Study of Long-Haul Transmission Systems Using Erbium-Doped Fiber Amplifiers

circulating loop transmission experiment is a useful tool for the research and development of long-haul transmission systems that use Erbium-doped fiber-amplifier repeaters. Circu- lating loop techniques, applied to an amplifier chain of modest length, can provide an experimental platform to study a broad range of transmission phenomena for EDFA-based transmission systems. A loop experiment attempts to simulate the transmis- sion performance of a multi-thousand kilometer long system by reusing or recirculating an optical signal through a modest length amplifier chain of tens to hundreds of kilometers. This paper reviews original loop techniques developed to study vari- ous parameters of long-haul transmission using Erbium-doped fiber-amplifiers repeaters for undersea systems. Transmission experiments were performed at transoceanic distances with 33 and 46 km amplifier spacing, operating at 5 and 10 Gbls. Experimental data is provided here for various parameters, including bit error ratio, Q-factor, and spectral broadening.

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