OPTICAL MULTIPLEXER/DEMULTIPLEXER

摘要

PROBLEM TO BE SOLVED: To embody an optical multiplexer/demultiplexer which is totally small in crosstalks by connecting the respective input/output ports of a first wavelength separating element and the respective input/output ports of a second wavelength separating element so as to satisfy specific conditions. SOLUTION: The array waveguide diffraction gratings(AWG) comprising an input waveguide 11, an input side concave slab waveguide 12, an array waveguide 13, an output side concave slab waveguide 14 and an output waveguide array 15 are similar to the conventional array waveguide diffraction gratings. The wavelength separating element 16 varying in the transmission wavelengths between the respective input/output ports from each other is inserted into the output waveguide array 15 and is so set that the wavelengths branched to the respective wavelengths of the output waveguide array 15 and the transmission wavelengths between the respective input/output ports of the wavelength separating element 1 are so set as to coincide with each other. Both wavelength separating elements are thus connected in such a manner that the wavelengths (optical frequencies) branched to the respective input/output ports of the first wavelength separating element and the transmission wavelengths (optical frequencies) between the respective input/output ports of the second wavelength separating element 16 respective coincide with each other.