What is coarse wavelength division multiplexing CWDM optical module?

Wavelength division multiplexing WDM is to combine two or more different wavelength optical carrier signals (holding various information) at the sending end through a multiplexer (also referred to as a multiplexer) and couple it to the optical line. The technology of transmission in the same fiber; at the receiving end, the optical carriers of different wavelengths are separated by a demultiplexer (also called a demultiplexer or demultiplexer), and then processed by the optical receiver for further processing To restore the original signal. This technology of simultaneously transmitting several optical signals of different wavelengths in the same fiber is called wavelength division multiplexing.

Due to the difference in wavelength density, wavelength division multiplexing technology is divided into coarse wavelength division multiplexing CWDM and DWDM dense wavelength division multiplexing.OEMfibers communication introduces to you the coarse wavelength division multiplexing CWDM technology.
Coarse wavelength division multiplexing (CWDM) is definitely a technology that uses an optical multiplexer to multiplex the wavelengths transmitted in different optical fibers into one optical fiber for transmission. CWDM systems have a wide interval between multiplexed wavelengths, so CWDM's requirements for lasers and multiplexing/demultiplexers are greatly reduced, which greatly reduces the expense of expansion. Many optical devices use CWDM technology.

Only when the technology is applied to the object can it be fully reflected. Then, the coarse wavelength division multiplexing CWDM optical module is also produced.
The latest ITU standard for CWDM transceiver modules is G.695, which specifies 18 wavelength channels with an interval of 20nm from 1271nm to 1611nm. Considering the water peak effect of ordinary G.652 fiber, 16 channels are generally used. Because of the large channel spacing, the combined and demultiplexed devices and lasers are cheaper than DWDM devices.

The channel spacing of DWDM optical modules has different spacings such as 0.4nm, 0.8nm, 1.6nm, etc. The spacing is smaller and additional wavelength control devices are required, so equipment based on DWDM technology is more expensive than equipment predicated on CWDM technology.

Cisco 10g CWDM SFP+ provides 18 bands, from 1270nm to 1610nm, the interval between each band is usually 20nm, CWDM optical wave channel spacing is definitely wide, CWDM optical modulation uses uncooled laser, electronically tuned, multiple wavelength ratio of multiplexed light on the same fiber There are few DWDMs, and the explanation for the titles "coarse" and "dense" lies here.
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