Generation method of high baud rate optical signal based on spectrum cutting and double ssb modulation

Abstract

The invention provides a method for generating a high-baud-rate optical signal based on frequency spectrum cutting and dual-SSB modulation. The generation method comprises the following steps: the transmitted high-baud-rate digital signals are cut into two parts of a high-frequency signal and a low-frequency signal in a frequency spectrum segmentation mode, and preprocessing is carried out on thehigh-frequency signal and the low-frequency signal respectively; the preprocessed high-frequency signal and the preprocessed low-frequency signal are respectively introduced into a coupler for coupling, so that two single-side band signals are formed respectively; after being respectively loaded with an electric auxiliary carrier signal, the two coupled single-side band signals are input to a modulator for modulation, and combined to form a virtual single-side band signal; the virtual single-side band signal is transmitted and received through an optical fiber, thereby carrying out subsequentdigital signal processing. According to the method, the signal frequency spectrum is segmented and modulated respectively, so that small electric bandwidth is used at a transmitting end, the generation and transmission of the high-speed optical signals are realized, and the system cost is remarkably reduced.

Description

technical field [0001] The invention relates to the technical field of optical communication, in particular to a method for generating a high baud rate optical signal based on spectrum cutting and double SSB modulation. Background technique [0002] With the rapid development of mobile Internet and data center network services, there is a demand for large-capacity and ultra-high-speed optical fiber communication transmission in short- and medium-distance communication scenarios. For the aforementioned short-to-medium-distance optical communication systems, how to achieve ultra-high-speed signal transmission in systems with limited bandwidth of optoelectronic devices, such as single-wavelength single-polarization signal transmission above 200Gb / s, has become a hot issue in the industry. [0003] The generation of existing ultra-high-speed signals mainly relies on DAC to generate directly or use RF power combiner to combine low-order signals to generate. For example, high-spee...

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Problems solved by technology

But in this case, in order to achieve high baud rate or high-order modulation format optical signal, ultra-high-speed DAC or high-bandwidth RF power combiner and high-performance linear RF electronic power amplifier are required, and these devices will significantly increase the system cost

[0004] At present, in the pulse amplitude modulation PAM signal, which has great application potential in short-to-medium distance systems, real-time ASIC chips for 60GBaudPAM-4 signals are currently available, but with current commercial devices and equipment (DAC100Gsa / s sampling rate, 40GHz bandwidth) , temporarily unable to achieve PAM signal generation and transmission above 200Gb / s

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