| 摘要 |
PROBLEM TO BE SOLVED: To solve such problem that etalon filters have a resonance of light since adjacent filters become parallel as the angles of the filters are adjusted. SOLUTION: This optical equalizer is equipped with a main body to which optical fibers can be connected, >=2 lenses which optically couple the optical fibers with each other, and >=2 etalon filters which are held by >=2 filter holders respectively and have mutual different free-spectrum areas, and when the holders are set in holder insertion holes of the main body, the filters held by the holders are arranged longitudinally between the >=2 lenses and able to rotate independently on axes of rotation orthogonal to the optical axis and planes formed by normal vectors of the two filters held by the adjacent holders when the holders are rotated are made neither the same nor parallel.
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