Frequency domain equalization method based on dispersion overcompensation

Abstract

The invention discloses a frequency domain equalization method based on dispersion overcompensation, comprising the following steps: a step 1: performing optical modulation for a high-speed signal through a signal emission apparatus to obtain a modulated optical signal; a step 2: transmitting the modulated optical signal to a dispersion compensation device through an optical fiber, and performing dispersion compensation and equalization processing, wherein a compensation quantity of the dispersion compensation device is accumulation of an optical fiber compensation quantity and an overcompensation quantity, and a compensated and equalized optical signal is obtained; and a step 3: receiving the compensated and equalized optical signal through a signal receiving apparatus. In the frequency domain equalization method based on dispersion overcompensation, all-optical signal processing of dispersion compensation and frequency equalization is realized through an optical device, and usage of a high-speed electronic dispersion compensation module and an electrical frequency equalization algorithm is avoided.

Description

technical field [0001] The invention relates to the field of optical fiber communication, in particular to a method for high-speed signal long-distance transmission and frequency domain equalization based on a single dispersion compensation device. Background technique [0002] With the popularization and development of the Internet, communication data traffic is increasing year by year, the connection rate between the core network and the access network urgently needs to be upgraded to 100Gb / s, and the bandwidth bottleneck is shifted to the metropolitan area network. The increase of point-to-point system capacity can usually be achieved in two ways, that is, increasing the number of wavelengths and increasing the single-wavelength rate; among them, the single-wavelength rate increase is to be able to support higher transmission rates, which requires the transmitting and receiving devices to support higher High modulation and reception rates. Single-wavelength rate improvem...

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Problems solved by technology

The solution provided in this article requires offline digital signal processing, which cannot be applied in real time at present, and the transmission distance is limited and cannot be used for long-distance point-to-point transmission

[0009] Considering factors such as cost and performance, when increasing the capacity of an optical fiber communication system by increasing the single-wavelength rate, different types of optical networks usually use different schemes for signal transmission. The impact of dispersion will lead to pulse broadening, resulting in signal degradation. Therefore, for cost-sensitive systems such as short-distance interconnection and access networks, how to use low-cost devices and simple modulation and demodulation technology to achieve high-speed signal modulation and high-speed Dispersion management of signals so that they can support long-distance optical fiber transmission has become an urgent problem to be solved

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