EXHIBIT 11

TELLABS, INC.

COMPUTATION OF PER SHARE EARNINGS

In millions, except per share amounts



|                                                                     |  |                |       |            |   |         |  |         |       |  |   |      
|-------------------------------------------------------------------- |  | -------------- | ----- | ---------- | - | ------- |  | ------- | ----- |  | - | -----
|                                                                     |  | Second Quarter |       | Six Months
|                                                                     |  | 6/27/08        |       | 6/29/07    |   | 6/27/08 |  | 6/29/07
|Numerator:                                                           |  |                |       |            |   |         |  |         |       |  |   |      
|Net earnings                                                         |  | $              | 39.0  |            | $ | 29.6    |  | $       | 55.6  |  | $ | 55.1 
|                                                                     |  |                |       |            |   |         |  |         |       |  |   |      
|                                                                     |  |                |       |           
|Denominator:                                                         |  |                |       |            |   |         |  |         |       |  |   |      
|Denominator for basic earnings per share -                           |  |                |       |            |   |         |  |         |       |  |   |      
|Weighted average shares outstanding                                  |  |                | 397.5 |            |   | 438.1   |  |         | 402.7 |  |   | 438.1
|Effect of dilutive securities:                                       |  |                |       |            |   |         |  |         |       |  |   |      
|Stock options and awards                                             |  |                | 1.0   |            |   | 5.2     |  |         | 0.9   |  |   | 5.1  
|                                                                     |  |                |       |            |   |         |  |         |       |  |   |      
|Denominator for diluted earnings per share -                         |  |                |       |            |   |         |  |         |       |  |   |      
|Adjusted weighted average shares outstanding and assumed conversions |  |                | 398.5 |            |   | 443.3   |  |         | 403.6 |  |   | 443.2
|                                                                     |  |                |       |            |   |         |  |         |       |  |   |      
|                                                                     |  |                |       |           
|Net earnings per share  basic                                       |  | $              | 0.10  |            | $ | 0.07    |  | $       | 0.14  |  | $ | 0.13 
|                                                                     |  |                |       |            |   |         |  |         |       |  |   |      
|Net earnings per share  diluted                                     |  | $              | 0.10  |            | $ | 0.07    |  | $       | 0.14  |  | $ | 0.12 
|                                                                     |  |                |       |            |   |         |  |         |       |  |   |      



27