of the Merger (the “Calix Stockholder Agreement”) and, subject to the limitations set forth in Section 3.3 above with respect to the Calix Investor’s Rights Agreement, the Preferred Stock Agreements to be dated as of the
date of the Merger and that such Calix Series H Preferred Stock issuable upon exercise of this Warrant shall have the rights,

  

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preferences and privileges set forth in Calix’s Tenth Amended and Restated Certificate of Incorporation. The Holder agrees, upon exercise or conversion following the Merger, if required by
Calix, to enter into a supplemental agreement with Calix and the stockholders party to the Calix Stockholder Agreement and the Preferred Stock Agreements (subject to the limitations set forth in Section 3.3 above) agreeing to be bound by the
terms of such agreements. 
 3.7 Effect of Assumption of Warrant. The Company represents to Holder and Holder
acknowledges that this Warrant is to be assumed by Calix pursuant to the Merger Agreement. The Holder acknowledges and agrees that, upon the consummation of the Merger, any references herein to (i) the Company shall automatically be deemed to
be substituted by reference to Calix, (ii) the Company’s Registration Rights Agreement shall be deemed to be substituted by reference to the Calix Investor Rights Agreement, subject to the limitations set forth in Section 3.3,
(iii) the Stockholders Agreement shall be deemed to be substituted by reference, as applicable, to the Stockholders Agreement and the Preferred Stock Agreements (subject to the limitations set forth in Section 3.3 above) and subject to all
limitations contained therein, and (iv) the Certificate of Incorporation or charter documents, as the case may be, shall automatically be deemed to be substituted by references to Calix’s Tenth Amended and Restated Certificate of
Incorporation, in each case as have been and may be amended from time to time. The Holder further acknowledges and agrees that, upon assumption by Calix, this Warrant shall become exercisable for that number of shares of Calix Series H Preferred
Stock it would have received had it exercised this Warrant immediately prior to the consummation of the Merger. 
 Section 4. Adjustments.

 4.1 Adjustments. In order to prevent dilution of the rights granted hereunder, the Exercise Price shall be subject
to adjustment from time to time in accordance with this Section 4. 
 4.2 Subdivisions, Combinations and Stock
Dividends. If the Company declares or pays a dividend on the Warrant Stock payable in Warrant Stock, Common Stock or other securities, then upon exercise of this Warrant, for each share of Warrant Stock acquired, Holder shall receive, without
cost to Holder, the total number and kind of securities to which Holder would have been entitled had Holder owned the Warrant Stock of record as of the date the dividend occurred. If the Company subdivides the Warrant Stock by reclassification or
otherwise into a greater number of shares or takes any other action which increase the amount of stock into which the Warrant Stock is convertible, the number of shares purchasable hereunder shall be proportionately increased and the Exercise Price
shall be proportionately decreased. If the outstanding shares are combined or consolidated, by reclassification or otherwise, into a lesser number of shares, the Exercise Price shall be proportionately increased and the number of shares of Warrant
Stock shall be proportionately decreased. 
 4.3 Reclassification, Exchange, Combinations, Substitutions, Etc. Upon any
reclassification, exchange, substitution, or other event that results in a change of the number and/or class of the securities issuable upon exercise or conversion of this Warrant, Holder shall be entitled to receive, upon exercise or conversion of
this Warrant, the number and kind of securities and property that Holder would have received for the Warrant Stock if this Warrant had been exercised immediately before such reclassification, exchange, substitution, or other event. Such an event
shall include any automatic conversion of the outstanding or issuable

  

