Document:

EX-4.5

 Exhibit 4.5 

THIS WARRANT AND THE SECURITIES ISSUABLE HEREUNDER HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED, AND MAY NOT BE OFFERED FOR SALE,
SOLD, OR OTHERWISE TRANSFERRED OR ASSIGNED FOR VALUE, DIRECTLY OR INDIRECTLY, NOR MAY THIS WARRANT OR THE SECURITIES ISSUABLE UPON EXERCISE OF THIS WARRANT BE TRANSFERRED ON THE BOOKS OF THE COMPANY, WITHOUT REGISTRATION OF SUCH WARRANT OR
SECURITIES, AS APPLICABLE, UNDER ALL APPLICABLE UNITED STATES FEDERAL OR STATE SECURITIES LAWS OR COMPLIANCE WITH AN APPLICABLE EXEMPTION THEREFROM, SUCH COMPLIANCE, AT THE OPTION OF THE COMPANY, TO BE EVIDENCED BY AN OPINION OF THE HOLDER’S
COUNSEL, IN A FORM ACCEPTABLE TO THE COMPANY, THAT NO VIOLATION OF SUCH REGISTRATION PROVISIONS WOULD RESULT FROM ANY PROPOSED TRANSFER OR ASSIGNMENT. 

WARRANT TO PURCHASE STOCK 
  

			
	Corporation:	  	XTERA COMMUNICATIONS, INC.
	Number of Shares:	  	769,231 Shares
	Class of Stock:	  	Series D-3 Preferred
	Initial Exercise Price:	  	$0.65 per share
	Issue Date:	  	January 16, 2015
	Expiration Date:	  	January 16, 2025

 THIS WARRANT CERTIFIES
THAT, for good and valuable consideration, the receipt of which is hereby acknowledged, SQUARE 1 BANK or its assignee (“Holder”) is entitled to purchase the number of fully paid
and nonassessable shares of the class of securities (the “Shares”) of the corporation (the “Company”) at the initial exercise price per Share (the “Warrant Price”) all as set
forth above and as adjusted pursuant to Article 2 of this warrant, subject to the provisions and upon the terms and conditions set forth in this warrant. 

ARTICLE 1 
 EXERCISE

 1.1 Method of Exercise. Holder may exercise this warrant by delivering this warrant and a duly executed Notice of Exercise in
substantially the form attached as Appendix 1 to the principal office of the Company. Unless Holder is exercising the conversion right set forth in Section 1.2, Holder shall also deliver to the Company a check for the aggregate Warrant Price
for the Shares being purchased. 
 1.2 Conversion Right. In lieu of exercising this warrant as specified in Section 1.1, holder
hereof shall have the right to convert this Warrant, in whole or in part, into Shares by executing and delivering to the Company at its principal office the written Notice of Exercise in the form attached hereto as Appendix 1, specifying the
portion of the Warrant to be converted, and accompanied by this Warrant. The number of Shares to be issued to the holder upon such conversion shall be computed using the following formula: 

X = (P)(Y)(A-B)/A 
 where 

 

					
	X	 	=	  	the number of Shares to be issued to the holder for the portion of the Warrant being converted.
	P	 	=	  	the portion of the Warrant being converted expressed as a decimal fraction.
	Y	 	=	  	the total number of Shares issuable upon exercise of the Warrant in full.
	A	 	=	  	the fair market value (as determined in Section 1.3 below).
	B	 	=	  	the Warrant Price on the date of conversion.

 Any portion of this Warrant that is converted shall be immediately canceled. This Warrant or any portion hereof
shall be deemed to have been converted immediately prior to the close of business on the date of its surrender for conversion as provided above, and the person entitled to receive the Shares issuable upon such conversion shall be treated for all
purposes as holder of such shares of record as of the close of business on such date. This Warrant shall continue in full force and effect as to any portion that is not converted pursuant hereto. 

1.3 Fair Market Value. If the Shares are traded regularly in a public market, the fair market value of the Shares shall be the closing
price of the Shares (or the closing price of the Company’s stock into which the Shares are convertible) reported for the business day immediately before Holder delivers its Notice of Exercise to the Company. If the Shares are not regularly
traded in a public market, the Board of Directors of the Company shall determine fair market value in its reasonable good faith judgment. 

1.4 Delivery of Certificate and New Warrant. Promptly after Holder exercises or converts this warrant, the Company shall deliver to
Holder certificates for the Shares acquired and, if this warrant has not been fully exercised or converted and has not expired, a new warrant representing the Shares not so acquired. 

