Improvement of Optically Generated Adjacent Channel Interference in RoF Systems

Author

Wei, F. ; Li, Sinan ; Zheng, Xiaoquan ; Zhang, Haijun ; Zhou, B.

Author_Institution

Laboratory of Optical Networking and Microwave Photonics, State Key Laboratory on Integrated Optoelectronics, Tsinghua National Laboratory for Information Science and Technology, Department of Electronic Engineering, Tsinghua University, Beijing, China

Volume

25

Issue

12

fYear

2013

fDate

15-Jun-13

Firstpage

1137

Lastpage

1140

Abstract

The optically generated adjacent channel interference (O-ACI) issue in the wavelength-reuse multi-channel radio-over-fiber systems is first studied. It is generated by the re-modulation of a downlink optical signal, which is already modulated by the downlink microwave signal. A carrier amplitude-phase-control double sideband modulation is proposed and experimentally demonstrated to improve the O-ACI in such systems. By tuning the bias voltage of the main modulator of the dual parallel Mach–Zehnder modulator, the amplitude and phase of the optical carrier are controlled to improve the O-ACI. Experiments show that the O-ACI in wavelength-reuse multi-channel WIFI-over-fiber system is reduced for 8 dB and the power penalty due to the O-ACI is improved by at least 5 dB when EVM is 6%.

Keywords

Optically generated adjacent channel interference (O-ACI); radio-over-fiber (RoF); wavelength-reuse;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2013.2261810

Filename

6514090