Optical module including a clamp
View Patent ↗An optical module is provided for mounting in a cage of a host device. The optical module includes at least one optical subassembly (OSA) and a printed circuit board (PCB) supported by a first housing structure. The optical module also includes a latch mechanism, which includes a lever and a latch, as well as a clamp. A pivot pin of the latch is rotatably supported by the first housing structure and the clamp in cooperation. Advantageously, the clamp secures both the OSA and the latch, while providing access to the PCB.
1. An optical module for mounting in a cage of a host device, comprising:
a first housing structure;
a first optical subassembly (OSA) supported by the first housing structure;
a printed circuit board (PCB) supported by the first housing structure and electrically connected to the first OSA;
a clamp mounted on the first housing structure to secure the first OSA while providing access to the PCB when the PCB is uncovered;
a latch supported by the first housing structure and secured by the clamp, including a latch hook at one end thereof, an actuator at an opposite end thereof, and a pivot pin therebetween, the pivot pin rotatably supported by the first housing structure and the clamp in cooperation;
a lever rotatably mounted on the first housing structure to rotate between a latched position, in which the latch hook engages the cage, and an unlatched position, in which the latch hook is disengaged from the cage, wherein, upon rotating from the latched position to the unlatched position, the lever engages the actuator to rotate the latch about the pivot pin and disengage the latch hook from the cage; and
a second housing structure supported by the first housing structure to at least partially cover the PCB.
2. The optical module of claim 1 , further including a second OSA supported by the first housing structure, secured by the clamp, and electrically connected to the PCB.
3. The optical module of claim 2 , wherein the first OSA is a transmitter optical subassembly (TOSA); and wherein the second OSA is a receiver optical subassembly (ROSA).
4. The optical module of claim 3 , wherein the TOSA includes a dual row of pins; wherein the PCB includes a dual row of pads; and wherein the PCB is electrically connected to the TOSA through a direct connection between the dual row of pads and the dual row of pins.
5. The optical module of claim 2 , wherein the first housing structure includes a first OSA recess supporting the first OSA, and a second OSA recess supporting the second OSA.
6. The optical module of claim 5 , wherein the clamp includes a third OSA recess holding the first OSA, and a fourth OSA recess holding the second OSA; wherein the first OSA includes a first sleeve; wherein the second OSA includes a second sleeve; wherein the first OSA recess and the third OSA recess cooperate to form a first positioning channel receiving the first sleeve; and wherein the second OSA recess and the fourth OSA recess cooperate to form a second positioning channel receiving the second sleeve.
7. The optical module of claim 1 , wherein the first housing structure includes a first partial bearing surface; wherein the clamp includes a second partial bearing surface; and wherein the first partial bearing surface and the second partial bearing surface form a complete bearing surface for the pivot pin.
8. The optical module of claim 1 , wherein the first housing structure includes a first pivot recess; wherein the clamp includes a second pivot recess; and wherein the first pivot recess and the second pivot recess cooperate to rotatably support the pivot pin.
9. The optical module of claim 1 , wherein the actuator includes two opposing abutment tabs and an actuator body therebetween; wherein the lever is a bail including two opposing arms and a handle therebetween, each arm including a cam at an end thereof opposite the handle; and wherein upon rotating the lever from the latched position to the unlatched position, the cams engage the abutment tabs to rotate the latch about the pivot pin and disengage the latch hook from the cage.
10. The optical module of claim 9 , wherein the PCB is electrically connected to the first OSA through a direct connection between pads on the PCB and pins on the first OSA.
11. The optical module of claim 9 , wherein the abutment tabs have curved edges opposite the actuator body.
12. The optical module of claim 9 , wherein the actuator body has a thickness of less than about 0.6 mm.
13. The optical module of claim 1 , wherein the clamp includes a yoke securing the first OSA to the first housing structure.
14. The optical module of claim 13 , wherein the latch further includes a latch body between the actuator and the pivot pin; and wherein the clamp further includes a crossbar extending across the latch body.
15. The optical module of claim 14 , wherein the latch body is narrower than the actuator and the pivot pin; and wherein opposite ends of the crossbar are fastened to the first housing structure.
16. The optical module of claim 1 , wherein the second housing structure is a three-sided housing structure vertically mounted on the first housing structure.
17. The optical module of claim 16 , wherein the second housing structure includes a spring tab biasing the latch into the latched position.
18. The optical module of claim 17 , wherein the spring tab is a curved spring tab.
19. The optical module of claim 17 , wherein the latch further includes a latch body between the actuator and the pivot pin; wherein the clamp includes a tab opening; and wherein the spring tab extends through the tab opening into contact with the latch body.
20. The optical module of claim 19 , wherein the clamp further includes a hook gap; wherein the spring tab includes a hook opening; and wherein the latch hook extends through the hook gap and the hook opening to engage the cage in the latched position.