1.5 Replacement of Warrants. On receipt of evidence reasonably satisfactory to the Company of the loss, theft, destruction or
mutilation of this warrant and, in the case of loss, theft or destruction, on delivery of an indemnity agreement reasonably satisfactory in form and amount to the Company or, in the case of mutilation, on surrender and cancellation of this warrant,
the Company at its expense shall execute and deliver, in lieu of this warrant, a new warrant of like tenor. 
 1.6 Treatment of Warrant
Upon Acquisition of Company. For the purpose of this Warrant, “Acquisition” means any transaction or series of related transactions involving: (i) the sale, lease, exclusive license or other disposition of all or
substantially all of the assets of the Company; or (ii) any merger or consolidation of the Company into or with another person or entity (other than a merger or consolidation effected exclusively to change the Company’s domicile), or any
other corporate reorganization, in which the stockholders of the Company in their capacity as such immediately prior to such merger, consolidation or reorganization, own less than a majority of the Company’s (or the surviving or successor
entity’s) outstanding voting power immediately after such merger, consolidation or reorganization. 

  
 2. 

 1.6.1 In the event of an Acquisition in which the consideration to be received by the
Company’s stockholders consists solely of cash, solely of Marketable Securities (as defined below) or a combination of cash and Marketable Securities (a “Cash/Public Acquisition”), then, if the fair market value of one Share
would be greater than the Warrant Price in effect on such date, this Warrant shall be deemed to have been automatically exercised on the record date for such an Acquisition in accordance with Section 1.2 hereof, and thereafter the Holder shall
participate in the Acquisition as a holder of the Shares on the same terms as other holders of the same class of securities of the Company, and the Company shall promptly notify the Holder of the number of shares (or such other securities) issued
upon such exercise to the Holder and Holder shall be deemed to have restated each of the representations and warranties in Section 3.2 of the Warrant as the date thereof; provided that if the Acquisition does not close, then this Warrant shall
not be deemed to have been exercised and this Warrant shall continue in full force and effect. 
 1.6.2 The Company shall provide
Holder with written notice of a Cash/Public Acquisition (together with such reasonable information as Holder may reasonably require regarding the treatment of this Warrant in connection with such contemplated Cash/Public Acquisition giving rise to
such notice), which is to be delivered to Holder not less than five (5) business days prior to the closing of the proposed Cash/Public Acquisition. 

1.6.3 Upon the closing of any Acquisition other than a Cash/Public Acquisition defined above, the acquiring, surviving or successor
entity shall assume the obligations of this Warrant, and this Warrant shall thereafter be exercisable for the same securities and/or other property as would have been paid for the Shares issuable upon exercise of the unexercised portion of this
Warrant as if such Shares were outstanding on and as of the closing of such Acquisition, subject to further adjustment from time to time in accordance with the provisions of this Warrant. 

1.6.4 As used in this Warrant, “Marketable Securities” means securities meeting all of the following requirements:
(i) the issuer thereof is then subject to the reporting requirements of Section 13 or Section 15(d) of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), and is then current in its filing of all
required reports and other information under the Act and the Exchange Act; (ii) the class and series of shares or other security of the issuer that would be received by Holder in connection with the Acquisition were Holder to exercise this
Warrant on or prior to the closing thereof is then traded on a nationally recognized securities exchange, inter-dealer quotation system or over-the-counter market, and (iii) following the closing of such Acquisition, Holder would not be
restricted from publicly reselling all of the issuer’s shares and/or other securities that would be received by Holder in such Acquisition were Holder to exercise or convert this Warrant in full on or prior to the closing of such Acquisition,
except to the extent that any such restriction (x) arises solely under federal or state securities laws, rules or regulations, and (y) does not extend beyond six (6) months from the closing of such Acquisition. 

  
 3. 

 ARTICLE 2 

ADJUSTMENTS TO THE SHARES 

2.1 Stock Dividends, Splits, Etc. If the Company declares or pays a dividend on its common stock payable in common stock, or other
securities, or subdivides the outstanding common stock into a greater amount of common stock, then upon exercise of this warrant, for each Share 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 Shares of record as of the date the dividend or subdivision occurred. 
 2.2
Reclassification, Exchange or Substitution. 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 Shares 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 securities of the Company of the same class or series as the Shares to common stock pursuant to the terms of the
Company’s Articles of Incorporation upon the closing of a registered public offering of the Company’s common stock. The Company or its successor shall promptly issue to Holder a new warrant for such new securities or other property. The
new warrant shall provide for adjustments which shall be as nearly equivalent as may be practicable to the adjustments provided for in this Article 2 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 Section 2.2 shall similarly apply to successive reclassifications, exchanges, substitutions, or other events. 

