Microwave signal optical fiber transmission method with high spectral efficiency and optimized power fading

Abstract

The invention discloses a microwave signal optical fiber transmission method with high spectral efficiency and optimized power attenuation, and the invention relates to the fields of optical communication and microwave technology. The method is shown in the accompanying drawings, including a laser, two radio frequency signals of I and Q routes, a polarization multiplexing Mach-Zehnder modulator, a single-mode optical fiber, a polarization beam splitter, a polarization controller, an optical coupler, a polarizer devices and photodetectors. The method uses two radio frequency signals to modulate the optical carrier in the upper sub-modulator of the polarization multiplexing Mach-Zehnder modulator, while the lower sub-modulator does not add radio frequency signals, the optical carrier is not modulated, and the phase of the optical carrier is adjusted through the polarization controller , recover the RF signal and optimize the power fading. The invention can transmit two-way signals at the same time, thereby improving the spectrum utilization rate. The receiving end optimizes the periodic power fading by adjusting the phase of the optical carrier.

Description

technical field [0001] The invention relates to the technical fields of optical communication and microwave technology, and mainly relates to microwave photonic links. Background technique [0002] Compared with the traditional copper coaxial analog link, microwave photonic link (MPL) has the advantages of low propagation loss, large bandwidth and electromagnetic interference, and provides a good solution for broadband wireless access network, remote antenna and cable TV plan. In addition, with the increasing demand for high data rate transmission, the link needs to transmit multiple vector signals simultaneously. [0003] In traditional MPL, multiple vector signals are modulated on optical carriers of different wavelengths, and the modulated optical signals are multiplexed by a wavelength division multiplexer (WDM) and transmitted in a single-mode fiber (SMF). However, these solutions are bulky and costly, requiring the use of costly components such as adjustable light so...

AI Technical Summary

Problems solved by technology

However, these solutions are bulky and costly, requiring the use of costly components such as adjustable light sources

Furthermore, in MPLs using coherent detection, expensive coherent receivers and laser sources are unavoidable

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