Wavelength division multiplexer with fiber bragg gratings

摘要

Disclosed is a wavelength-division multiplexer for providing a plurality of optical-signal-transmitting channels by dividing an input-optical-signal band. The wavelength-division multiplexer includes an optical block for dividing the input-optical-signal band into a plurality of bragg wavelengths including side lobes and for accommodating a plurality of bragg-fiber gratings connected to each other in series, such that a peak of a side lobe is matched with the optical-signal-transmitting channel. An isolator is provided to shut off a part of the wavelengths of the input-optical-signal band, which is reflected from the bragg-fiber gratings. A planar waveguide-array-grating chip divides the input-optical-signal band, which is inputted from the optical-fiber block, into a plurality of channels. An output-terminal optical-fiber block is connected to an output terminal of the planar waveguide-array-grating chip.