Open AccessDigital suppression of both cross and inter-modulation distortion in multi-carrier RF photonic link with down-conversion
Author(s) -
Xiaodong Liang,
Yitang Dai,
Feifei Yin,
Xi Liang,
Jianqiang Li,
Kun Xu
Publication year - 2014
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.22.028247
Subject(s) - distortion (music) , modulation (music) , optics , spurious free dynamic range , intermodulation , compensation (psychology) , nonlinear distortion , photonics , out of band management , physics , signal (programming language) , cross phase modulation , phase modulation , telecommunications , computer science , dynamic range , bandwidth (computing) , phase noise , acoustics , psychology , amplifier , network architecture , computer security , psychoanalysis , network management station , programming language
We propose and demonstrate a novel scheme to effectively suppress the cross modulation distortion (XMD) and the third-order inter-modulation distortion (IMD3) which exist in wide-band, multi-carrier analog photonic link (APL) system. Such nonlinearities, which are caused by the out-of-band and in-band signals, respectively, constrain the link's performance severely. Instead of building an extra nonlinear path in hardware, the XMD and IMD3 compensation information is extracted from the received distorted signal, and both distortions are then suppressed by digitally multiplying the distorted signal with the compensation information. After compensation in the digital domain, the down-converted XMD and IMD3 distortions are experimentally suppressed with 33 dB and 25 dB, respectively, resulting in an improved upper limit for the SFDR.