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securities of the Company of the same class or series as the Warrant Stock to Common Stock pursuant to the terms of the Company’s Certificate of Incorporation and Certificate of Designation,
each as amended, upon (a) the closing of a registered public offering of the Common Stock or (b) any other event contemplated in Section 6A(ii) of the Company’s Certificate of Designation of Preferences of its Preferred Stock
filed with the Delaware Secretary of State on August 14, 2003, as amended from time to time (the “Certificate of Designation”). The Company or its successor shall promptly issue to Holder an amendment to this Warrant setting forth the
number and kind of such new securities or other property issuable upon exercise or conversion of this Warrant as a result of such reclassification, exchange, substitution or other event that results in a change of the number and/or class of
securities issuable upon exercise or conversion of this Warrant. The amendment to this Warrant shall provide for adjustments (as determined in good faith by the Company’s Board of Directors) which shall be as nearly equivalent as may be
practicable to the adjustments provided for in this Article 4 including, without limitation, adjustments to the Warrant Price and to the number of securities or property issuable upon exercise of the new Warrant. The provisions of this Article 4.3
shall similarly apply to successive reclassifications, exchanges, substitutions, or other events. 
 4.4 Notice of Certain
Events. In the event that the Company shall: 
 (a) declare or propose to declare any dividend upon its capital stock,
whether payable in cash, property, stock or other securities and whether or not a regular cash dividend; or 
 (b) offer for
sale any additional shares of any class or series of the Company’s capital stock or securities exchangeable for or convertible into such capital stock, other than offers described in Section 6C(viii) of the Company’s Certificate of
Designation; or 
 (c) effect or approve any reclassification or recapitalization of the capital stock of the Company, including
any reorganization, subdivision or combination of its outstanding capital stock, or consolidation or merger of the Company with, or sale of all or substantially all of its assets to, another corporation, or to liquidate, dissolve or wind up
(including an assignment for the benefit of creditors), or 
 (d) any voluntary dissolution, liquidation or winding up of the
Company, or 
 (e) offer holders of registration rights the opportunity to participate in any public offering of the
Company’s securities,  
 then, in connection with such event, the Company shall give to Holder: 
 (i) at least ten (10) days prior written notice of the date on which the books of the Company shall close or a record
shall be taken for such a dividend or offer in respect of the matters referred to in (a) or (b) above, or for determining rights to vote in respect of the matters referred to in (c) above; and 
 (ii) in the case of the matters referred to in (d) above, at least ten (10) days prior written notice of the date
when the same shall take place. Such notice in accordance with the foregoing clause (a) shall also specify, in the case of any such dividend, the date on which the holders of capital stock shall be entitled thereto and the

  

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terms of such dividend, and such notice in accordance with the foregoing clause (b) shall also specify the date on which the holders of capital stock shall be entitled to exchange their
capital stock for securities or other property deliverable upon such reorganization, reclassification, exchange, substitution, consolidation, merger or sale, as the case may be, and the terms of such exchange, or such liquidation, dissolution or
winding up. Each such written notice shall be given as set forth in Section 7; and 
 (iii) in the case of
the matter referred to in (e) above, the same notice as is given or required to be given to the holders of such registration rights. 
 4.5 Antidilution Provisions. Upon the closing of the proposed Merger, the antidilution rights previously described in this section shall be replaced with the antidilution rights described in
Calix’s Tenth Amended and Restated Certificate of Incorporation. If the Merger does not occur, the antidilution rights previously described in this section shall remain in full force and effect. 
 4.6 Officers’ Statement as to Adjustments. Whenever the Exercise Price and/or number of shares of Series III Stock subject to
the Warrant is required to be adjusted as provided in Section 4, the Company shall forthwith file at each office designated for the exercise of this Warrant a statement, signed by the Chief Executive Officer or Chief Financial Officer of the
Company, showing in reasonable detail the facts requiring such adjustment, the Exercise Price and number of Warrant Stock (or other securities) that will be effective after such adjustment; provided, however, such statement shall not be required to
the extent detailed information demonstrating such adjustment is available through the Company’s reports filed with the Securities and Exchange Commission. The Company shall also cause a notice setting forth any such adjustments to be sent by
mail, first-class, postage prepaid, to the record Holder of this Warrant at its address appearing herein or otherwise on the stock register. If such notice relates to an adjustment resulting from an event referred to in Section 4.3, such notice
shall be included as part of the notice required to be mailed and published under the provisions of Section 4.4. 
 4.7
Issue of Securities other than Series III Stock. In the event that at any time, as a result of any adjustment made pursuant to Section 4, Holder thereafter shall become entitled to receive any shares of the Company, other than Series III
Stock, thereafter the number of such other shares so receivable upon exercise of this Warrant shall be subject to adjustment from time to time in a manner and on terms as nearly equivalent as practicable to the provisions with respect to the Series
III Stock contained in Section 4. 
 Section 5. Rights and Obligations of the Warrant Holder. 
 Except to the extent otherwise specified in this Warrant, this Warrant, until exercised, shall not entitle Holder to any rights of a
stockholder in the Company. 
 Section 6. Restrictive Stock Legend. 
 This Warrant and the Warrant Stock have not been registered under any securities laws. Accordingly, any stock certificates issued pursuant to
the exercise of this Warrant shall (until receipt of an opinion of counsel that such legend is no longer necessary) bear substantially the following legend: 
  

