Exhibit 24.1

LOGO

POWER OF ATTORNEY

KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature appears below hereby constitutes and appoints Thomas L. Cronan III, Beth Frensilli, and Kyle McElroy, or any one of them, as his or her
attorney-in-fact and agent, with full power of substitution, for him or her in any and all capacities, hereby giving and granting to said attorney-in-fact and agent full power and authority to do and perform all and every act and thing whatsoever
requisite and necessary to be done in and about the premises as fully, to all intents and purposes, as he might or could do if personally present at the doing thereof, hereby ratifying and confirming all that said attorney-in-fact and agent may or
shall lawfully do, or cause to be done, in connection with the proposed filing by Redback Networks Inc., a Delaware corporation, with the Securities and Exchange Commission, under the provisions of the Securities Exchange Act of 1934, as amended, of
an annual report on Form 10-K for the fiscal year ended December 31, 2005, including but not limited to, such full power and authority to do the following: (i) execute and file such annual report; (ii) execute and file any amendment
or amendments thereto; (iii) receive and respond to comments from the Securities and Exchange Commission related in any way to such annual report or any amendment or amendments thereto; and (iv) execute and deliver any and all
certificates, instruments or other documents related to the matters enumerated above, as the attorney-in-fact in his sole discretion deems appropriate.

This power of attorney has been duly executed below by the following persons in the capacities indicated on March 24, 2006.



|                                                             |  |  |  |                                                           
|------------------------------------------------------------ |  |  |  | ----------------------------------------------------------
|Signed:                                                      |  |  |  | Signed:                                                   
|/S/    KEVIN DENUCCIO                                        |  |  |  | /S/    PAUL GIORDANO                                      
|Kevin DeNuccio President and CEO, Redback
Networks Inc.      |  |  |  | Paul Giordano Chairman of the Board,
Redback Networks Inc.
|                                                             |  | 
|Signed:                                                      |  |  |  | Signed:                                                   
|/S/    WILLIAM H. KURTZ                                      |  |  |  | /S/    DAVID C. FRIEZO                                    
|                                                             |  | 
|William H. Kurtz SVP and CFO, Novellus
Systems, Inc.         |  |  |  | David C. Friezo Lydian Asset Management,
LP               
|                                                             |  | 
|Signed:                                                      |  |  |  | Signed;                                                   
|/S/    ROY D. BEHREN                                         |  |  |  | /S/    JOHN DREW                                          
|                                                             |  | 
|Roy D. Behren Westchester Capital
Management                 |  |  |  | John Drew General Partner,
TCV                            
|                                                             |  | 
|Signed:                                                      |  |  |  |                                                           
|/S/    MARTY KAPLAN                                          |  |  |  |                                                           
|                                                             |  | 
|Marty Kaplan Chairman of the Board, JDS
Uniphase Corporation |  |  |  |