WDM wavelength division multiplexing technology is the preferred solution for 5G fronthaul network. According to different wavelengths, it can be divided into DWDM dense wavelength division multiplexing, CWDM coarse wavelength division multiplexing, FWDM filter wavelength division multiplexing, and MWDM medium wavelength division multiplexing. And LWDM fine wavelength division multiplexing. Among them, CWDM and DWDM are the most common. Do you know these five WDM wavelength division multiplexing technologies?

CWDM is a coarse wavelength division multiplexing technology, facing the access layer of the metropolitan area network. It has 18 different wavelength channels. The different wavelengths of each channel are separated by 20nm, and the wavelength range is 1270 nm-1610 nm. The wavelength band covers single-mode The optical fiber system has five bands of O, E, S, C, and L. The CWDM system can increase the transmission capacity of the optical fiber in the construction of the metropolitan area network, improve the utilization of optical fiber resources, and thus reduce the operating cost of the network.

dense wavelength division multiplexing dwdm
DWDM is a dense wavelength division multiplexing technology with a channel spacing of 1.6/0.8/0.4 nm (200 GHz/100 GHz/50 GHz). Compared with CWDM channels, each consumes 20 nm (15 million GHz) of space, more wavelengths are multiplexed in on the same fiber. The current DWDM system can provide single-fiber transmission capacity of 16/20 waves or 32/40 waves, up to 160 waves, which increases the transmission capacity of an optical fiber several times to dozens of times compared with single-wavelength transmission, which greatly saves Optical fiber resources reduce the cost of line construction.

FWDM is a filter-type wavelength division multiplexing technology. Based on mature thin-film filter technology, it can combine or separate light of different wavelengths in a wide wavelength range. It has wide channel bandwidth, low insertion loss, high channel isolation and high Environmental stability and reliability, etc., are widely used in Erbium-doped fiber amplifier (EDFA), Raman fiber amplifier (RFA) and single-mode fiber communication systems.

MWDM is a medium wavelength division multiplexing technology, which reuses the first 6 waves of CWDM, compresses the 20nm wavelength interval of CWDM to 7nm, and uses TEC (Thermal Electronic Cooler, Semiconductor Refrigerator) temperature control technology to realize the expansion of 1 wave into 2 waves , that is, the left and right offset of 3.5nm is extended to 12 waves, which not only reuses the CWDM industry chain, but also meets the requirement of 10km fronthaul distance, and can further save optical fibers while achieving capacity improvement.

LWDM is a fine wavelength division multiplexing technology. It usually refers to one of the dense wavelength division multiplexing technologies that use four-wavelength division multiplexing technology in 100G optical modules. According to the LAN WDM wavelength defined by IEEE 802.3, its channel The interval is 200-800GHz, between DWDM (100GHz, 50GHz) and CWDM (about 3THz), using 12 wavelengths from 1269nm to 1332nm in the O-band (1260nm-1360nm) range, and the characteristics of the working wavelength are Near zero dispersion, the dispersion is small, the stability is good, the wavelength interval is 4nm, and the main coverage is 10km.

The five wavelength division multiplexing technologies are different, and the characteristics of optical modules using different WDM technologies are also different. As a professional fiber optic product manufacturer and comprehensive solution provider, FiberWDM provides comprehensive services, including custom design, installation, training, life-long maintenance services, and we can provide product samples, OEM and ODM services. Welcome to visit the official website for more information about related products.