Optical single sideband modulation method capable of dynamically adjusting carrier-to-sideband ratio based on dual-polarization modulator

Abstract

The invention discloses an optical single sideband modulation method capable of dynamically adjusting a carrier-to-sideband ratio based on a dual-polarization modulator, and relates to the technical field of optical communication and microwave. The method is as shown in the attached pictures, and relates to a laser source, a radio frequency signal source, a power phaser, a dual-polarization modulator, a polarization controller and a polarizer. By adoption of the method, a polarization multiplexing optical single sideband modulation signal is acquired by the dual-polarization modulator; and, the carrier-to-sideband ratio of the optical single sideband modulation signal can be flexibly adjusted by adjusting the polarization controller. The single sideband signal generated by the method can be applied to a radio frequency communication system over fiber; the problem that a periodic power fading is caused by the fiber dispersion when the signal is transmitted in a long distance is solved;and the transmission performance of the system is greatly improved by selecting the proper carrier-to-sideband ratio. Moreover, the method is simple in structure, has no selectivity for the wave length of the optical carrier, and has tenability for the broadband.

Description

technical field [0001] The invention relates to the field of optical communication and the field of microwave photon technology, in particular to a high-performance signal modulation method in optical radio frequency communication, that is, optical single sideband modulation with dynamically adjustable carrier sideband ratio. Background technique [0002] Traditional microwave technology has electronic bottlenecks in terms of processing speed and transmission bandwidth, and has a large loss in long-distance transmission of high-frequency signals, while traditional optical fiber technology is not mobile enough. A fusion technology, in which microwave technology provides low-cost mobile wireless connection, optical fiber technology provides low loss, large capacity and anti-electromagnetic interference transmission characteristics, aims to overcome the shortcomings of traditional microwave technology and traditional optical fiber technology, and greatly improve microwave Syste...

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Problems solved by technology

[0005] In order to overcome the limited, expensive and complex shortcomings of the radio frequency signal bandwidth of the above scheme, the present invention introduces a simple method to realize the modulation method, based on the optical single sideband modulation method with dynamically adjustable carrier sideband ratio of the dual polarization modulator, In this method, the upper sub-modulator of the dual polarization modulator is used to realize the single sideband modulation of the radio frequency signal, and the lower sub-modulator realizes the output of the optical carrier. After the output optical carrier passes through the 90° polarization rotator, the upper and lower signals are polarized The optical single sideband modulation signal is combined by the polarizer into the orthogonal polarization multiplexed optical single sideband modulation signal. The signal enters the polarizer through the polarization controller and is converted into a linearly polarized signal. By adjusting the polarization controller, the carrier-to-sideband ratio of the output signal can be changed.

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