FIELD: optical communication devices. SUBSTANCE: optical multiplexer/demultiplexer that may be used for spectral multiplexing of communication channels and for testing fiber-optic communication lines while transmitting signals at other wavelength has optically intercoupled common channel, beam splitter, focusing elements, and separate channels arranged in tandem for separate transmission of signals of different wavelengths. Beam splitter is made in the form of phase grating that has on period N equal-width steps whose height is found from formula given in description of invention. EFFECT: enhanced efficiency of device. 2 dwg
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