SENSOR AND SIGNAL DETECTING METHOD OF OPTICAL FIBER INTERFERENCE TYPE, VIBRATION SENSOR AND VIBRATION DETECTING METHOD OF OPTICAL FIBER INTERFERENCE TYPE, PAIR IDENTIFIER AND IDENTIFYING METHOD FOR OPTICAL FIBER CABLE, PAIR IDENTIFIER AND IDENTIFYING METHOD FOR COATED OPTICAL FIBER, AND DEVICE AND METHOD FOR OPTICAL FIBER TELEPHONE CALL

摘要

PROBLEM TO BE SOLVED: To provide the coated optical fiber pair identifier which can accurately identify a coated optical fiber with simple constitution and enables a bidirectional continuous telephone call by using the collated coated optical fiber. ;SOLUTION: An optical transmission and reception unit 201 is connected to one-side ends of two coated optical fibers 202A and 202B, which are looped by connecting the other-side ends to each other; and a local unit 203 is installed nearby the other-side ends. While the local unit excites the coated optical fibers, a light signal is propagated from the side of the optical transmission and reception unit and the optical fiber identification is performed according to whether or not a vibration signal is found in variation in the intensity of interference light between clockwise propagated light and counterclockwise propagate light which have returned. Further, a telephone call is made between the optical transmission and reception unit and local unit through the identified optical fiber.;COPYRIGHT: (C)2000,JPO