| http://www.w3.org/ns/prov#value | - ction branches 611 and 621 on the upstream side can cancel each other. [0151] With the wavelength division demultiplexing apparatus according to the third embodiment of the present invention, since the distance between the nodes 24 between the input slab 2 and the channel waveguides 3 can be further reduced, the amount of loss caused by the gap portions (such portions as that denoted by reference
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