In the past five years, the research on heterodyne (or homodyne) and coherent optical fiber communications (hereafter called coherent optical communications) has expanded rapidly. This is principally because of the possibility of receiver- sensitivity improvement and the resulting repeaterseparation elongation (typically to 100 km at λ = 1.55 μm) and partly because of the possibility of frequency-division multiplexing (FDM) with very fine frequency separation (typically 10-100 GHz).

© 1986 Optical Society of America

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