FLAT WAVEGUIDE, MULTIPLEXING AND BRANCHING ELEMENT, AND CONNECTING PORT POSITION SETTING METHOD FOR PLANE WAVEGUIDE

摘要

PROBLEM TO BE SOLVED: To reduce a phase error as to light in any path in plural input and output ports. ;SOLUTION: The first and second input and output ports 16, 18 are provided in the first input and output face of a flat waveguide 10, five connecting ports 20, 22, 24, 26, 28 are provided in the second input and output face 15, and a product value given by multiplying the sum (D_i+D_i+1) of optical path lengthes along two lines linking the adjacent two connecting ports with the first input and output port 16 respectively, and the angle Δθ_i formed by the two lines together is made constant irrespective of combination of the adjacent connecting ports[(D_i+D_i+1)Δθ_i = constancy.;COPYRIGHT: (C)1999,JPO