METHOD FOR PAIR IDENTIFICATION OF OPTICAL FIBER

摘要

PURPOSE:To suppress the application of residual distortion to the coat of an optical fiber without exerting influence to optical transmission characteristics upon an active line by using a light source in a wavelength area increasing an optical loss for bend as compared with the wavelength of a light source used for optical transmission for reference light. CONSTITUTION:A reference light source 3 having wavelength generating a loss larger than the increment of an optical loss for the bend 4 of an optical fiber in the wavelength area of the light source used for optical transmission and having a loss almost equal or less to/than the optical transmission loss of the optical fiber is used. A fiber 2-1 is bent, a photodetecting sensor 5 is arranged on a position in the range where a bent angle along the optical fiber 2-1 from the start of bend of the fiber 2-1 on the incident end side of the reference light source 3 in the direction reverse to the incident side of the light source 3 is pi/4-3 and pi/4 radian to identify the core 2-1 about the sensor 5. Consequently, the optical fiber can be identified without exerting influence to optical transmission characteristics upon an active line and without generating an extremely small bend such that residual distortion is applied to the coat of the optical fiber.