What is WDM? For example, easy to understand
WDM combines a series of optical signals with different information but different wavelengths and transmits them along a single fiber. At the transmitting end, they are combined by a multiplexer (also known as a combiner, MulTIplexer) and coupled to the light. a technique for transmitting in the same fiber of a line; at the receiving end, a demultiplexer (also called a demultiplexer or demultiplexer, DemulTIplexer) separates optical signals of different wavelengths, and then is separated by an optical receiver. Further processing to restore the original signal. In the same fiber, two or more optical wavelength signals are simultaneously transmitted through different optical channels, which is called optical wavelength division multiplexing (WDM).
Complex and difficult to understand? Don't worry, look at the simple example below and you will understand.
The Spring Festival is coming every year. Xiao Ming is ready to drive home. As a result, due to economic development, everyone has gone well and is ready to drive home. But the road can't widen more and more cars, and go back to the road like a turtle. Here Xiaoming is like a light signal. The main road is like the backbone fiber laid in optical communication. Because of the limited number, the single fiber transmission signal can no longer be satisfied. Growing communication needs).
At this time, Xiao Ming thinks that everyone can go to the high-speed rail together, it is fast and convenient (the high-speed rail originating station is like the combination of WDM wavelength division multiplexing technology, the optical signals are gathered together and coupled into the same light. transmission). After the high-speed train ran for a long distance, the supply was insufficient. After stopping to increase the supply, it was driven again, and soon after arriving at the destination, all the passengers were diverted to each other. (The replenishment in the middle is equivalent to the weakening of the signal after long-distance transmission of the optical signal; the increase of replenishment is equivalent to the enhancement of the optical signal after the weakening of the EDFA; the terminal of the high-speed rail is equivalent to the partial wave in the WDM wavelength division multiplexing technique. Separate various optical signals)
WDM wavelength division multiplexing technology can significantly improve the transmission capacity of optical fibers and improve the utilization of optical fiber resources. The most direct impact on life is that we go online, watch TV, make calls faster and more smoothly.
WDM wavelength division multiplexing technology, are you getting it?
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