25G BIDI optical module is a single-fiber bidirectional 25G optical module. Compared with ordinary 25G optical modules, 25G BIDI have only one optical fiber port and only need one optical fiber to connect, it simultaneously sends and receives different center wavelengths in two directions within a single light, so as to realize the bidirectional transmission of optical signals on an optical fiber. Generally, the optical module has two ports: TX-transmitting port and RX-receiving port, while BIDI optical module has only one port, which is filtered by the filter in the optical module to complete the transmission and reception of optical signals at the same time. Therefore, BIDI modules must be used in pairs.
At present, there are four wavelength combinations of 25G BIDI optical modules: TX1270nm/RX1330nm, TX1330nm/RX1270nm, TX1310nm/RX1270nm, TX1270nm/RX1310nm. And the transmission distance is 10-40km. They are widely used in 25G Ethernet, data center construction and 5G front-haul networks.
The biggest advantage of the 25G BIDI optical module is that it reduces the cost of optical fiber cabling infrastructure. The BIDI optical module reduces the number of ports on the fiber patch cord panel and the number of optical cables that need to be used.