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1. In general, duplex is used;
2. BIDI SFP's are used in pairs in base stations or projects,to save fiber resources (1310nmTX/1550nmRX - 1550nmTX/1310nmRX

How to reduce fiber usage-BIDI (bidirectional)
With the rapid development of public telecommunications network, fiber resources will become tighter and tighter, and the demand for solutions to save fiber resources will gradually increase.

BIDI optical module is a single-fibre bidirectional optical module. It uses WDM technology to transmit and receive center wavelengths in two different directions to achieve bidirectional transmission of optical signals on an optical fiber. Optical modules generally have two ports: transmitting port (TX) and receiving port (RX), while BIDI optical modules have only one port, which is filtered by the filter in the multimode fiber module, and at the same time completes the transmission of optical signals of one wavelength and the other. One kind of wavelength optical signal reception (the wavelengths of BIDI optical modules are all combined forms), so BIDI optical modules must be used in pairs, and its biggest advantage is to save fiber resources.

Advantages of BIDI optical module
The most obvious advantage of using BIDI optical modules, such as SFP+ BIDI and SFP BIDI optical modules, lies in reducing the cost of optical fiber cabling infrastructure. The BIDI optical module reduces the number of ports on the fiber patch cord panel, reduces the space occupied by the tray dedicated to fiber management, and reduces the SFP interconnect cable that need to be used.

Although the price of BIDI optical modules (WDM optical modules) is higher than that of traditional dual-fiber bidirectional optical modules, the amount of light used per unit of transmission distance has been reduced by half. For many networks, the cost savings of using fewer fibers far exceeds the relatively high purchase price of dual-fibre bidirectional optical modules.

Primus IT BIDI solution includes SFP, SFP+, XFP, SFP28 etc, can be able to help customers control the cost and save the budget.

As one of the professional optical module manufacturers, Primus IT specializes in the development and manufacture 100 bases to 400G optical transceivers including GBIC, SFP, SFP+, SFP28, QSFP+, QSFP28, XFP, XENPAK, X2, CFP, CFP2, AOC, DAC, etc. Primus IT provides cost-effective transceivers solutions for customers worldwide in data communications, long-distance transmission, wireless networking and more.