A brief introduction of BIDI SFP+

bidi sfp+ sale

What is the BiDi SFP+ 1-fiber optical module?

First, we will explain to you what the term “BIDI” is: Bi-Directional Transceiver (BiDi) is a compact optical transceiver module that uses WDM (wavelength division multiplexing) technology and complies with SFP multi-source agreement (MSA) ). With bidirectional technology, transceiver modules only need a single fiber optic cable to transmit and receive data with network device connections.

The BiDi SFP+ 1-fiber optical module is packed in SFP+, LC simplex interface and transmission distance up to 80 km with 1-fiber fiber. BiDi refers to a bidirectional optical fiber that uses WDM (ie, wavelength division multiplexing) technology to send and receive different center wavelengths in both directions, thus realizing bidirectional transmission. optical signal by an optical fiber.

BIDI SFP+ module
BIDI SFP+ module

Advantages of BIDI SFP+

The 2-fiber optical module has two ports such as the TX transmission port and RX receiving port, while the BiDi 1-fiber optical module has only one port. The BiDi 1-fiber optical module can complete optical signal transmission and reception at the same time. That is why BiDi optical modules must be used in pairs.

The biggest advantage of the BiDi optical module is saving fiber resources and turning two transmission fibers into one. BiDi 1-fiber modules reduce the cost of fiber infrastructure and the number of ports on the fiber panel, while also reducing the space occupied by trays dedicated to fiber management.

SFP BiDi 1-fiber optical module and 2-fiber optical module use the same effect. But in the integrated wiring, the BiDi optical module can not only save fiber resources but also greatly reduce the layout cost.

How is 10Gbase BX SFP implemented? Technical principle of 1 fiber optical module

A bidirectional optical fiber refers to the transmission and sending of optical signals in both directions simultaneously in a single optical fiber. Optical modules used in wireless equipment are all integrated optical modules. The fiber optic bidirectional module has two ports connecting to the fiber, while the fiber optic bidirectional module 1 has only one port to connect to the fiber.

A bidirectional fiber is mainly implemented by WDM. The light module on the side of the BBU sends a laser of wavelength 1 through a 45° spectrometer and then coupled to the optical fiber. At the AAU end, a light signal of wavelength 1 is received after being reflected by the spectrometer at 45°; And vice versa.

Figure: bidi-transceiver-working-principle

Fiber 1 bidirectional optical modules use different wavelengths, and the operating wavelength of 5G front-haul optical modules is usually 1270nm / 1330nm or 1270nm / 1310nm. That is, fiber bidirectional light module 1 has two models, which must be used in pairs. For communication systems without obvious A and B ends (such as laboratories and other ring networks), it is easy to make mistakes when using them, while for communication systems with clear A and B ends. Obviously, as long as the optical module has A certain wavelength is defined for either end A or B.

The main difference between 10G SFP+ BIDI and traditional SFP

The basic difference between BiDi SFP+ and traditional two-fiber SFP transceivers is that the BiDi SFP+ is equipped with a wavelength division multiplexer (WDM), also known as a duplexer, which combines and separates the transmitted data. over a single fiber based on the wavelength of light. That is why BiDi SFP+ has only one port, while a traditional SFP module usually has two ports. One is TX for the transmit port, and the other is RX for the receive port.

bidi sfp vs traditional sfp
Figure: bidi sfp vs traditional sfp

Another difference between the BiDi SFP+ and the conventional SFP is the construction of optical sub-assemblies. They can be seen as the main cost components of a fiber optic transceiver. A normal SFP usually has two optical sub-clusters, TOSA (optical-transmission sub-cluster) and ROSA (optical-receiver sub-cluster). Meanwhile, BiDi SFP+ contains only one BOSA optical sub-cluster (directional optical auxiliary), which plays the role of TOSA and ROSA, but with different working principles.

Applications of SFP-10G-BX

Currently, BiDi SFP+ is commonly used in P2P (point to point) connections implementing FTTx. For example, in an FTTH deployment, optical fibers are used directly to connect the central office and equipment at a customer’s premises. But since BiDi SFP+ uses a P2P architecture, it must use a dedicated optical cable to connect the equipment at the customer’s premises to the central office. Data exchange between equipment at the customer’s premises and the central office becomes simpler with BIDI SFP+.  BiDi SFP+ enables bidirectional communication over a single fiber using wavelength division multiplexing (WDM).  In addition, BiDi SFP+ is also widely used in metropolitan area networking, WDM fast Ethernet links, and system communication between servers, switches, routers, OADM, etc.


BiDi SFP+ transceivers serve as the ideal and viable solution in situations where only fiber is available or where conduit space is limited. And the deployment of BiDi optical transceivers effectively enhances the bandwidth capacity of the existing fiber infrastructure and helps to achieve the economic and reliable performance of the optical network. Although the cost of BiDi transceivers may be more expensive than conventional types, in the long run, it is a solution to help you save more money.

QSFPTEK has a wide range of BIDI SFP+ available at affordable prices for you to choose from. If you still have doubts, please contact support immediately for enthusiastic advice.


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