DWDM - Dense Wavelength Division Multiplexing
WDM technology is a fiber communication
technology transmitting multiple optical carriers with information (analog or
digital) on one fiber.
WDM concept was first published in 1978, and by 1980 WDM systems were being realized in the laboratory. The first WDM systems combined only two signals. Modern systems can handle 160 signals and can thus expand a basic 200,100,10 Gbit/s across the metro, regional, long-haul, and ultra-long-haul DWDM system over a single fiber pair to over 16 Tbit/s. A system of 320 channels in also present (12.5 GHz channel spacing). 400G DWDM Prototype for Next Generation Ultra-Broadband Transmission possible also.
Compared to 100-Gbps
CP-QPSK, CP-16QAM modulation doubles the spectral efficiency, transmitting 200
Gbps per wavelength at the same baud rate while reducing unregenerated reach up
to 10000 KM.
Dense wavelength division multiplexing Concept:
DWDM Basic System:
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