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 THIS WARRANT AND THE WARRANT STOCK ISSUABLE UPON EXERCISE HEREOF HAVE NOT BEEN REGISTERED
UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE “SECURITIES ACT”), AND HAVE BEEN ACQUIRED FOR INVESTMENT AND NOT WITH A VIEW TO, OR IN CONNECTION WITH, THE SALE OR DISTRIBUTION THEREOF. NO SUCH SALE OR DISTRIBUTION MAY BE EFFECTED
WITHOUT AN EFFECTIVE REGISTRATION STATEMENT RELATED THERETO OR AN OPINION OF COUNSEL IN A CUSTOMARY FORM THAT SUCH REGISTRATION IS NOT REQUIRED UNDER THE SECURITIES ACT. 
 Section 7. Notices. 
 Any notice or other communication required or
permitted to be given here shall be in writing and shall be effective (a) upon hand delivery or delivery by e-mail or facsimile at the address or number designated below (if delivered on a business day during normal business hours where such
notice is to be received) or the first business day following such delivery (if delivered other than on a business day during normal business hours where such notice is to be received), or (b) on the third business day following the date of
mailing by express courier service or first class mail, fully prepaid, addressed to such address, or upon actual receipt of such mailing, whichever shall first occur. The addresses for such communication shall be: 
 If to the Company: 
 Optical Solutions, Inc. 
 16305 36th Ave. N., Suite 300 
 Minneapolis, MN 55446 
 Attention: Director of Finance 
  
  
  
 with a copy to: 
 Faegre & Benson LLP 
 2200 Wells Fargo Center 
 90 South Seventh Street 
 Minneapolis, MN 55402 
 Attention: Andrew G. Humphrey 
  
  
  
 If to Holder: 
 Partners for Growth, L.P. 
  

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 180 Pacific Avenue 
 San Francisco, CA 94111 
 Attention: Lorraine Nield 
  
  
 with a copy to: 
 Benjamin Greenspan, Esq. 
 620 Laguna Road 
 Mill Valley, CA 94941 
  
  
  
 Each party
hereto may from time to time change its address for notices under this Section 7 by giving notice of such changes pursuant to the procedures set forth in this Section 7. 
 Section 8. Amendments and Waivers. 
 This Warrant and any term hereof may be
changed, waived, discharged or terminated only by an instrument in writing signed by the party against which enforcement of such change, waiver, discharge or termination is sought. 
 Section 9. Termination of Existing Warrant. 
 Effective as of the date the
Merger is consummated, the Company and the Holder agree that the Existing Warrant is hereby terminated and all rights and obligations of the parties thereunder are hereby terminated. If the Merger is not consummated, the rights and obligations of
the Company and the Holder shall be determined under the Existing Warrant. 
 Section 10. Applicable Law. 
 This Warrant shall be governed by and construed and enforced in accordance with the laws of the State of Delaware, without regard to its
conflict of laws provisions. 
 Section 11. Construction. 
 The terms of the Warrant Purchase Agreement to which this Warrant is attached as Exhibit 1 are incorporated by reference herein. Terms used but not defined herein have the meaning set forth in the Warrant
Purchase Agreement. 
 [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK] 
  

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 IN WITNESS WHEREOF, the Company has caused this Warrant to be duly executed January 30,
2006. 
  

			
	COMPANY:
	
	Optical Solutions, Inc.
		
	By:	 	/s/ Michel A. Dagenais
	Name:	 	Michel A. Dagenais
	Title:	 	Chief Executive Officer
	
	HOLDER:
	
	Partners for Growth, L.P.
		
	By:	 	/s/ Lorraine Nield
		 	Lorraine Nield, Manager of
Partners for Growth, LLC,
Its General Partner

  

 13 








 Exhibit A 
  

	To:	Optical Solutions, Inc. 

 ELECTION TO EXERCISE 
  

	1.	The undersigned hereby exercises its right to subscribe for and purchase
                                     fully paid, validly
issued and nonassessable shares of Series III Stock covered by the attached Warrant and tenders payment herewith in the amount of $             in accordance with the terms thereof,


  

	1.	The undersigned hereby elects to convert the attached Warrant into fully paid, validly issued and nonassessable shares of Series III Stock by Cashless Exercise in the
manner specified in Section 1.3 of the attached Warrant. This conversion is exercised with respect to
                                        
of shares, 

 [Strike the paragraph above that does not apply.] 
 and requests that certificates for such shares be issued in the name of, and delivered to: 
 ___________________________________________________ 
 ___________________________________________________ 
 ___________________________________________________ 
 ___________________________________________________ 

Date: __________________ 
  

			
	Holder:
		
	By:	 	 
		
	Name:	 	 
		
	Title:	 	 


  

 14 








 Exhibit B 
 ASSIGNMENT FORM 
  

	To:	Optical Solutions, Inc. 

 The
undersigned hereby assigns and transfers this Warrant to: 
 ___________________________________________________________________________________________________ 
 (Insert
assignee’s social security or tax identification number) 
 ___________________________________________________________________________________________________ 
 (Print or type
assignee’s name, address and postal code) 
 ___________________________________________________________________________________________________ 
 ___________________________________________________________________________________________________ 
 and irrevocably appoints
                                     to transfer this Warrant
on the books of the Company. 
 Date: __________________ 
  

			
	Assignor:
		
	By:	 	 
		
	Name:	 	 
		
	Title:	 	 


  

 15