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Conference on Lasers and Electro-Optics

Reduction of pattern dependent distortion on data in an SBS-based slow light fiber element by detuning the channel away from the gain peak

T. Luo, L. Zhang, Wenqiong Zhang, Changyuan Yu, Sudeng Hu, Alan Eli Willner

Published Jan 1, 2006• 5 citations
Publisher

Abstract

We experimentally study reduction of pattern dependent gain and delay for data through SBS-based slow light element by detuning the channel away from the SBS gain peak. The Q factor increases from 1.3 to 11.2.
DOI
10.1109/cleo.2006.4627954

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Slow-light components will degrade the data bits in an optical communication system due to narrow-band amplitude and phase responses. A bit-pattern dependence is produced in the output data stream. These effects are observed in simulation as well as in an experiment based on slow light induced by stimulated Brillouin scattering (SBS) in an optical fiber. We define figure of merit involving pulse delay and data degradation to optimize slow-light components. It is demonstrated experimentally and numerically that the pattern dependence can be reduced by detuning the slow-light devices.
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Slow light has been proposed as a potential solution to all-optically tunable delay line. However, a slow-light element may degrade data quality in an optical communication system while decreasing group velocity of optical pulses. In this paper, pattern dependence of signal distortion is identified as a main reason for data degradation, which is caused by narrow-band amplitude and phase responses of the slow-light elements. We define figure of merit involving pulse delay and data degradation to optimize slow-light devices. It is shown that the pattern dependence can be reduced by detuning slow-light devices away from the signal carrier frequency, which allows using narrow-band slow-light techniques to increase normalized delay up to 0.8, withQQQimprovement of 2 dB.