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What is the structure principle of wavelength division multiplexing system?

Optical wavelength division multiplexing is a technology that transmits multi-wavelength optical signals in one optical fiber. The basic principle is to combine (multiplex) optical signals of different wavelengths at the transmitting end, couple them to the same optical fiber on the optical cable line for transmission, and separate (demultiplex) the optical signals of the combined wavelengths at the receiving end. , and further processed, the original signal is recovered and sent to different terminals.

WDM wavelength division multiplexing is not a new concept. At the beginning of the appearance of optical fiber communication, people realized that the huge bandwidth of optical fiber can be used for wavelength multiplexing transmission, but before the 1990s, there was no major breakthrough in this technology. Rapid development From 155Mbit/s to 622Mbit/s to 2.5Gbit/s System TDM rate has been quadrupling over the past few years People rarely pay attention to another technology when one technology is going fast Around 1995 An important reason for the turning point in the development of the WDM system is that people encountered setbacks in the TDM 10Gbit/s technology at that time, and many eyes focused on the multiplexing and processing of optical signals. Only then did the WDM system have a wide range of applications around the world. .

Post time: Jun-20-2022