Wavelength Division Multiplexing

Wavelength Division Multiplexing Technology WDM (Wavelength Division Multiplexing)

Wavelength division multiplexing uses the same fiber to transmit multiple optical signals of different wavelengths to improve the transmission capacity of a single fiber. Because the light source of optical communication only occupies a very narrow part of the "window" of optical communication, there is still a large area that is not used.

WDM can also be considered as a variant of FDM applied to Fibre Channel. If optical signals with different wavelengths are transmitted on the same optical fiber without interfering with each other, the information capacity can be increased by using multiple light sources with appropriately staggered wavelengths to transmit their respective information on one optical fiber at the same time. Since different wavelengths are used to transmit their respective information, they will not interfere with each other even on the same fiber. When converted into electrical signals at the receiving end, the information transmitted by each light source of different wavelengths can be independently maintained. This method is called "wavelength division multiplexing".

If a series of optical carriers of different wavelengths carrying information are combined and transmitted along a single optical fiber with a wavelength interval of 1 to several hundred nanometers in the optical field, and then a certain method is used at the receiver to convert the different wavelengths. the optical carrier separately. Arranging 100 light sources with different wavelengths on the working window on the optical fiber and transmitting the information carried by each on one optical fiber at the same time can increase the capacity of the optical fiber communication system by 100 times.