Fiber Dispersion and Nonlinearity Influences on Transmissions of AM and FM Data Modulation Signals in Radio-Over-Fiber System

Author

Qi, Xiaoqiong ; Liu, Jiaming ; Zhang, Xiaoping ; Xie, Liang

Author_Institution

State Key Lab. on Integrated Optoelectron., Chinese Acad. of Sci., Beijing, China

Volume

46

Issue

8

fYear

2010

Firstpage

1170

Lastpage

1177

Abstract

Transmission properties of data amplitude modulation (AM) and frequency modulation (FM) in radio-over-fiber (RoF) system are studied numerically. The influences of fiber dispersion and nonlinearity on different microwave modulation schemes, including double side band (DSB), single side band (SSB) and optical carrier suppression (OCS), are investigated and compared. The power penalties at the base station (BS) and the eye opening penalties of the recovered data at the end users are both calculated and analyzed. Numerical simulation results reveal that the power penalty of FM can be drastically decreased due to the larger modulation depth it can achieve than that of AM. The local spectrum broadening around subcarrier microwave frequency of AM due to fiber nonlinearity can also be eliminated with FM. It is demonstrated for the first time that the eye openings of the FM recovered data can be controlled by its modulation depths and the coding formats. Negative voltage encoding format was used to further decrease the RF frequency thus increase the fluctuation period considering their inverse relationship.

Keywords

microwave photonics; modulation coding; nonlinear optics; optical fibre dispersion; optical fibre networks; optical fibre testing; optical pulse compression; optical transmitters; radio networks; radio-over-fibre; spectral line broadening; RF frequency; base station; data amplitude modulation; data frequency modulation; double side band; fiber dispersion; fiber nonlinearity; microwave modulation; negative voltage encoding format; optical carrier suppression; optical fiber transmission; power penalties; radio-over-fiber system; single side band; spectrum broadening; subcarrier microwave frequency; Amplitude modulation; Base stations; Encoding; Frequency modulation; Microwave frequencies; Modulation coding; Numerical simulation; Optical modulation; Radio frequency; Voltage; Amplitude modulation (AM); double side band (DSB); frequency modulation (FM); optical carrier Suppression (OCS); radio-over-fiber (RoF); single side band (SSB);

fLanguage

English

Journal_Title

Quantum Electronics, IEEE Journal of

Publisher

ieee

ISSN

0018-9197

Type

jour

DOI

10.1109/JQE.2010.2044747

Filename

5446452