The BIDI optical module is a single-fiber bidirectional optical module, namely BiDi (Bidirectional). The conventional module is a dual-fiber module (connected by two optical fibers), and there are two optical fiber ports at the optical fiber interface: the transmitting port (TX) and the receiving port (RX), while the BIDI module is a single-fiber module with only one optical fiber port and one optical fiber port. Different optical signals are transmitted and received inside, so BIDI optical modules must be used in pairs. In terms of appearance, the BIDI module has only one port and is connected with only one optical fiber.
The working principle of the BIDI optical module is to filter through the filter in the optical module (filter the unnecessary central wavelength), and complete the transmission of an optical signal of one wavelength and the reception of an optical signal of another wavelength at the same time. In order to achieve two-way communication, there must be The other end completes the reception of an optical signal of one wavelength and the transmission of an optical signal of another wavelength. For example, the optical signal emitted by this end is 1310nm and the received optical signal is 1550nm, then the optical signal at the other end must be the opposite, that is, the emitted optical signal is 1550nm and the received optical signal is 1310nm. This is why BIDI modules are used in pairs.
