EXHIBIT 21

Tellabs, Inc. and Subsidiaries

Subsidiaries of the Registrant

as of December 29, 2006



|                                                      |  |                                           
|----------------------------------------------------- |  | ------------------------------------------
|Name                                                  |  | State or OtherJurisdiction ofIncorporation
|Tellabs Operations, Inc.                              |  | Delaware                                  
|Tellabs Japan, Inc.                                   |  | Delaware                                  
|Tellabs International, Inc.                           |  | Illinois                                  
|Tellabs Communications Canada Ltd.                    |  | Canada                                    
|Tellabs do Brazil, Ltda.                              |  | Brazil                                    
|Tellabs H.K. Ltd.                                     |  | Hong Kong                                 
|Tellabs Pty. Ltd.                                     |  | Australia                                 
|Tellabs International de Mexico                       |  | Mexico                                    
|Tellabs Asia Pacific Private Limited                  |  | Singapore                                 
|Tellabs (Thailand) Co., Ltd.                          |  | Thailand                                  
|Tellabs Korea, Inc.                                   |  | Korea                                     
|Tellabs India Private Limited                         |  | India                                     
|Tellabs Communications International Ltd.             |  | China                                     
|Tellabs Communications Technology Ltd.                |  | China                                     
|Tellabs KK                                            |  | Japan                                     
|Tellabs de Venezuela, S.A.                            |  | Venezuela                                 
|Tellabs Communications (Malaysia) Sdn Bhd             |  | Malaysia                                  
|Tellabs Malaysia Sdn Bhd (49% joint venture)          |  | Malaysia                                  
|Tellabs Philippines, Inc.                             |  | Philippines                               
|Tellabs Holdings, B.V.                                |  | The Netherlands                           
|Tellabs Enterprises B.V.                              |  | The Netherlands                           
|Tellabs Oy                                            |  | Finland                                   
|Kiinteisto Oy Mestarinkaare                           |  | Finland                                   
|Kiinteisto Oy Sinimaentie 6                           |  | Finland                                   
|Tellabs Denmark A/S                                   |  | Denmark                                   
|Tellabs Communications (India) Private Limited        |  | India                                     
|Kring  Tellabs India Private Limited                 |  | India                                     
|Tellabs Holdings, Ltd.                                |  | Ireland                                   
|Tellabs (Ireland) Ltd.                                |  | Ireland                                   
|Tellabs Ltd.                                          |  | Ireland                                   
|Tellabs Research Ltd.                                 |  | Ireland                                   
|Tellabs Communications Ireland Limited                |  | Ireland                                   
|Tellabs Communications Technologies                   |  | Ireland                                   
|Tellabs EMEA Holdings, Ltd.                           |  | Ireland                                   
|Tellabs AB                                            |  | Sweden                                    
|Tellabs (S.A.) (Proprietary) Limited                  |  | South Africa                              
|Tellabs SAS                                           |  | France                                    
|Tellabs Italia S.r.l.                                 |  | Italy                                     
|Tellabs Netherlands B.V.                              |  | The Netherlands                           
|Tellabs Poland Sp. z o.o.                             |  | Poland                                    
|Tellabs Southern Europe S.A.                          |  | Spain                                     
|Tellabs GmbH                                          |  | Germany                                   
|Tellabs Austria Vertriebs GmbH                        |  | Austria                                   
|Tellabs Norway A/S                                    |  | Norway                                    
|Tellabs U.K. Ltd.                                     |  | United Kingdom                            
|Tellabs Communications UK Limited                     |  | United Kingdom                            
|E. Coherent Communications Systems                    |  | United Kingdom                            
|Tellabs North America, Inc.                           |  | Delaware                                  
|Tellabs Petaluma, Inc.                                |  | Delaware                                  
|Tellabs Vienna, Inc.                                  |  | Delaware                                  
|Advanced Fibre Technology Communications (HK) Limited |  | Hong Kong                                 



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|                                                        |  |                    
|------------------------------------------------------- |  | -------------------
|Hangzhou AFTEK Communication Company, Ltd.              |  | China              
|Advanced Fibre Communications (HK) Limited              |  | Hong Kong          
|AFC Foreign Sales Corporation                           |  | U.S. Virgin Islands
|Tellabs Bedford, Inc.                                   |  | Delaware           
|AccessLan India                                         |  | India              
|AFC India Private Limited                               |  | India              
|Advanced Fibre Communications International GmbH        |  | Switzerland        
|Advanced Fibre Communications Mexico S. de R.L. de C.V. |  | Mexico             
|Advanced Fibre Communications International Limited     |  | Cayman Islands     
|Advanced Fibre Communications U.K. Limited              |  | United Kingdom     
|AFC Harris Multimedia Communications Private Limited    |  | Mauritius          
|AFC Harris Multimedia Communications Limited            |  | India              
|Tellabs Mexico, Inc.                                    |  | Delaware           
|Tellabs de Mexico, S.A. de C.V.                         |  | Mexico             
|Tellabs TG, Inc.                                        |  | Delaware           
|Tellabs Transport Group, Inc.                           |  | Quebec             
|Tellabs Nevada Holding Corporation                      |  | Nevada             
|Tellabs Treasury Holdings Corporation                   |  | Nevada             
|Tellabs Equity Holding Corporation                      |  | Nevada             
|Tellabs Securities Holding Corporation                  |  | Nevada             
|Tellabs Reston, Inc.                                    |  | Delaware           
|Tellabs San Jose                                        |  | Delaware           
|Future Networks, Inc.                                   |  | Georgia