Intensity-modulated directly received optical signal generating method and device and intensity-modulated directly received optical signal receiving method and device

Abstract

The invention relates to the field of communication, and discloses an intensity-modulated directly received optical signal generating and receiving method. The method comprises the steps that a digital signal generating end inserts a carrier into an original DMT signal to obtain a double-sideband first DMT signal; and then the first DMT signal is subjected to intensity modulation and filtering toobtain a single-sideband optical signal. Since the single-sideband signal is transmitted in the optical fiber link, the influence of optical fiber dispersion on power attenuation in the signal transmission process is effectively reduced, and the transmission distance is greatly increased.

Description

technical field

[0001] The present application relates to the field of communications, and in particular to an optical signal generation method, receiving method and device for intensity modulation direct reception. Background technique

[0002] With the popularization of coherent optical communication technology in the backbone network, the network traffic in the backbone network can already reach a capacity of more than 40 Tb / s. The current traffic bottleneck is mainly transferred to the metropolitan area network. The technical difficulty lies in the need for low-cost optical fiber transmission technology to realize the successful transmission of single-wavelength 100Gb / s optical signals on 100 kilometers of single-mode optical fiber. Among them, the low-cost requirement lies in This technology needs to be different from coherent optical transmission technology. The current scheme mainly uses intensity modulation and direct detection. Compared with coherent optical transmi...

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