Floating front enclosure for pluggable module

1. A host device for receiving a pluggable electronic or optoelectronic module, comprising:

a front panel defining an opening configured to receive a pluggable module in a plugging direction;

a bezel assembly defining an opening configured to align with the front panel opening and to receive the pluggable module, the bezel assembly rigidly secured to the front panel;

a floating printed circuit board disposed behind the front panel; and

a first host guide and a second host guide rigidly secured to the floating printed circuit board and configured to guide the pluggable module when plugged into the host device, the first and second host guides and the bezel assembly operating together to allow the floating printed circuit board to float with respect to the front panel in the plugging direction while remaining substantially aligned with the front panel in directions normal to the plugging direction.

2. The host device of claim 1 , wherein the opening defined by the bezel assembly is asymmetric and is complementary to a cross-section of the pluggable module such that the pluggable module can only be received through the asymmetric opening in a single orientation.

3. The host device of claim 1 , wherein the bezel assembly comprises a front bezel extending forward from the front of the front panel, an electromagnetic interference gasket configured to form an electromagnetic shield between the front bezel and the front panel, and a rear bezel extending backward from the back of the front panel.

4. The host device of claim 3 , wherein the front bezel includes a first front bezel guide and a second front bezel guide, each of the first and second front bezel guides including a guide channel, the guide channels configured to receive first and second guiderails of the pluggable module.

5. The host device of claim 4 , wherein the first and second front bezel guides extend through the front panel opening and into an opening defined by the rear bezel.

6. The host device of claim 4 , further comprising:

a plurality of through holes formed at four inside corners of the front bezel; and

a plurality of tapped holes formed at four inside corners of the rear bezel;

wherein the plurality of tapped holes are configured to align with the plurality of through holes, each of the plurality of tapped holes configured to receive a fastener inserted through a corresponding one of the plurality of through holes to rigidly secure the front panel between the front bezel and the rear bezel.

7. The host device of claim 3 , wherein the printed circuit board includes a cutout configured to accommodate the rear bezel.

8. The host device of claim 1 , further comprising a first plurality of alignment posts formed at a front end of the first host guide and a second plurality of alignment posts formed at a front end of the second host guide, the first and second plurality of alignment posts configured to extend in the plugging direction into the bezel assembly opening at four inside corners of the bezel assembly opening to maintain alignment of the printed circuit board with the front panel in directions normal to the plugging direction.

9. A host device for receiving a pluggable optoelectronic module, comprising:

a front bezel including a first front bezel guide and a second front bezel guide, each of the first and second front bezel guides including a guide channel configured to receive a first or second guiderail of a pluggable module inserted through the front bezel in a plugging direction;

a rear bezel rigidly secured to the front bezel, the front and rear bezel forming a first opening configured to receive the pluggable module;

a front panel rigidly secured between the front bezel and the rear bezel, the front panel defining a second opening aligned with the first opening;

a printed circuit board configured to float in the plugging direction with respect to the front panel; and

a first host guide and a second host guide rigidly secured to the printed circuit board, the first host guide defining a first channel and the second host guide defining a second channel, the first and second channels configured to receive the first and second guiderails of the pluggable module;

wherein the first and second host guides and rear bezel operate together to allow the printed circuit board to float with respect to the front panel in the plugging direction while remaining substantially aligned with the front panel in directions normal to the plugging direction.

10. The host device of claim 9 , wherein the second opening is larger than the first opening to accommodate mechanical assembly tolerances caused by thickness variation in the printed circuit board.

11. The host device of claim 9 , wherein the first host guide is substantially identical to the second host guide except in orientation relative to the printed circuit board.

12. The host device of claim 9 , further comprising a host connecter coupled to the printed circuit board and configured to provide an electrical interface between the pluggable module and the printed circuit board, the host connector including a plurality of tapped holes configured to receive thumbscrews for securing the pluggable module directly to the host connector.

13. The host device of claim 9 , wherein the host device and pluggable module are substantially compliant with the 100G form-factor pluggable (“CFP”) multi-source agreement (“MSA”).

14. The host device of claim 9 , wherein the pluggable module includes an electromagnetic interference collar surrounding the pluggable module at a front end of the pluggable module, the electromagnetic interference collar configured to operate in conjunction with an inner surface of the front bezel to create an electromagnetic interference shield around the front of the pluggable module when plugged into the host device.

15. The host device of claim 14 , wherein the electromagnetic interference collar and front bezel are further configured to accommodate tolerance stack-up in the pluggable module in the plugging direction.

16. The host device of claim 9 , wherein the first guiderail extends from a first side of the pluggable module and the second guiderail extends from a second side opposite the first side of the pluggable module.