Optical module

1. An optical module comprising:

a first circuit board on which a connector socket is mounted;

an optical transceiver module that is electrically connected to the first circuit board via the connector socket;

a heat sink; and

a heat dissipating sheet, wherein

the optical transceiver module comprises:

a second circuit board on which an electrical-to-optical converter, a drive circuit that drives the electrical-to-optical converter, an optical-to-electrical converter, and a current-to-voltage conversion circuit that converts an output current of the optical-to-electrical converter into a voltage signal are face-down mounted; and

an optical waveguide that guides an optical signal generated by the electrical-to-optical converter to an output end of the optical transceiver module, and that guides an optical signal input to the optical transceiver module to the optical-to-electrical converter, and wherein

the heat sink is thermally coupled to the electrical-to-optical converter, the drive circuit, the optical-to-electrical converter, or the current-to-voltage conversion circuit, or any combination thereof via the heat dissipating sheet, and the heat sink presses the optical transceiver module onto the first circuit board.

2. The optical module according to claim 1 , wherein

one end of the second circuit board is held by a connector socket mounted on the first circuit board, and

a portion of the second circuit board is held to the first circuit board by the optical waveguide and an adhesive.

3. The optical module according to claim 1 , wherein

one end of the second circuit board is held by a connector socket mounted on the first circuit board, and

a portion of the second circuit board is held to the first circuit board by the optical waveguide, a lens that optically couples the waveguide with the electrical-to-optical converter and the optical-to-electrical converter, and an adhesive.

4. The optical module according to claim 1 , wherein the optical transceiver module is electrically connected to each surface of the first circuit board.

5. The optical module according to claim 4 , wherein

the heat sink includes a first heat sink and a second heat sink, and

the first circuit board is sandwiched by the first and second heat sinks so that the optical transceiver module is pressed onto each surface of the first circuit board.

6. The optical module according to claim 1 , wherein a control circuit that controls the drive circuit and the current-to-voltage conversion circuit is mounted on the first circuit board.

7. The optical module according to claim 1 , wherein

the electrical-to-optical converter, the drive circuit, the optical-to-electrical converter, and the current-to-voltage conversion circuit are face-down mounted on one surface of the second circuit board, and

the optical waveguide is stuck to the other surface of the second circuit board.

8. The optical module according to claim 1 , wherein the first circuit board has an edge connector corresponding to a vertical connection type edge connector socket.

9. The optical module according to claim 1 , wherein the second circuit board is a flexible printed circuit.

10. A blade server that includes a plurality of blades, wherein

each of the plurality of blades has the optical module according to claim 1 , and an optical signal is transmitted between the optical modules.