2.3 Adjustments for Combinations, Etc. If the outstanding Shares are combined or consolidated, by reclassification or otherwise, into a
lesser number of shares, the Warrant Price shall be proportionately increased. If the outstanding Shares are combined or consolidated, by reclassification or otherwise, into a greater number of shares, the Warrant Price shall be proportionately
decreased. 
 2.4 Adjustments for Diluting Issuances. In the event of the issuance (a “Diluting Issuance”) by
the Company after the Issue Date of securities at a price per share less than the Warrant Price, then the number of shares of common stock issuable upon conversion of the Shares shall be adjusted in accordance with those provisions of the
Company’s Amended and Restated Certificate of Incorporation (the “Restated Certificate”) that apply to Diluting Issuances. 

2.5 Conversion of Preferred Stock. In the event that all outstanding shares of the Company’s Series D-3 Preferred Stock are
converted, automatically or by action of the holders thereof, into common stock pursuant to the provisions of the Company’s Restated Certificate, including, without limitation, in connection with the Company’s initial, underwritten public
offering and sale of its common stock pursuant to an effective registration statement under the Act (the “IPO”), then from and after the date on which all outstanding shares of the Series D-3 Preferred Stock have been so
converted, this Warrant shall be exercisable for such number of 

  
 4. 

 
shares of common stock into which the Shares would have been converted had the Shares been outstanding on the date of such conversion, and the Warrant Price shall equal the Warrant Price in
effect as of immediately prior to such conversion divided by the number of shares of common stock into which one Share would have been converted, all subject to further adjustment thereafter from time to time in accordance with the provisions of
this Warrant. 
 2.6 Certificate as to Adjustments. Upon each adjustment of the Warrant Price, the Company at its expense shall
promptly compute such adjustment, and furnish Holder with a certificate of its Chief Financial Officer setting forth such adjustment and the facts upon which such adjustment is based. The Company shall, upon written request, furnish Holder a
certificate setting forth the Warrant Price in effect upon the date thereof and the series of adjustments leading to such Warrant Price. 

2.7 Fractional Shares. No fractional Shares shall be issuable upon exercise or conversion of the Warrant and the Number of Shares to be
issued shall be rounded down to the nearest whole Share. If a fractional share interest arises upon any exercise or conversion of the Warrant, the Company shall eliminate such fractional share interest by paying Holder amount computed by multiplying
the fractional interest by the fair market value of a full Share. 
 ARTICLE 3 

REPRESENTATIONS AND COVENANTS 

3.1 Company Representations and Warranties. The Company hereby represents and warrants to the Holder as follows: 

(a) The initial Warrant Price referenced on the first page of this warrant is not greater than the price paid for 16,345,722 Shares
sold in the last sale thereof by the Company, (except for 36,163,597 Shares which were sold at a purchase price of $0.52 per Share). 

(b) All Shares which may be issued upon the exercise of the purchase right represented by this warrant, and all securities, if any,
issuable upon conversion of the Shares, shall, upon issuance, be duly authorized, validly issued, fully paid and nonassessable, and free of any liens and encumbrances except for restrictions on transfer provided for herein or under applicable
federal and state securities laws. 
 (c) The Company’s capitalization table attached to this warrant as Appendix 2 is true and
complete as of the Issue Date. 
 3.2 Holder Representations and Warranties. The Holder represents and warrants to the Company: 

(a) The Holder is an “Accredited Investor” as that term is defined in Rule 501 of Regulation D promulgated under the
Securities Act. 
 (b) The Holder has the full right, power and authority to enter into and perform the Holder’s obligations
under this Warrant, and this Warrant constitutes a valid and binding obligation of the Holder, enforceable in accordance with its terms except as limited by 

  
 5. 

