Single-fiber bi-directional optical transceiver sub-assembly

A single-fiber bi-directional optical transceiver sub-assembly comprising:

• a housing;
• an optical receptacle;
• a transmitting-side photoelectric converter;
• a receiving-side photoelectric converter;
• a multiplexing/demultiplexing filter disposed on an optical path between the optical receptacle and the transmitting-side photoelectric converter and on an optical path between the optical receptacle and the receiving-side photoelectric converter;
• an isolator configured to pass an optical signal outputted from the transmitting-side photoelectric converter and block an optical signal proceeding to the transmitting-side photoelectric converter;
• a first collimating lens, disposed on an optical axis between the optical receptacle and the multiplexing/demultiplexing filter, disposed at a position that fits into an external size of the housing, and configured to collimate incident light on the multiplexing/demultiplexing filter;
• and
• a second collimating lens disposed on an optical axis between the transmitting-side photoelectric converter and the multiplexing/demultiplexing filter, wherein
• the first collimating lens is disposed at a position within a width along a first direction of the receiving-side photoelectric converter, the first direction being an optical axis direction of the optical receptacle,
• the isolator is disposed on the optical axis between the transmitting-side photoelectric converter and the multiplexing/demultiplexing filter, and
• the second collimating lens is disposed on an optical axis between the transmitting-side photoelectric converter and the isolator.