Optical module cage with configurable heatsink

1. An optical module cage comprising: a first opening for slidably receiving an optical module;

a second opening positioned adjacent to said first opening for slidably receiving a riding heatsink separate from the optical module in a first configuration and an integrated heatsink connected to the optical module in a second configuration; and a guide rail comprising two rails extending inward from side walls of the optical module cage and interposed between said first opening and said second opening, wherein the guide rail is configured to support the riding heatsink and not interfere with insertion of the integrated heatsink.

2. The optical module cage of claim 1 wherein the rails are spaced from one another to provide a channel for receiving the integrated heatsink.

3. The optical module cage of claim 1 wherein the optical module comprises a QSFP (Quad Small Form-Factor Pluggable) inserted into said first opening without the riding heatsink, the guide rail providing a guide for insertion of the optical module into said first opening generally aligned with a connector.

4. The optical module cage of claim 1 wherein the optical module comprises a QSFP (Quad Small Form-Factor Pluggable) inserted in said first opening and wherein the riding heatsink is inserted into said second opening.

5. The optical module cage of claim 1 further comprising the optical module and the integrated heatsink inserted into said first and second openings of the optical module cage.

6. The optical module cage of claim 1 further comprising a spring for exerting a downward force on the riding heatsink to ensure thermal contact between the riding heatsink and the optical module.

7. The optical module cage of claim 6 wherein the spring comprises spring members connected to side walls of said second opening and operable in combination with the guide rail to exert said downward force on the riding heatsink.

8. The optical module cage of claim 6 wherein the spring is connected to an upper plate defining said second opening for exerting said downward force on the riding heatsink.

9. The optical module cage of claim 6 wherein the spring comprises a plurality of spring fingers.

10. The optical module cage of claim 6 wherein the spring is disposed on an upper surface of the heatsink.

11. The optical module cage of claim 10 wherein the spring comprise a compressible pad.

12. The optical module cage of claim 1 further comprising an EMI (Electromagnetic Interference) shield at a rear wall of said second opening to allow airflow along fins of the riding heatsink or the integrated heats ink while reducing EMI emissions.

13. The optical module cage of claim 1 wherein the optical module cage is configured for receiving two optical modules side-by-side or a single optical module having an increased width.

14. The optical module cage of claim 1 further comprising a sensor operable to detect insertion of the riding heatsink and transmit a signal to a line card controller.

15. An optical module cage comprising: a first opening for receiving an optical module;

a second opening positioned adjacent to said first opening and comprising a riding heatsink; and a guide rail interposed between said first opening and said second opening and supporting the riding heatsink;

wherein the riding heatsink is slidably removable from the second opening for insertion of an optical module with an integrated heatsink into said first and second openings and wherein side walls of the optical module cage are configured to support rails of the guide rail.

16. The optical module cage of claim 15 wherein the guide rail comprises two rails extending inward from the side walls and spaced from one another to provide a channel for receiving the integrated heatsink.

17. The optical module cage of claim 15 further comprising a spring for exerting a downward force on the riding heatsink to ensure thermal contact between the riding heatsink and the optical module.

18. The optical module cage of claim 15 wherein the riding heatsink is attached to a sleeve slidably receivable in the optical module cage with the optical module inserted therein.

19. A stacked optical module cage comprising: optical module openings for slidably receiving optical modules;

heatsink openings each configured for slidably receiving a riding heatsink separate from the optical modules in a first configuration and an integrated heatsink connected to one of the optical modules in a second configuration; and

guide rails extending inward from side walls of the stacked optical module cage and interposed between said optical module openings and said heatsink openings, wherein the guide rails are configured to support the riding heatsinks without interfering with insertion of the integrated heatsinks.