This article explores the reasons for using BIDI modules in pairs.
1. A brief introduction of BIDI modules
Applying BIDI (bidirectional) modules to bidirectional transmission services can realize information transfer and reception simultaneously over a single optical fiber.
In the BIDI modules, there are usually two independent channels: one is for transmission, and the other is for the purpose of receiving data.
What’s more, at the transmitter side, the module allows data to turn into an optical signal, which will send data out over a single fiber. At the same time, on the receiving side, a different wavelength optical signal will receive the data.
2. BIDI Modules Working Principle
The working principle of Bidi modules uses the technology of WDM division multiplexing, adopting different wavelengths for bidirectional signal transmission over the same optical fiber.
For example, one module’s transmitting end uses a 1310nm wavelength to send signals, while its receiving end uses a 1550nm wavelength. The other module’s receiving end uses a 1550nm wavelength to receive signals, and its transmitting end operates at 1310nm. In this way, the transmitted and received signals do not interfere with each other, as they operate on different wavelengths.
3. Reasons for BIDI modules be used in pairs
3.1.Detailed Analysis of Using BIDI Modules in Pairs
Using a bidi connector, from what I understand, in pairs is matching the wavelength of the lasers being shot across the single strand. In simple terms, one has a send as say purple and receive as yellow; the pair would be send yellow and receive purple.
BiDi optics use a single strand of fiber, so they have to use wavelengths that won’t interact/interfere with each other. You’ll usually see something like: Site A _____________________ Site B Tx 1310 nm ——————> Rx 1310 nm Rx 1490 nm <—————— Tx 1490 nm You can see how they use the same base wavelengths but they use them in opposite directions. On a traditional optic, the transmitter and receiver allow operating within the same frequency range, so it’s easier to find a matching optic to pair with it, but on a BiDi optic, they’re directional about the frequencies they use, and thus you have to match the directionality of the wavelengths on top of everything else.
3.2. The benefits of using BiDi modules in Pairs
Using BIDI modules in pairs ensures that:
Correct Wavelength Matching: Each module is paired with another that operates on the complementary wavelength for both transmission and reception.
Efficient communication: The transmission and reception paths can achieve bi-directional communication over a single fiber. So it can reduce the need for multiple fibers.
Cost and Space Efficiency: It simplifies the fiber infrastructure, saving both physical space and reducing cabling costs while maintaining high-speed data transmission.
4. Apllication
Using BIDI modules in data centers, wide-area networks (WANs), and metropolitan area networks (MANs) can save fiber resources. They are capable of achieving efficient and high-capacity communication over a single optical fiber.
5. Conclusion
Wavelength allocation and fiber optic bi-directional transmission technology apply to the BIDI module working, which enables bi-directional data transmission by using multiple wavelengths on the same fiber for signal transmission and reception. In this way, the BIDI module not only saves fiber resources but also increases network efficiency and bandwidth usage.
