Journal
OPTICS EXPRESS
Volume 22, Issue 7, Pages 8120-8125Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.22.008120
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Funding
- China Scholarship Council
- Science Foundation Ireland [09/IN.1/I2653, 10/CE/I1853]
- Higher Education Authority PRTLI 4
- Higher Education Authority PRTLI 5
- INSPIRE Programs
- CTVR Grant
- Science Foundation Ireland (SFI) [09/IN.1/I2653] Funding Source: Science Foundation Ireland (SFI)
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We present experimentally and analytically the phase noise characterization of an externally injected gain switched comb source. The results reveal the residual high frequency FM noise in the comb lines, which stays unnoticed in the optical linewidth value but leads to an increased phase-error variance. The potential impact of the residual phase noise is investigated in a 10.7 GBaud optical DQPSK system where a 2 dB power penalty is recorded at BER of 10(-9). In a 10.7 GBaud digital coherent QPSK system no penalty is observed but with 5 GBaud 16-QAM format a 3 dB penalty exists at the FEC limit of 4.4e-3. (C) 2014 Optical Society of America
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