EXHIBIT 11

TELLABS, INC.

COMPUTATION OF PER SHARE EARNINGS

In millions, except per share amounts



|                                                                     |  |               |        |             |         |   |         |  |   |         |   |  |   |      
|-------------------------------------------------------------------- |  | ------------- | ------ | ----------- | ------- | - | ------- |  | - | ------- | - |  | - | -----
|                                                                     |  | Third Quarter |        | Nine Months
|                                                                     |  | 9/26/08       |        |             | 9/28/07 |   | 9/26/08 |  |   | 9/28/07
|Numerator:                                                           |  |               |        |             |         |   |         |  |   |         |   |  |   |      
|                                                                     |  |               |        |            
|Net (loss) earnings                                                  |  | $             | (998.5 | )           |         | $ | 3.6     |  | $ | (942.9  | ) |  | $ | 58.7 
|                                                                     |  |               |        |             |         |   |         |  |   |         |   |  |   |      
|Denominator:                                                         |  |               |        |             |         |   |         |  |   |         |   |  |   |      
|                                                                     |  |               |        |            
|Denominator for basic earnings per share -                           |  |               |        |             |         |   |         |  |   |         |   |  |   |      
|                                                                     |  |               |        |            
|Weighted average shares outstanding                                  |  |               | 398.0  |             |         |   | 439.2   |  |   | 401.1   |   |  |   | 438.5
|                                                                     |  |               |        |            
|Effect of dilutive securities:                                       |  |               |        |             |         |   |         |  |   |         |   |  |   |      
|                                                                     |  |               |        |            
|Stock options and awards                                             |  |               |       |             |         |   | 5.3     |  |   |        |   |  |   | 5.3  
|                                                                     |  |               |        |             |         |   |         |  |   |         |   |  |   |      
|Denominator for diluted earnings per share -                         |  |               |        |             |         |   |         |  |   |         |   |  |   |      
|Adjusted weighted average shares outstanding and assumed conversions |  |               | 398.0  |             |         |   | 444.5   |  |   | 401.1   |   |  |   | 443.8
|                                                                     |  |               |        |             |         |   |         |  |   |         |   |  |   |      
|Net (loss) earnings per share  basic                                |  | $             | (2.51  | )           |         | $ | 0.01    |  | $ | (2.35   | ) |  | $ | 0.13 
|                                                                     |  |               |        |             |         |   |         |  |   |         |   |  |   |      
|Net (loss) earnings per share  diluted                              |  | $             | (2.51  | )           |         | $ | 0.01    |  | $ | (2.35   | ) |  | $ | 0.13 
|                                                                     |  |               |        |             |         |   |         |  |   |         |   |  |   |      

Under GAAP, dilutive securities are not included in the computation of diluted earnings per share when a company
is in a loss position.



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