Journal article
Linearization of Direct Detection Optical Channels Using Self-Coherent Subsystems
Di Che, Qian Hu, William Shieh
JOURNAL OF LIGHTWAVE TECHNOLOGY | IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC | Published : 2016
Abstract
Intensity modulation with direct detection (IM-DD) dominates the commercial short-reach optical communications. However, when upgrading the data-rate distance product to 1000 Gb/s·km per wavelength and beyond, IM-DD faces severe performance barrier. Although a linear mapping exists between the intensity of transmitter and receiver in IM-DD back-to-back system, it becomes nonlinear under fiber channel impairments; for instance, the dominant chromatic dispersion. Coherent detection overcomes this fundamental obstacle by recovering a linear replica of the optical field instead of intensity. The local oscillator provides a reference carrier which mixes with the received signal, from which both i..
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