 
applicable bankruptcy, insolvency, reorganization, moratorium or other laws of general application relating to or affecting enforcement of creditors’ rights and rules or laws concerning
equitable remedies 
 3.3 Notice of Certain Events. The Company shall provide Holder with not less than 10 days prior written notice,
including a description of the material facts surrounding, any of the following events: (a) declaration of any dividend or distribution upon its common stock, whether in cash, property, stock, or other securities and whether or not a regular
cash dividend; (b) effecting any reclassification or recapitalization of common stock; or (c) the merger or consolidation with or into any other corporation, or sale, lease, license, or conveyance of all or substantially all of its assets,
or liquidation, dissolution or winding up. 
 3.4 Information Rights. So long as the Holder holds this warrant and/or any of the
Shares, the Company shall deliver to the Holder (a) promptly after mailing, copies of all communiques to the shareholders of the Company, (b) within one hundred eighty (180) days after the end of each fiscal year of the Company, the
annual audited financial statements of the Company certified by independent public accountants of recognized standing and (c) within forty-five (45) days after the end of each of the first three quarters of each fiscal year, the
Company’s quarterly, unaudited financial statements. 
 3.5 Registration Under Securities Act of 1933, as amended. The Company
agrees that the Shares or, if the Shares are convertible into common stock of the Company, such common stock, shall be “Registrable Securities”, and Holder shall be a “Holder” under the Second Amended and Restated Investor Rights
Agreement, as amended, among the Company and other persons dated as of August 1, 2007. 
 ARTICLE 4 

MISCELLANEOUS 
 4.1
Term: Exercise Upon Expiration. This warrant is exercisable in whole or in part, at any time and from time to time on or before the Expiration Date set forth above; provided, however, that if the Company completes its initial public offering
within the three-year period immediately prior to the Expiration Date, the Expiration Date shall automatically be extended until the third anniversary of the effective date of the Company’s initial public offering. If this warrant has not been
exercised prior to the Expiration Date, this warrant shall be deemed to have been automatically exercised on the Expiration Date by “cashless” conversion pursuant to Section 1.2. 

4.2 Legends. This warrant and the Shares (and the securities issuable, directly or indirectly, upon conversion of the Shares, if any)
shall be imprinted with a legend in substantially the following form: 
 THE SECURITIES REPRESENTED BY THIS CERTIFICATE HAVE NOT BEEN REGISTERED UNDER
UNITED STATES FEDERAL OR STATE SECURITIES LAWS AND MAY NOT BE OFFERED FOR SALE, SOLD, OR OTHERWISE TRANSFERRED OR ASSIGNED FOR VALUE, DIRECTLY OR INDIRECTLY, NOR MAY THE SECURITIES BE 

  
 6. 

 
TRANSFERRED ON THE BOOKS OF THE COMPANY, WITHOUT REGISTRATION OF SUCH SHARES UNDER ALL APPLICABLE UNITED STATES FEDERAL OR STATE SECURITIES LAWS OR COMPLIANCE WITH AN APPLICABLE EXEMPTION
THEREFROM, SUCH COMPLIANCE, AT THE OPTION OF THE COMPANY, TO BE EVIDENCED BY AN OPINION OF HOLDER’S COUNSEL, IN A FORM ACCEPTABLE TO THE COMPANY, THAT NO VIOLATION OF SUCH REGISTRATION PROVISIONS WOULD RESULT FROM ANY PROPOSED TRANSFER OR
ASSIGNMENT. 
 4.3 Compliance with Securities Laws on Transfer. This warrant and the Shares issuable upon exercise of this warrant
(and the securities issuable, directly or indirectly, upon conversion of the Shares, if any) may not be transferred or assigned in whole or in part without compliance with applicable federal and state securities laws by the transferor and the
transferee. The Company shall not require Holder to provide an opinion of counsel 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. 

4.4 Transfer Procedure. Subject to the provisions of Section 4.3, Holder may transfer all or part of this warrant or the Shares
issuable upon exercise of this warrant (or the securities issuable, directly or indirectly, upon conversion of the Shares, if any) by giving the Company notice of the portion of the warrant being transferred setting forth the name, address and
taxpayer identification number of the transferee and surrendering this warrant to the Company for reissuance to the transferee(s) (and Holder, if applicable); provided, however, that Holder may not transfer any part of this warrant or the Shares
issuable upon exercise of this warrant (or the securities issuable, directly or indirectly, upon conversion of the Shares, if any) to any entity which, in the determination of the Company’s Board of Directors, directly or indirectly competes
with the Company. No surrender or reissuance shall be required if the transfer is to an affiliate of Holder. 
 4.5 Notices. All
notices and other communications from the Company to the Holder, or vice versa, shall be deemed delivered and effective when given personally or mailed by first-class registered or certified mail, postage prepaid, at such address as may have been
furnished to the Company or the Holder, as the case may be, in writing by the Company or such Holder from time to time. All notices to the Holder shall be addressed as follows: 

Square 1 Bank 
 Attn: Warrant
Administrator 
 406 Blackwell Street, Suite 240 

Crowe Building 
 Durham, NC 27701

 4.6 Amendments. 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. 

  
 7. 

