Fig.1 Outline of wavelength division multiplexing (WDM) transmission technology

Outline of wavelength division multiplexing (WDM) transmission technology

The WDM transmission is a multiple transmission method of the light signal, and it is done using the optical multiplexer and the optical demultiplexer.
The optical multiplexer multiplexes two or more light signals of different wavelengths by wavelength filters, and transmits those light signals on one optical fiber.
Besides, the optical demultiplexer separates two or more light signals of different wavelengths on one optical fiber by the wavelength filters.
In this system, signals from the sensor installed in each phase of power cable can be transmitted by only two optical fiber transmission lines by using WDM transmission technology.

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