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Everything You Need to Know About BiDi Transceivers

BiDi Transceiver

The Bi-Directional (BiDi) transceiver is a compact optical transceiver module that utilizes wavelength division multiplexing (WDM) technology, it is compliant with the SFP Multi-Source Agreement (MSA). Bi-directional technology enables bi-directional communication (transmit and receive) on a single fiber. This allows the BiDi transceiver module to efficiently send and receive data to and from interconnected network devices, such as network switches or routers, using only a single fiber.


How Do BiDi Transceivers Work?


The BiDi transceiver is equipped with a WDM coupler and duplexer, making it possible to use different wavelengths of light combined or separated and to transmit data on a single fiber. BiDi differs from traditional optical modules in that it must be used in pairs, with one module in the upstream direction and the other in the downstream direction, each transmitting a distance at a different wavelength. Point A transmits to point B over a fiber using 1310nm, and at the other end, point B receives the data over a fiber using 1310nm and transmits it back to point A over this fiber using 1490nm. At this point, the receiver at point A receives the data transmitted over this segment of the 1490nm wavelength.

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The Different Types of BiDi Transceivers


BiDi transceivers are available at different rates, transmission rates, and wavelengths. The next part is a detailed description of the different types:


1G BiDi Transceivers


1G BiDi SFP transceivers are widely used in 1G network deployments in modern networks. For distances up to 40km, the wavelength schemes are 1310nm/1550nm and 1310nm/1490nm, and for distances above 40km, the wavelength schemes are 1550nm/1490nm.


10G BiDi Transceivers


10G BiDi SFP transceivers are another common type, designed for 10G deployments. These transceivers use a 1550/1490nm transmitter and a 1490/1550nm receiver to support bi-directional 10G serial optical communications over distances of up to 80 km. BiDi is also available in the XFP form factor, which is suitable for 10G applications. 25G BiDi transceivers are also available in the XFP form factor, suitable for 10G applications.


25G BiDi Transceivers


The 25G BiDi transceiver supports 25GBASE-BX throughput up to 40km over single-mode fiber (SMF) using 1310nm-TX/1270nm-RX wavelengths via LC simplex connectors. The transceiver must be paired with another transceiver or network equipment with complementary wavelengths. It provides 25GBASE Ethernet connectivity options for 25G Ethernet, telecom, and data centers.


40G BiDi Transceivers


40G QSFP+ BiDi modules typically use 850nm wavelengths for stable transmission in multimode fiber systems. Transmission distances are 300 meters with OM3 patch cords, extended to 400 meters with OM4 patch cords, and up to 500 meters with OM5 patch cords.


100G BiDi Transceiver


The 100G BiDi transceiver uses a duplex LC connector interface and is ideal for Ethernet and data centers. Transmission distance is 75 meters with OM3 patch cables, 100 meters with OM4 patch cables, and up to 150 meters with OM5 patch cables.


400G BiDi Transceiver


The 400G BiDi module uses a quadruple version of the 100G BiDi method, using four pairs of fiber (consistent with a 4+4 fiber MPO infrastructure). We can also offer digitally coherent CFP2 transceivers capable of supporting wavelengths up to 400 Gbps. The miniaturized CFP2 DCO supports line rates up to 400 Gbps and enables single-fiber bi-directional transmission using a dual-laser approach at Tx and Rx.


What is the Application of BiDi Module?


The BiDi module transforms transmission over single-fiber optics, a unique transmission method that significantly reduces the use of fiber resources. BiDi modules are primarily deployed in packet transport networks (PTNs). The BiDi module is mainly deployed in Packet Transport Networks (PTNs) and can significantly help increase the capacity of network links and improve the speed of maintenance for maintenance personnel. At the same time, this solution for expanding fiber optic resources is also more economical for users. The following section shows some of the applications of BiDi transceivers.


Data Center


The BiDi optical module optimizes data center affordability, significantly increasing data center transmission rates and saving up to half of the fiber footprint.




BiDi with a WDM system can realize ultra-long distance transmission, this solution also has the characteristics of cost-effective and high performance, especially suitable for telecommunication networks with long-distance data transmission needs.


5G Front Haul Application


In the 5G front haul program, BiDi optical modules also have a part; the most widely used is the 25G BiDi SFP28 optical transceiver module, each deployment plan will be the specific implementation of this program time and occupy resources play a huge impact, 6COM can provide you with point-to-point fiber optic direct-drive solutions (single-fiber bi-directional), our program can meet your requirements for the bandwidth, latency, transmission distance to meet the performance requirements of the 5G front haul.




According to this article, we know that the use of a BiDi transceiver and a suitable fiber can improve the overall performance of the network, and also well for network efficiency, and save the space occupied by the network fiber; the use of BiDi modules can be successful. Currently, many industries have been using BiDi for a long time, which fully proves its feasibility and versatility. 6COM can provide you with a BiDi transceiver with multiple rates, and at the same time, our professional engineers can design the network solution for you free of charge. Get one-stop service at 6COM!

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