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Optica Publishing Group
  • Optical Fiber Communications Conference
  • OSA Trends in Optics and Photonics (Optica Publishing Group, 2002),
  • paper TuE4

Electronic Equalization of Transmission Impairments

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Abstract

More than one decade ago the discussion was stimulated to use post-detection electronic signal processing to mitigate penalty induced in the optical domain.1 Electronic equalization bears the potential of being seamlessly integrated in the receiver electronics thus leading to a cost-effective solution for penalty mitigation. Signal processing schemes well established in lower rate communications like voice channel modems or mobile radio have mainly been investigated for application to optical signal. They are feed-forward equalizer (FFE), also referred to as transversal filter, decision feedback equalizer (DFE), as well as a concatenation of both, as is illustrated in Fig. 1. Studies have been conducted on more powerful concepts relying on complex electrical signal processing2 or, as the Maximum-likelihood sequence detection (MLD), on delaying the decision and first analyzing the whole distorted signal sequence over a few bitslots.1,3 MLD exhibits the ultimate performance of electrical processing schemes.

© 2002 Optical Society of America

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