LIGHT FILTER, INTERLEAVER, AND OPTICAL COMMUNICATION SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a light filter excellent in isolation.

SOLUTION: Light inputted from a primary optical path P1 of a light filter 200 is branched and outputted into a second optical path P2 and a third optical path P3. Light inputted into a 2nd beam splitter 221 from the 2nd optical path P2 is branched and outputted into a 5th optical path P5 and a 6th optical path P6. Light outputted to the 5th optical path P5 goes back and forth at a primary reflecting mirror 222 and returns to the 2nd beam splitter 221, light outputted to the 6th optical path P6 goes back and forth at a 2nd reflecting mirror 223, and returns to the 2nd beam splitter 221, and each light is branched out and one light is outputted to the 2nd optical path P2. Light inputted into a primary beam splitter 211 from the second optical path P2 is branched and outputted into the primary optical path P1 and a 4th optical path P4. Light outputted to the 3rd optical path P3 goes back and forth at a 3rd reflecting mirror 232, and returns to a primary beam splitter 211 and branched and outputted into the primary optical path P1 and the 4th optical path P4.

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