WDM for Optical Fiber Capacity Expansion

(PresseBox) ( China, )
WDM (Wavelength Division Multiplexing) provides an easy-to-implement solution for long-distance transmission of high-speed and large-capacity information, which would increase transmission capacity of the communication network.

The traditional optical transmission method is that one fiber can only transmit one wavelength signal in a single time, while WDM transmits several wavelengths of light simultaneously over a single optical fiber. WDM mainly realizes wavelength multiplexing and demultiplexing through a combiner and a splitter. At the transmitting end, signals of multiple wavelengths are multiplexed together by a combiner and coupled to the one same optical fiber for transmission; At the receiving end, the optical signals of different wavelengths are separated by a splitter to restore the original signal. The wavelength division multiplexer has both multiplexing and demultiplexing functions. In long-distance transmission, an optical amplifier is usually used to enhance the optical singal transmission to aviod minimum attenuation.

The index of characteristics of WDM includes insertion loss, return loss, polarization loss, channel isolation, operating temperature, etc. The two most important characteristics to be measured are insertion loss and isolation.Insertion loss refers to the attenuation caused by the insertion of WDM filter into the optical transmission system. The lower the insertion loss, the better.The isolation refers to the degree to which one channel signal interferes with another channel, and the higher the degree of isolation, the better.

Features:
Multiply the transmission capacity. The characteristics of WDM enable it to make full use of the bandwidth resources of the fiber, so that the transmission capacity of one fiber is increased by multiple times than that of a single wavelength. With a channel rate of 10 Gbit/s or 2.5 Gbit/s, the number of WDM channels can be can be up to more than 32, ensuring that the transmission capacity can reach 300~400Gbit/s.

Good compatibility.WDM has good compatibility with different signals. When transmitting signals with different properties such as image, data and voice, each wavelength is independent from each other and does not interfere with each other to ensure the transparency of transmission.

On the basis of not changing the existing basic network architecture, WDM allows you to expand capacity without replacing your existing infrastructure and with minimal, if any, service interruption.
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