The demand for bigger capacity, higher bandwidth, and more accurate results will never slack in each and every data center and IT facilities. Meanwhile, your applications and competitive benefits are progressively relying on it. Which may explain why migrating from 10G to 40G has become a common and essential choice for many service carriers today. This post will shortly present the BiDi transceiver, which offers a cost-effective and viable alternative for bringing rates of 40-Gbps to the access layer.


Introduction to Transceiver BiDi

BiDi transceiver, also referred as the bidirectional transceiver, generally comprises of two different wavelengths to obtain transmission in both directions on a single fibre cable (single-mode or multimode). Unlike conventional optical transceivers that have two ports, BiDi transceivers have only one port. With wavelength division multiplexing (WDM) technique, BiDi transceiver allows different core wavelengths to send and receive the signal in both directions. BiDi optical module's most commonly used wavelength is 1310nm/1550nm, 1310nm/1490nm, 1510nm/1590nm. It is simple to differentiate BiDi transceiver from the standard one.

BiDi transceiver vs standard transceiver 


BiDi Transceiver Working Principle

The significant difference between BiDi transceivers and standard transceivers is that BiDi transceivers are integrated with WDM couplers that combine and separate data transferred over a single fiber depending on the light's wavelengths. The following image clearly shows how BiDi transceivers operate The two wavelengths used in this example are 1310nm and 1490nm. Usually the upstream transmit at the shorter wavelength, while the downstream transmit at the longer wavelength. What should be considered is that BiDi transceivers must be operated in pairs so that the diplexers can turn to match the transmitter and receiver transmitting data's expected wavelength


What Can BiDi Transceiver Achieve

  • With BiDi transceiver technology, achieving 40G connectivity becomes more stable. Your servers need it, your applications and customers require it, and your rivals are planning to implement it.

  • BiDi transceiver can decrease fiber cabling infrastructure costs as it needs less fiber cable and less fiber patch panels On the other side, BiDi transceiver also makes it feasible to save more valuable space in data centres.


QSFP Transceiver Solution BiDi

There are three kinds of frequently used BiDi transceivers: BiDi SFP+ transceivers, BiDi XFP transceivers, and QSFP BiDi transceivers. Since BiDi SFP+ transceivers and BiDi XFP transceivers are designed for bidirectional 10G serial optical data communication, QSFP BiDi transceivers allow reuse of existing 10G fiber infrastructure for 40G links.

40G QSFP BiDi transceiver has two 20G channels each broadcast and obtained independently over a single MMF strand (OM3 or OM4) on two wavelengths. It enables the existing 10G cabling system to be repurposed for 40G connectivity. Which means that you can bring 40G speeds to the access layer using the same 10G cable unit you are using today. In comparison, the overall QSFP SR4 transceiver like Cisco QSFP-40G-SR4 requires new patch cables and patch panels as the attachment forms vary and the cable trunk size needs to be quadrupled.


40G QSFP BiDi Transceiver


The QSFP-40G-SR-BD transceiver transmits 40G full-duplex traffic over an OM3 or OM4 MMF dual-fiber LC connector cable It can reuse 10G fiber systems This means that data center operators can upgrade to 40 G connectivity without making any changes to the previous 10G fiber cable installation. It's a huge price saving, whether you're upgrading your present data center or constructing a new one. And that means you can start taking advantage of 40G performance for your business right now.

BiDi transceiver works as an optimal and viable alternative in circumstances where only restricted fibers or conductive space are available And the implementation of BiDi transceivers effectively enhances the bandwidth capacity of the current optical fiber infrastructure and helps to attain the optical network's economic and efficient performance.