 4.7 Attorneys’ Fees. In the event of any dispute between the parties concerning the
terms and provisions of this warrant, the party prevailing in such dispute shall be entitled to collect from the other party all costs incurred in such dispute, including reasonable attorneys’ fees. 

4.8 Governing Law. This warrant shall be governed by and construed in accordance with the laws of the State of Delaware, without giving
effect to its principles regarding conflicts of law. 
 [Signature Page Follows] 

  
 8. 

 IN WITNESS WHEREOF, the undersigned has executed this Warrant to Purchase Stock as of the date set forth above.

  

			
	XTERA COMMUNICATIONS, INC.
		
	By:	 	 /s/ Jack Owen

	Name:	 	 Jack Owen

	Title:	 	 Secretary

 [Signature Page to Warrant to Purchase Stock] 

 APPENDIX 1 

NOTICE OF EXERCISE 
 1.
The undersigned hereby elects to purchase                  shares of the stock              of
XTERA COMMUNICATIONS, INC. pursuant to the terms of the attached warrant, and tenders herewith payment of the purchase price of such shares in full. 

1. The undersigned hereby elects to convert the attached warrant into shares in the manner specified in the warrant. This conversion is
exercised with respect to                 of the shares covered by the warrant. 

[Strike paragraph that does not apply.] 

2. Please issue a certificate or certificates representing said shares in the name of the undersigned or in such other name as is
specified below: 
 Square 1 Bank 

Attn: Warrant Administrator 
 406
Blackwell Street, Suite 240 
 Fowler Building 

Durham, NC 27701 
 3. The
undersigned represents it is acquiring the shares solely for its own account and not as a nominee for any other party and not with a view toward the resale or distribution thereof except in compliance with applicable securities laws. 

 

	
	SQUARE 1 BANK or Registered Assignee
	
	  

	(Signature)
	
	  

	(Date)EX-4.6

 Exhibit 4.6 

SECOND AMENDED AND RESTATED SECURED PROMISSORY NOTE 

(Loan A) 
  

			
	$10,000,000.00	 	Originally Dated: May 10, 2011
		
		 	Amended and Restated as of: April 1, 2013
		
		 	Second Amended and Restated as of November 1, 2013

 FOR VALUE RECEIVED, the undersigned, XTERA COMMUNICATIONS, INC., a Delaware corporation
(“Borrower”), HEREBY PROMISES TO PAY to HORIZON FUNDING TRUST 2013-1, as assignee of HORIZON TECHNOLOGY FINANCE CORPORATION, a Delaware corporation (“Lender”) the principal amount of Ten Million and 00/100 Dollars
($10,000,000.00) or such lesser amount as shall equal the outstanding principal balance of the Loan A made to Borrower by Lender pursuant to the Loan Agreement (as defined below), and to pay all other amounts due with respect to the Loan on the
dates and in the amounts set forth in the Loan Agreement. This Note replaces and supersedes, in its entirety, that certain Amended and Restated Secured Promissory Note (Loan A) issued by Borrower to Lender on April 1, 2013 (the
“Original Note”). Nothing contained herein shall be deemed a repayment or novation of the Original Note. 
 Interest on the
principal amount of this Note from the date of this Note shall accrue at the Loan Rate or, if applicable, the Default Rate. The Loan Rate for this Note is 11.50% per annum based on a year of twelve 30-day months. If the Funding Date is not the
first day of the month, interim interest accruing from the Funding Date through the last day of that month shall be paid on the first calendar day of the next calendar month. Commencing July 1, 2011, through and including June 1, 2012, on
the first day of each month (each an “Initial Interest Payment Date”) Borrower shall make payments of accrued interest only on the outstanding principal amount of the Loan in the amount of Ninety-Five Thousand Eight Hundred
Thirty-Three and 33/100 Dollars ($95,833.33). Commencing on July 1, 2012, and continuing on the first day of each month thereafter through March 1, 2013 (each an “Initial Principal and Interest Payment Date”), Borrower
shall make to Lender a payment of principal plus accrued interest on the then outstanding principal amount due hereunder each in the amount of Three Hundred Eighty-Five Thousand One Hundred Twenty-Six and 65/100 Dollars ($385,126.65). Commencing on
April 1, 2013, through and including June 1, 2013 on the first day of each month (each a “Subsequent Interest Payment Date”), Borrower shall make a payment of accrued interest only on the outstanding principal amount of
the Loan in the amount of Sixty-Nine Thousand Nine Hundred Three and 61/100 Dollars ($69,903.61). Commencing on July 1, 2013, through and including September 1, 2013 on the first day of each month (each a “Partial Principal and
Interest Payment Date”), Borrower shall make payments of principal plus accrued interest on the then outstanding principal amount due hereunder in the amount of Two Hundred Twenty-Seven Thousand Five Hundred Fifteen and 13/100 Dollars
($227,515.13). On October 1, 2013 (the “Subsequent Principal and Interest Payment Date”), Borrower shall make to Lender a payment of principal plus accrued interest on the then outstanding principal amount due hereunder each in
the amount of Four Hundred Fourteen Thousand One Hundred Twenty-Seven and 52/100 Dollars ($414,127.52). Commencing on November 1, 2013, through and including February 1, 2014 (each an “Additional Interest Payment Date”),
on the first day of each month, Borrower shall make payments of accrued interest only on the outstanding principal amount of the Loan in the 

