Intermodulation distortion (IMD) in Analog Radio-over-Fiber (a-RoF) poses a severe limitation to achievable error-free transmission. In this work, an optical feed-forward linearization scheme is presented and compared to an electrical pre-distortion solution. Both techniques show identical performance for intermodulation compensation of neighboring frequencies. The former suits wideband multi-carrier transmission better because it does not present limited operational bandwidth. Proof-of-concept experiments for reducing intermodulation and distortions are offered. A 5-dB improvement in the Error Vector Magnitude (EVM) distortion floor level is achieved. Trade-off between compensating for second and third harmonics was verified. Results indicate the solution allows maximal exploitation in a-RoF capacity.

光纤模拟无线电（a-RoF）中的互调失真（IMD）严重限制了可实现的无差错传输。在这项工作中，提出了一种光学前馈线性化方案，并将其与电预失真解决方案进行了比较。两种技术在相邻频率的互调补偿方面表现出相同的性能。前者更适合宽带多载波传输，因为它不存在有限的工作带宽。提供了用于减少互调和失真的概念验证实验。误差矢量幅度（EVM）失真基底水平提高了5dB。验证了在补偿二次谐波和三次谐波之间的取舍。结果表明该解决方案可以最大程度地利用a-RoF能力。