| 摘要 |
PROBLEM TO BE SOLVED: To provide a light output adjuster selecting a transmission band via the adjusting of the light incidence angle on an optical filter, surely compensating the optical path drift generated by the optical fiber with a simple structure, and capable of obtaining a high coupling efficiency. SOLUTION: An optical filter 5 transmitting and extracting the signal light in a specific wavelength band within the input signal light 3 combined with the signal light having multiple wavelengths is arranged between transmitting and receiving optical fibers 1a, 1b, a light transmitting plate 6 is arranged behind the optical filter 5, and the optical filter 5 is rotated by gears 7, 8 with respect to the input signal light 3 according to the wavelength band to be transmitted. The light transmitting plate 6 is rotated in the opposite direction to the optical filter 5, and the optical path drift generated by the optical filter 5 is corrected by the light transmitting plate 6. |
