Radio over fiber communication technology based on high linearity and dispersion resistance of bias control in high speed railway communication

Abstract

The invention provides radio over fiber communication technology with high linearity and dispersion resistance. The technology comprises the following steps: incident light carriers are evenly divided into two paths on a mother modulator of double parallel strength modulators to be transmitted on upper and lower arms of the mother modulator. The light carriers transmitted on the upper arm are modulated by radio frequency signals when passing by a sun strength modulator 1. The amplitudes of the radio frequency signals loaded on two electrodes of the sun strength modulator 1 are the same, the phase angles are respectively 102.27 degrees and 180 degrees, a certain bias voltage is loaded, so that the light signals transmitted on the upper arm of the sun strength modulator 1 deviates for 102.27 degrees relative to the lower arm. In addition, when the light carriers transmitted on the lower arm of the mother strength modulator pass by the sun strength modulator 2, no signal or bias voltage needs to be loaded, but a bias voltage needs to be loaded to the lower arm of the mother strength modulator, so that the light carriers transmitted on the lower arm shift for 245.26 degrees relative to the incident light carriers. Finally, the light signals modulated by the mother modulator are transmitted by an optical fiber and are detected. Therefore, the system has the properties of high linearity and dispersion resistance.

Description

technical field [0001] The invention relates to a light-borne wireless communication technology based on bias control to realize single-sideband modulation and nonlinear suppression, and the technology can be applied in high-speed railway communication. Background technique [0002] High-speed railway communication with high performance, wide bandwidth, and high-speed access is crucial for train positioning, train speed measurement, confirmation of train stability, and star-rated services that provide passengers with real-time voice, video, and even large-scale online game access . However, the traditional 450M wireless train dispatching system and the GSM-R railway digital mobile communication system have shortcomings such as small available bandwidth, weak error correction capability, low transmission rate, and susceptibility to Doppler frequency shift, so they cannot meet the current and future requirements. Requirements for high-speed railway communications with high pe...

AI Technical Summary

Problems solved by technology

Photonic signal processing technology requires the assistance of an optical processor, and it is currently difficult to be directly oriented to applications and integration

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