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Views: 999 Author: Anna Publish Time: 2025-11-03 Origin: Site
A BIDI optical module is a single-fiber bidirectional optical module, or BiDi (Bidirectional). Conventional modules are dual-fiber modules (connected by two optical fibers), with two fiber ports at the interface: a transmit port (TX) and a receive port (RX). BIDI modules, however, are single-fiber modules with only one fiber port. Different optical signals are transmitted and received within a single fiber; therefore, BIDI optical modules must be used in pairs. Visually, a BIDI module has only one port and uses only one optical fiber for connection. The working principle of a BIDI optical module is that it uses a filter (filtering out unwanted center wavelengths) to simultaneously transmit one wavelength of optical signal and receive another. To achieve bidirectional communication, the other end must be able to receive one wavelength of optical signal and transmit the other. For example, if the transmitted optical signal at one end is 1310nm and the received optical signal is 1550nm, then the other end must be the opposite: the transmitted optical signal is 1550nm and the received optical signal is 1310nm.
A pair of 10G BiDi optical modules are installed on the switches at both ends, establishing 10G transmission using LC simplex patch cords.
A pair of SFP+ BiDi optical modules are inserted into the fiber optic converters at both ends and connected via a single-mode patch cord. The user connects the switch and the fiber optic converter using a network cable. This enables Ethernet-to-fiber transmission.
In this connection, SFP+ BiDi optical modules are deployed on the OEO converters at both ends, achieving multimode-to-single-mode transmission.
A BIDI optical module has only one port, through which signals from two frequency bands can be transmitted simultaneously without interference. An SFP optical module has two ports, using the same frequency band to transmit over two optical fibers, achieving the same goal of preventing interference between frequency bands.
BIDI uses only one optical fiber for bidirectional communication, optimizing fiber utilization. SFP transceivers typically require two optical fibers, one for data transmission and one for data reception.
Because BIDI transceivers receive and transmit signals over the same optical fiber, the wavelengths at the transmitting and receiving ends must be different to avoid signal interference. Furthermore, BIDI transceivers must be used in pairs. For example, if a 1310nm/1550nm BIDI module is used at end A, a corresponding 1550nm/1310nm BIDI module must be used at the other end. SFP modules do not require this consideration. Since they transmit signals over two fibers and have corresponding receivers and transmitters, they do not need to be used in pairs.
SFP modules are commonly used in scenarios with abundant fiber optic resources, such as telecommunications and carrier networks. Using SFP modules to connect multiple access points and core nodes ensures high-speed data transmission. Due to their wide compatibility and flexibility, such as using a 10/25GBASE-SR SFP28 module to connect networks of different speeds, SFP modules are also suitable for mixing various brands of equipment. BIDI modules, on the other hand, are suitable for scenarios with limited fiber optic resources or requiring high-density connections. For example, FTTH or high-density data centers only require a single fiber for data transmission and reception, thus significantly reducing costs and cabling complexity.
