EXHIBIT 11

TELLABS, INC.

COMPUTATION OF PER SHARE EARNINGS

In millions, except per share amounts



|                                                                                                                |  |                |       |            |   |          |  |          |       |  |   |      
|--------------------------------------------------------------------------------------------------------------- |  | -------------- | ----- | ---------- | - | -------- |  | -------- | ----- |  | - | -----
|                                                                                                                |  | Second Quarter |       | Six Months
|                                                                                                                |  | 06/29/07       |       | 06/30/06   |   | 06/29/07 |  | 06/30/06
|Numerator:                                                                                                      |  |                |       |            |   |          |  |          |       |  |   |      
|                                                                                                                |  |                |       |           
|Net earnings                                                                                                    |  | $              | 29.6  |            | $ | 53.5     |  | $        | 55.1  |  | $ | 105.9
|                                                                                                                |  |                |       |            |   |          |  |          |       |  |   |      
|                                                                                                                |  |                |       |           
|Denominator:                                                                                                    |  |                |       |            |   |          |  |          |       |  |   |      
|                                                                                                                |  |                |       |           
|Denominator for basic earnings per share -Weighted average shares outstanding                                   |  |                | 438.1 |            |   | 447.7    |  |          | 438.1 |  |   | 448.8
|                                                                                                                |  |                |       |           
|Effect of dilutive securities:                                                                                  |  |                |       |            |   |          |  |          |       |  |   |      
|                                                                                                                |  |                |       |           
|Employee stock options and awards                                                                               |  |                | 5.2   |            |   | 10.8     |  |          | 5.1   |  |   | 10.8 
|                                                                                                                |  |                |       |            |   |          |  |          |       |  |   |      
|Denominator for diluted earnings per share -Adjusted weighted average sharesoutstanding and assumed conversions |  |                | 443.3 |            |   | 458.5    |  |          | 443.2 |  |   | 459.6
|                                                                                                                |  |                |       |            |   |          |  |          |       |  |   |      
|Net earnings per share  basic                                                                                  |  | $              | 0.07  |            | $ | 0.12     |  | $        | 0.13  |  | $ | 0.24 
|                                                                                                                |  |                |       |            |   |          |  |          |       |  |   |      
|Net earnings per share  diluted                                                                                |  | $              | 0.07  |            | $ | 0.12     |  | $        | 0.12  |  | $ | 0.23 
|                                                                                                                |  |                |       |            |   |          |  |          |       |  |   |