How to send and receive bidirectionally using a single-mode single-fiber cable
Use BiDi (bidirectional) optical transceivers that employ two different wavelengths to transmit and receive data simultaneously over a single fiber.
How BiDi Technology Works
BiDi transceivers enable full-duplex communication on a single fiber by using two distinct wavelengths: one for transmitting (TX) and another for receiving (RX) data. For example, one end may transmit at 1310 nm while receiving at 1490 nm or 1550 nm, and the opposite end uses the complementary wavelength pair. This separation of wavelengths allows simultaneous bidirectional data flow without interference, effectively doubling the fiber's capacity compared to traditional dual-fiber setups .
Equipment Requirements
- BiDi SFP Modules: Available in various speeds such as 1G, 10G (SFP+), 25G (SFP28), and 100G (QSFP28), these modules are designed to match the wavelength pairs at each end of the fiber .
- Single-Mode Fiber: Required for long-distance transmission with minimal signal loss. The fiber must support the wavelengths used by the BiDi modules .
- Matched Pairs: BiDi modules must be deployed in pairs, with each module configured for complementary wavelengths to ensure proper communication .
Deployment Considerations
- Fiber-Constrained Environments: BiDi is ideal for situations where fiber availability is limited, such as data centers, metro networks, or FTTH/FFTO deployments .
- Cost and Efficiency: Using a single fiber reduces cabling costs, simplifies installation, and minimizes potential failure points .
- Planning: Ensure that the correct wavelength pair is installed at each end and that the modules are compatible with the network equipment and speed requirements.
Practical Example
At one end of the link, a BiDi transceiver transmits at 1310 nm and receives at 1490 nm. At the other end, the transceiver transmits at 1490 nm and receives at 1310 nm. This setup allows simultaneous two-way communication over a single fiber strand, eliminating the need for a second fiber for duplex communication . By deploying BiDi transceivers, networks can maximize existing fiber infrastructure, reduce installation complexity, and maintain high-speed, full-duplex connectivity without additional fiber cabling.
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