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28 April 1995 M-ary ASK coherent detection systems employing photonic amplifiers
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Coherent optical-fiber communication systems that are used in conjunction with multiple in- line optical amplifiers are very important for achieving point to point long distance communication as well as compensation of tap-losses in distribution networks. In this paper, the performance of in-line heterodyne synchronous detection type of coherent optical fiber communication systems for binary and M-ary ASK signaling schemes are investigated. This extends the previously published results on ASK asynchronous demodulation in the presence of optical amplifiers in cascade. The local oscillator spontaneous emission beat noise is the dominant source of noise in these systems. Expressions for bit error rate are derived and compared with the case where no amplifier is used. The results show that the value of optical amplifier input power significantly affects the system performance. Bit error floors are observed at about 10-9 for the total spontaneous emission parameter nsp equals 55 for binary synchronous ASK signal detection and nsp equals 20 and 8 for 4-ASK and 8- ASK signalling schemes when the amplifier input power is assumed to be -35 dBm at a bit rate of 1.2 Gb/sec.
© (1995) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Fatima N. Farokhrooz, Hussain Arbab Tafti, and J. P. Raina "M-ary ASK coherent detection systems employing photonic amplifiers", Proc. SPIE 2382, Laser Diodes and Applications, (28 April 1995);

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