Optical link linearization method

Abstract

The invention discloses an optical link linearization method. The optical link linearization method comprises step 1, obtaining an optical signal from an optical link and detecting and recovering a distorted electrical signal from the optical signal; step 2, building a compensation signal according to the distorted electrical signal; step 3, performing compensation on the distorted electrical signal through the compensation signal so as to enable the optical link to be linearized. According to the optical link linearization method, the optical link is an incoherent intensity modulation direct detection link and the simultaneous inhibition of IMD3 (Third-order Intermodulation Distortion) and XMD (Cross-over Modulation Distortion) is implemented by an optical down-conversion and digital post-processing combined nonlinear compensation algorithm; the operation complexity of the existing coherent detection technology experiment is reduced and the system stability is increased; meanwhile the accurate estimation on link parameters or the careful construction on a compensation light path when nonlinear compensation signals are established in a digital domain in the existing technical scheme is avoided and the implementation difficulty of the existing nonlinear inhibition algorithm is simplified.

Description

technical field [0001] The invention relates to the technical field of optical communication, in particular to an optical link linearization method. Background technique [0002] The analog optical link has significant advantages such as low power consumption, high bandwidth, and anti-electromagnetic interference. It has emerged in the research of generating, distributing, controlling, and processing radio frequency signals, and has been actively explored by researchers at home and abroad. Photon technology has inherent and unique advantages in processing ultra-wideband, high-frequency and multi-carrier signals. However, most analog optical links inevitably include electrical-optical conversion and optical-electrical conversion modules, and the resulting nonlinearity seriously limits the performance of the link. Harmonic Distortion (HD) and carrier in-band intermodulation distortion (third-order Intermodulation Distortion, IMD3) ) and inter-carrier intermodulation distorti...

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Problems solved by technology

At the same time, there will be a very strict synchronization problem between the distorted signal and the compensated signal. Any phase offset may lead to the failure of the scheme, which increases the complexity and difficulty of the experimental operation.

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