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What is a Planar Lightwave Circuit?

What is a Planar Lightwave Circuit and where is it used?

Planar light wave circuit or in short PLC is a technology for manufacturing optical waveguides with the same process used for LSIs. Silica-based PLCs were originally developed by the Japanese telecommunication service provider, NTT (Nippon Telegraph and Telephone). Silica-based PLCs are now widely used in practical devices such as wavelength (de)multiplexers and optical switches in optical fiber communications systems.