Microwave signal optical fiber transmission method with high spectral efficiency and capable of optimizing power fading

Abstract

The invention discloses a microwave signal optical fiber transmission method with high spectral efficiency and capable of optimizing power fading, and relates to the technical field of optical communication and microwaves. As shown in an attached drawing, the method involves a laser, an I-path radio frequency signal, a Q-path radio frequency signal, a polarization multiplexing Mach-Zehnder modulator, a single-mode optical fiber, a polarization beam splitter, a polarization controller, an optical coupler, a polarizer and a photoelectric detector. According to the method, two paths of radio frequency signals are used for modulating an optical carrier in an upper sub-modulator of the polarization multiplexing Mach-Zehnder modulator, a radio frequency signal is not added to a lower sub-modulator, the optical carrier is not modulated, the phase of the optical carrier is modulated through a polarization controller, the radio frequency signal is recovered, and power fading is optimized. Two paths of signals can be transmitted at the same time, and the spectrum utilization rate is improved. 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 Program. 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...

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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