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What is CWDM Optical Transceiver?

CWDM optical transceiver is an optical module that uses CWDM technology, and is a low-cost WDM transmission technology for the access layer of the metropolitan area network. Using optical multiplexers at the transmitting end, CWDM optical modules can increase the network capacity by transmitting multiple data channels with separate optical wavelengths (1270nm-1610nm) on the same single fiber, and use demultiplexers at the receiving end to decompose into different Wavelength signals are then connected to different devices.

Classification of CWDM Optical Transceivers

The common used CWDM optical transceivers are CWDM SFP, 10G CWDM SFP+, 25G CWDM SFP28, and 40G CWDM QSFP+.


CWDM SFP is an optical transceiver that uses CWDM technology and packaged as SFP. The working wavelength of single-mode fiber transmission is 1270nm-1610nm, and the transmission distance is up to 20km to 120km, speed supports from 100Mbps to 4.25Gbps. It is widely used in 100M Ethernet, Gigabit Ethernet, 1G/2G/4G fiber channel and synchronous optical network.


10G CWDM SFP+ optical transceiver uses CWDM technology to combine different wavelengths together, and transmits through a single-mode optical fiber, thereby saved optical fiber resources. It adopts hot-swappable SFP+ package with working wavelength of 1271nm-1611nm, widely used in 10G Ethernet, optical transport network and 10G CPRI base station fronthaul. It is compatible with synchronous optical network and 10G fiber channel. The longest transmission distance is 10km to 80km.


25G CWDM SFP28 optical transceiver adopts a hot-swappable SFP28 package and connect to a single-mode optical fiber at a maximum transmission rate of 25G. It is used in 25G Ethernet and 5G fronthaul networks with a maximum transmission distance of 10 to 40km.


40G CWDM QSFP+ optical transceiver connect to single-mode optical fiber, the maximum transmission rate is 40G and the farthest transmission distance can reach 30 to 40km.

The transmission distance of the CWDM optical transceiver is not only related to the working wavelength, but also closely related to the devices inside.

Advantages of CWDM Optical Transceiver

The cost of CWDM-related equipment is relatively low, which can reduce network operating costs. The use of CWDM technology can significantly improve the utilization of optical fiber resources. One optical fiber is used as multiple optical fibers and there is no conflict between services. The optical module has small size and power consumption. Low, very good flexibility and scalability.

What is CWDM Optical Transceiver

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