Bi-direction optical subassembly, combo optical module, and optical network device

A combo optical module, comprising:

• a housing;
• a bi-direction optical subassembly;
• and
• a circuit board;
• wherein the bi-direction optical subassembly is arranged in the housing and comprises a main body, a first transmitter, a second transmitter, a first receiver, and a second receiver;
• the main body comprises an optical transmission channel, a first optical transmission port, a second optical transmission port, a first optical reception port, a second optical reception port, and an optical fiber connection port;
• the first optical transmission port, the second optical transmission port, the first optical reception port, the second optical reception port, and the optical fiber connection port are connected to the optical transmission channel;
• the first transmitter is encapsulated in the first optical transmission port, and configured to generate a first optical signal with a first wavelength;
• the second transmitter is encapsulated in the second optical transmission port, and configured to generate a second optical signal with a second wavelength, wherein a transmission rate of the first optical signal is greater than a transmission rate of the second optical signal;
• the first receiver is encapsulated in the first optical reception port, and configured to receive a third optical signal with a third wavelength;
• the second receiver is encapsulated in the second optical transmission port, and configured to receive a fourth optical signal with a fourth wavelength;
• the first optical transmission port and the first optical reception port are arranged on a same side of the main body, the second optical transmission port is arranged opposite to the optical fiber connection port, the second optical reception port is opposite to the first optical reception port, and the second optical reception port is staggered with the first optical reception port;
• and
• the circuit board is arranged in the housing, and the bi-direction optical subassembly is electrically connected to the circuit board;
• wherein the optical transmission channel comprises a first optical channel connected between the second transmitter and the optical fiber connection port, a second optical channel connected between the first transmitter and the first optical channel, a third optical channel connected between the first receiver and the first optical channel, and a fourth optical channel connected between the second receiver and the first optical channel;
• the bi-direction optical subassembly further comprises a first filter, a second filter, a third filter, a fourth filter and a fifth filter, the first filter is arranged at an intersection between the first optical channel and the second optical channel;
• the second filter is arranged at an intersection between the first optical channel and the fourth optical channel, the third filter is arranged at an intersection between the first optical channel and the third optical channel, and the second filter is perpendicular to the third filter;
• the fourth filter is arranged at the third optical channel, and the fifth filter is arranged at the fourth optical channel, and a position of the fifth filter is opposite to positions of the second filter and the third filter;
• wherein an included angle between a normal of the first filter and an optical axis of the first optical channel, an included angle between a normal of the second filter and the optical axis of the first optical channel, and an included angle between a normal of the third filter and the optical axis of the first optical channel are 45°;
• an included angle between a normal of the fourth filter and an optical axis of the third optical channel is 0°, and an included angle between a normal of the fifth filter and an optical axis of the fourth optical channel is 0°;
• wherein the bi-direction optical subassembly further comprises a base part, an isolator and a lens, the base part is embedded in the main body, the lens and the isolator are sequentially arranged between the first filter and the third filter in the first optical channel, and the lens and the isolator are respectively connected to the base part, the lens is configured to collimate an emission beam transmitted from the first filter, and the isolator is configured to transmit the emission beam transmitted from the lens.