 
amount of Sixty-One Thousand Nine Hundred Eighty-Six and 06/100 Dollars ($61,986.06). Commencing as of March 1, 2014, and continuing on the first day of each month thereafter (each, an
“Additional Principal and Interest Payment Date”, and together with the Initial Interest Payment Dates, the Initial Principal and Interest Payment Dates, the Subsequent Interest Payment Dates, the Partial Principal and Interest
Payment Dates, the Subsequent Principal and Interest Payment Date and the Additional Interest Payment Dates, the “Payment Dates”), Borrower shall make to Lender seventeen (17) equal payments of principal plus accrued interest
on the then outstanding principal amount due hereunder each in the amount of Four Hundred Fourteen Thousand One Hundred Twenty-Seven and 52/100 Dollars ($414,127.52). On July 1, 2015, or the earlier repayment in full of the Loan, Borrower shall
make a payment of One Million Four Hundred Sixty-Five Thousand Three Hundred Thirty-Three and 83/100 Dollars ($1,465,333.83) to Lender (the “Final Payment”). If not sooner paid, all outstanding amounts hereunder and under the Loan
Agreement shall become due and payable on July 1, 2015. 
 Principal, interest and all other amounts due with respect to the Loan, are
payable in lawful money of the United States of America to Lender as set forth in the Loan Agreement. The principal amount of this Note and the interest rate applicable thereto, and all payments made with respect thereto, shall be recorded by Lender
and, prior to any transfer hereof, endorsed on the grid attached hereto which is part of this Note. 
 This Note is referred to in, and is
entitled to the benefits of, the Venture Loan and Security Agreement dated May 10, 2011 by and between Borrower and Lender (as amended, the “Loan Agreement”). The Loan Agreement, among other things, (a) provides for the making of
a secured Loan to Borrower, and (b) contains provisions for acceleration of the maturity hereof upon the happening of certain stated events. 

This Note may not be prepaid except as set forth in Section 2.3 of the Loan Agreement. 

This Note and the obligation of Borrower to repay the unpaid principal amount of the Loan, interest on the Loan and all other amounts due
Lender under the Loan Agreement is secured under the Loan Agreement. 
 Presentment for payment, demand, notice of protest and all other
demands and notices of any kind in connection with the execution, delivery, performance and enforcement of this Note are hereby waived. 

Borrower shall pay all reasonable fees and expenses, including, without limitation, reasonable attorneys’ fees and costs, incurred by
Lender in the enforcement or attempt to enforce any of Borrower’s obligations hereunder not performed when due. This Note shall be governed by, and construed and interpreted in accordance with, the laws of the State of Connecticut. 

  
 2 

 IN WITNESS WHEREOF, Borrower has caused this Note to be duly executed by one of its officers
thereunto duly authorized on the date hereof. 
  

			
	BORROWER:
	XTERA COMMUNICATIONS, INC.
		
	By:	 	 /s/ Jon R. Hopper

	Name:	 	Jon R. Hopper
	Title:	 	President & CEO

  
 3

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