Optical Transmission System-DWDM
Dense Wavelength Division Multiplexing (DWDM) is a Wave division multiplexing (WDM) technology that extends the transmission capacity of existing optical fiber networks. It multiplexes multiple optical carrier signals into a single fiber for transmission, which can save a lot of fiber resources in long-distance transmission applications. There are two main types of DWDM systems: passive DWDM system and active DWDM system.
Passive DWDM system
Passive DWDM system does not use active devices such as fiber amplifiers and dispersion compensators, and the transmission distance of this system is limited by the transmission power of the optical module. However, it has the advantage of high channel capacity, and is mainly used in metropolitan area networks and high-speed transmission lines with high channel capacity.
Active DWDM system
Active DWDM is a system that includes a transpiler, whose role is to perform an optoelectronic-optical (OEO) conversion. Active DWDM systems are also more complex to manage and maintain, so their operating costs are higher. Nonetheless, active DWDM systems are still widely popular for high-capacity optical transmission applications.
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