Journal
OPTICS EXPRESS
Volume 18, Issue 15, Pages 15426-15439Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.18.015426
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Funding
- European Community [224547]
- Air Force Office of Scientific Research, Air Force Material Command, USAF [FA8655-09-1-3076]
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Based on semi-classical theory, the noise performance of a multispan fiber optical transmission system employing a cascaded phase-insensitive amplifier (PIA) and phase-sensitive amplifiers (PSAs) is investigated. Compared with the pure-PIA and pure-PSA based in-line amplification schemes, the copier + PSA scheme is found to improve the system NF by up to 6 and 3 dB, respectively, in an optimized long-haul fiber link. In addition, this cascaded configuration will significantly relax the requirement for accurate phase-and wavelength-locking which is rigorously needed in the pure-PSA configuration. This scheme is also modulation-format independent. As a proof of concept, the NF of a fiber parametric amplifier based copier + PSA cascade with inter-stage attenuation representing the fiber link is measured, which shows a 1.8-dB total NF improvement over the conventional EDFA cascade. (C) 2010 Optical Society of America
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