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Optical Coherent Detection and Digital Signal Processing of Channel Impairments

Living reference work entry

Abstract

In long-haul optical communications, it is generally desired to transmit the greatest data throughput over the longest distance, without signal regeneration if possible, at the lowest cost-per-bit. The capacity-distance product in b/s-km is an important metric in evaluating system performance. Total system capacity is the product of spectral efficiency (b/s/Hz) and the bandwidth (Hz) available for signal transmission. The usable bandwidth is constrained by the transparency region of glass and by the availability of cost-effective amplifiers. Dense wavelength-division multiplexing (DWDM) was an area of active research in the 1980s (Ishio et al. 1984; Brackett 1990). The invention of the erbium-doped fiber amplifier (EDFA) in the 1990s enabled repeaterless transmission over transcontinental and transoceanic distances (Desurvire 2002). Today, EDFAs facilitate long-haul optical fiber transmission in the C- (1530–1570 nm) and L- (1570–1610 nm) bands, giving a total utilizable bandwidth of around 10 THz.

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Copyright information

© Springer Nature Singapore Pte Ltd. 2018

Authors and Affiliations

  1. 1.NEC Laboratories AmericaPrincetonUSA

Section editors and affiliations

  • Chao Lu
    • 1
  1. 1.Department of Electronic and Information EngineeringPolytechnic University of Hong KongKowloonHong Kong

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