Abstract

A postcompensation technique for nonlinearity of a Mach–Zehnder modulator in a radio-over-fiber (ROF) system is proposed and experimentally demonstrated based on second-order optical sideband processing and optical carrier band attenuation. The phase of the second-order optical sideband is shifted to suppress the third-order intermodulation distortion (IMD3) in a direct detection ROF link. The optical carrier band is attenuated to make two kinds of origins of IMD3 have equal intensity and cancel each other out. A spurious-free dynamic range of 124.8dB·Hz2/3 is achieved, which is about 25 dB more than that without compensation.

© 2012 Optical Society of America

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