Planar decoupling in optical subassembly

1. An optical transceiver comprising:

a housing;

a circuit board coupled within the housing;

an optical subassembly having a can and a barrel, the optical subassembly coupled within the housing; and

a decoupling device coupled to the can of the optical subassembly, wherein the decoupling device has a plurality of planar layers including a dielectric layer and at least a first metallic layer.

2. The optical transceiver of claim 1 , wherein the can of the optical subassembly has an end surface that is metallic such that the metallic end surface, the dielectric layer and the first metallic layer form a planar capacitor.

3. The optical transceiver of claim 1 further including a plurality of pins extending from the can of the optical subassembly, wherein at least one of the pins is electrically coupled to the first metallic layer.

4. The optical transceiver of claim 3 , wherein a first pin of the plurality of pins is coupled to a source voltage cc , wherein a second pin of the plurality or pins is coupled to ground, and wherein at least one of the first and second pins are coupled to the first metallic layer.

5. The optical transceiver of claim 4 , wherein a third pin of the plurality of pins is coupled to a carrying signal.

6. The optical transceiver of claim 1 , wherein the decoupling device further includes a second metallic layer.

7. The optical transceiver of claim 6 , wherein the first metallic layer, the dielectric layer and the second metallic layer form a planar capacitor.

8. The optical transceiver of claim 1 , wherein the decoupling device further includes a first and a second insulating layer outside the first and second metallic layers.

9. The optical transceiver of claim 1 further comprising a second optical subassembly.

10. The optical transceiver of claim 9 , wherein the second optical subassembly includes a can and a barrel and a second decoupling device coupled to the can of the second optical subassembly.

11. The optical transceiver of claim 1 , wherein the dielectric is made of Mylar®.

12. The optical transceiver of claim 1 , wherein the transceiver is a small form factor transceiver.

13. An optical transceiver comprising:

housing;

a circuit board coupled to the housing;

an optical subassembly having a can and a barrel, the optical subassembly configured within the housing and coupled to the circuit board;

wherein optical signals within the optical subassembly are converted to electrical signals and transmitted to the circuit board; and

wherein electrical signals from the circuit board are transmitted to the optical subassembly for converting to optical signals; and

means for decoupling electrical signals transmitted in the optical assembly, wherein the means for decoupling electrical signals includes a decoupling device having a plurality of planar layers including a dielectric layer and at least a first metallic layer.

14. The optical transceiver of claim 13 , wherein the can of the optical subassembly has an end surface that is metallic such that the metallic end surface, the dielectric layer and the first metallic layer form a planar capacitor.

15. The optical transceiver of claim 13 further including a plurality of pins extending from the can of the optical subassembly, wherein at least one of the pins is electrically coupled to the first metallic layer.

16. The optical transceiver of claim 15 , wherein a first pin of the plurality of pins is coupled to a source voltage V cc , wherein a second pin of the plurality of pins is coupled to ground, and wherein at least one of the first and second pins are coupled to the first metallic layer.

17. The optical transceiver of claim 13 , wherein the decoupling device further includes a second metallic layer.

18. The optical transceiver of claim 17 , wherein the first metallic layer, the dielectric layer and the second metallic layer form a planar capacitor.