Open AccessDynamic range improvement in analog photonic link by intermodulation-compensation receiver
Author(s) -
Feifei Yin,
Dan Tu,
Xiaodong Liang,
Yitang Dai,
Junyi Zhang,
Jianqiang Li,
Kun Xu
Publication year - 2015
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.23.011242
Subject(s) - intermodulation , spurious free dynamic range , dynamic range , optics , baseband , high dynamic range , physics , intensity modulation , photonics , optical link , nonlinear distortion , modulation (music) , bandwidth (computing) , phase modulation , telecommunications , computer science , amplifier , phase noise , optical fiber , acoustics
In this paper, a novel intermodulation-compensation optical receiver based on the bias-modulated photo detector (PD) is proposed and demonstrated to eliminate the third-order intermodulation (IMD3) for the intensity-modulation direct-detection (IMDD) analog photonic link. We directly extract the key nonlinear distortion from the distorted optical intensity by a low-pass optical receiver, which is used to modulate the home-made, high-speed PD with bias modulation. Inside the high speed PD, the distorted radio frequency (RF) band is mixed with the above extracted baseband signal, and the IMD3 elimination can be achieved. Our proposal is theoretically analyzed, and the performance of the bias-modulated PD is experimentally demonstrated. Spurious-free dynamic range (SFDR) of 123.4 dB within 1-Hz bandwidth is obtained with 18.1 dB improvement. A low-biased Mach-Zehnder modulator (MZM) is used, keeping a simple transmitter with an improved link gain. The proposed post linearization requires no digital processing, avoiding the high quantization noise.