Passive DWDM System vs Active DWDM System
Dense Wavelength Division Multiplexing (DWDM) is a wavelength division multiplexing (WDM) technology that expands the transmission capacity of existing optical fiber networks. Save a lot of fiber resources in distance transmission applications. There are two main types of DWDM systems at present: passive DWDM systems and active DWDM systems.
1. Passive DWDM system
Active components such as fiber amplifiers and dispersion compensators are not used in passive DWDM systems. The transmission distance of this system will be limited by the transmit power of the optical module, but it has the advantage of high channel capacity and is mainly used in metropolitan area networks and high-speed networks. channel capacity in high-speed transmission lines.
2. Active DWDM system
Active DWDM is a system that includes repeaters that perform optical-electrical-optical (OEO) conversion. In addition, there are multiple erbium-doped fiber amplifiers (EDFA) in the system to ensure that the receiving end can receive high-quality optical signals, but the number of erbium-doped fiber amplifiers (EDFA) will be affected by the fiber type, the number of wavelength channels, Transmission rate, signal-to-noise ratio (OSNR) and other factors.
