Accession Number : ADP007033

Title :   OTDR in Optical Amplifier Transmission Systems Using EDFAs Containing Optical Circulators,

Corporate Author : NIPPON TELEGRAPH AND TELEPHONE CORP TAKE TRANSMISSION SYSTEMS LABS

Personal Author(s) : Sato, Yoshiaki ; Nishi, Shigendo ; Aoyama, Koh-ichi

Report Date : 22 MAY 1992

Pagination or Media Count : 4

Abstract : Optical time domain reflectometry (OTDR) is an effective technique for locating breaks and for determining the loss distribution along a fiber 12. However, OTDR can not be used with optical transmission lines containing traditional Er-doped fiber amplifiers (EDFAs) because EDFAs require optical isolators to eliminate signal reflection (3)-(5). The returning backscattered light generated by the forward traveling probe pulse is blocked by optical isolators in each EDFA. In this paper, we proposed a new EDFA containing optical circulators, which support both OTDR and digital signal transmission. Experimental results demonstrate that OTDR fault location and and 1.8Gb/s digital signal transmission can be carried out in the same optical transmission line containing three EDFAS.

Descriptors :   *TRANSMISSION LINES, *AMPLIFIERS, *OPTICAL EQUIPMENT, DISTRIBUTION, FAULTS, FIBERS, LIGHT, PROBES, PULSES, SIGNALS, TIME, TIME DOMAIN, REFLECTOMETERS.

Subject Categories : Electrical and Electronic Equipment
      Fiber Optics and Integrated Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE