EXHIBIT 11

TELLABS, INC.

COMPUTATION OF PER SHARE EARNINGS

In millions, except per share amounts



|                                                                     |  |               |       |             |   |          |  |          |       |  |   |      
|-------------------------------------------------------------------- |  | ------------- | ----- | ----------- | - | -------- |  | -------- | ----- |  | - | -----
|                                                                     |  | Third Quarter |       | Nine Months
|                                                                     |  | 09/28/07      |       | 09/29/06    |   | 09/28/07 |  | 09/29/06
|Numerator:                                                           |  |               |       |             |   |          |  |          |       |  |   |      
|Net earnings                                                         |  | $             | 3.6   |             | $ | 59.1     |  | $        | 58.7  |  | $ | 165.0
|                                                                     |  |               |       |             |   |          |  |          |       |  |   |      
|Denominator:                                                         |  |               |       |             |   |          |  |          |       |  |   |      
|Denominator for basic earnings per share -                           |  |               |       |             |   |          |  |          |       |  |   |      
|Weighted average shares outstanding                                  |  |               | 439.2 |             |   | 445.5    |  |          | 438.5 |  |   | 447.7
|Effect of dilutive securities:                                       |  |               |       |             |   |          |  |          |       |  |   |      
|Stock options and awards                                             |  |               | 5.3   |             |   | 5.7      |  |          | 5.3   |  |   | 9.2  
|                                                                     |  |               |       |             |   |          |  |          |       |  |   |      
|Denominator for diluted earnings per share -                         |  |               |       |             |   |          |  |          |       |  |   |      
|Adjusted weighted average shares outstanding and assumed conversions |  |               | 444.5 |             |   | 451.2    |  |          | 443.8 |  |   | 456.9
|                                                                     |  |               |       |             |   |          |  |          |       |  |   |      
|Net earnings per share  basic                                       |  | $             | 0.01  |             | $ | 0.13     |  | $        | 0.13  |  | $ | 0.37 
|                                                                     |  |               |       |             |   |          |  |          |       |  |   |      
|Net earnings per share  diluted                                     |  | $             | 0.01  |             | $ | 0.13     |  | $        | 0.13  |  | $ | 0.36 
|                                                                     |  |               |       |             |   |          |  |          |       |  |   |