| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a half-band optical signal processing uint whose circuit constitution is not redundant and also in which the degree of freedom of a design is large. SOLUTION: In this optical signal processing unit, two lines of optical waveguides 21, 22 are coupled with N pieces of optical couplers 23-0 to 23-(N-1) or 23-1 to 23-N while having the difference 2L of optixal path lengths and also emitting sides of optical signals or incident sides of the optical singnals of the optical waveguides 21, 22 are connected with a 3 dB optical coupler 25 while having the difference L of optical path lengths and more-over, phase shifters 24-1 to 24-N are provided at least one side of N places on the optical waveguides 21, 22 held among these optical couplers.</p> |
