EX-10.6.9



 Exhibit 10.6.9 

GRANT OF SECURITY INTEREST 

PATENTS 
 THIS GRANT OF
SECURITY INTEREST, dated as of May 10, 2011, is executed by XTERA COMMUNICATIONS, INC., a Delaware corporation with an address of 500 W. Bethany Drive, Suite 100 Allen, Texas 75013 (“Debtor”), in favor of HORIZON TECHNOLOGY
FINANCE CORPORATION, a Delaware corporation with an address of 312 Farmington Avenue, Farmington, Connecticut 06032 (“Secured Party”). 

A. Pursuant to a certain Venture Loan and Security Agreement dated on or about the date hereof (the “Agreement”) by and
between Debtor and the Secured Party, the Secured Party has agreed to extend credit to Debtor upon the terms and subject to the conditions set forth therein; 

B. Debtor owns the patents and/or applications for patents, more particularly described on Schedules 1-A and 1-B annexed hereto as part
hereof (collectively, the “Patents”); 
 C. Pursuant to the Agreement, Debtor has granted to Secured Party a security
interest in all right, title and interest of Debtor in and to the Patents, together with any reissue, continuation, continuation-in-part or extension thereof, and all proceeds thereof, including any and all causes of action which may exist by reason
of infringement thereof for the full term of the Patents (the “Collateral”), to secure the prompt payment, performance and observance of the Obligations (as defined in the Agreement); 

NOW, THEREFORE, for good and valuable consideration, receipt of which is hereby acknowledged, Debtor does hereby further grant to Secured
Party a security interest in the Collateral to secure the prompt payment, performance and observance of the Obligations. 
 Debtor does
hereby further acknowledge and affirm that the rights and remedies of Secured Party with respect to the security interest in the Collateral granted hereby are more fully set forth in the Agreement, the terms and provisions of which are hereby
incorporated herein by reference as if fully set forth herein. 
 IN WITNESS WHEREOF, Debtor has caused this instrument to be executed as of
the day and year first written above. 
  

			
	XTERA COMMUNICATIONS, INC.
		
	By:	 	/s/ Paul Colan
		 	Paul Colan
		 	Chief Financial Officer









 SCHEDULE 1-A TO GRANT OF SECURITY INTEREST 

PATENTS 
  

							
	Patent	  	Owner	  	Registration Number	  	Registration Date
				
	 Control of Raman amplifiers
 through pump
power
 adjustment
	  	Debtor	  	US 6,807,197	  	October 19, 2004
				
	 Splice in PM fiber in order
 to depolarize pump
light
	  	 The Regents of

the University
 of Michigan
	  	US 6,052,393	  	April 18, 2000
				
	 Splice in PM fiber in order
 to depolarize pump
light
	  	Debtor	  	US 6,370,164	  	April 9, 2002
				
	 Splice in PM fiber in order
 to depolarize pump
light
	  	Debtor	  	US 6,833,946	  	December 21, 2004
				
	 Bidirectionally pumped
 Raman
amplifiers
	  	Debtor	  	US 6,714,342	  	March 30, 2004
				
	 Bidirectionally pumped
 Raman
amplifiers
	  	Debtor	  	US 6,631,025	  	October 7, 2003
				
	Raman amplification	  	Debtor	  	US 6,101,024	  	August 8, 2000
				
	Raman amplification	  	Debtor	  	US 6,239,902	  	May 29, 2001
				
		  	 The Regents of

the University of
 Michigan
	  		  	
				
	 Ultra long span
 unrepeatered Raman

systems
	  	Debtor	  	US 7,885,550	  	February 8, 2011
				
	 Ultra long span
 unrepeatered Raman

systems
	  	Debtor	  	US 7,567,593	  	July 28, 2009








 SCHEDULE 1-B TO GRANT OF SECURITY INTEREST 

PATENT APPLICATIONS 
  

							
	Patent Application	 	Owner	 	Application Number	  	Application Date