High-linearity multichannel radio over fiber communication link system and linearity optimization method

Abstract

The invention relates to a high-linearity multichannel radio-over-fiber communication link system and a linearity optimization method, a microwave photon technology and a Lagrange multiplier method optimization technology are combined, and the inherent advantages of large bandwidth, high frequency and electromagnetic interference resistance of the microwave photon technology are utilized to carry out modeling optimization on parameters influencing the linearity of the system, so that the linearity of the system is optimized. According to the method, a laser, a polarization multiplexing Mach-Zehnder modulator, a polarization controller, a polarizer, a photoelectric detector and other devices are utilized, the polarization incident angle is changed only by using the polarization controller, and the optimal working point of the system is solved, so that the nonlinear distortion of a link is reduced, and the stray-free dynamic range and the bandwidth of the system are improved. Therefore, suppression of third-order intermodulation distortion and second-order harmonic distortion can be realized, and the device has the advantages of high linearity, large bandwidth, compact structure and simple operation.

Description

technical field [0001] The invention relates to the technical field of communication links, in particular to a high-linearity multi-channel optical wireless communication link system and a linearity optimization method. Background technique [0002] Carrier wireless communication technology uses optical fiber to transmit and distribute radio frequency signals, which can overcome the electronic bottleneck of high loss, low frequency and narrow bandwidth of traditional microwave systems, and has become an emerging key enabling technology. In recent years, with the continuous growth of broadband wireless services and intelligent terminal equipment, fiber-borne wireless communication technology has been widely used in distributed antenna systems (DAS) due to its outstanding advantages such as low loss, large bandwidth, high transmission rate, and strong anti-electromagnetic interference. It has been widely used and has become an ideal and effective solution to replace microwave ...

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Problems solved by technology

[0003] In view of the above situation, at present, the proposed linearization scheme based on microwave photonic technology either can only suppress the third-order intermodulation distortion or the second-order harmonic distortion, or has the disadvantages of difficult implementation, complex structure and large practical application limitations.

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