Working principle of BIDI single fiber bidirectional optical module
To achieve simultaneous transmission of optical signals in both directions, BIDI single fiber bidirectional optical modules require the use of different optical wavelengths in both directions. Generally, optical modules have two ports, one transmitting port and one receiving port. And the single fiber bidirectional optical module only has one port, which is filtered by the filter in the optical module, and simultaneously completes the transmission of one wavelength optical signal and the reception of another wavelength optical signal, or vice versa.
Using WDM technology, different center wavelengths are used for both sending and receiving directions. Realize bidirectional transmission of optical signals through a single optical fiber. Generally, optical modules have two ports, TX is the transmitting port and RX is the receiving port;
The BIDI optical module only has one port, which is filtered by the filter in the optical module, and simultaneously completes the transmission of 1310nm optical signals and the reception of 1550nm optical signals, or vice versa. Therefore, this module must be used in pairs, and its biggest advantage is to save fiber optic resources.
The dual fiber bidirectional and BIDI optical modules actually have the same effect when used, the only difference is that customers can choose single fiber or dual fiber according to their own needs.
Single fiber bidirectional optical modules are relatively expensive, but they can save one fiber resource, making them a better choice for users with insufficient fiber resources.
Dual fiber bidirectional optical modules are relatively inexpensive, but require the use of an additional fiber. If fiber resources are abundant, dual fiber optical modules can be chosen.