OTDR in Optical Amplifier Transmission Systems Using EDFAs Containing Optical Circulators,
NIPPON TELEGRAPH AND TELEPHONE CORP TAKE TRANSMISSION SYSTEMS LABS
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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 1.8Gbs digital signal transmission can be carried out in the same optical transmission line containing three EDFAS.
- Electrical and Electronic Equipment
- Fiber Optics and Integrated Optics