On the validity of using CW tones to test the linearity of multichannel M-QAM subcarrier multiplexed lightwave systems

Author

Wu, Ming-Chia ; Chiang, Pi-Yang ; Way, Winston I.

Author_Institution

Dept. of Commun. Eng., Nat. Chiao Tung Univ., Hsinchu, Taiwan

Volume

12

Issue

4

fYear

2000

fDate

4/1/2000 12:00:00 AM

Firstpage

413

Lastpage

415

Abstract

We investigate the validity of using multiple continuous-wave (CW) tones as the signal source to test the linearity of a multichannel M-ary quadrature-amplitude-modulation (M-QAM) subcarrier multiplexed lightwave system. We consider the following representative optical fiber system nonlinearities: 1) laser clipping and 2) the combined effect of laser frequency chirp and fiber dispersion. Our results show that if all orders of nonlinear distortions (NLDs) in a signal bandwidth are included in the total NLD power, the error caused by replacing M-QAM signals with CW tones can be within measurement uncertainty.

Keywords

measurement uncertainty; nonlinear optics; optical fibre dispersion; optical fibre networks; optical fibre testing; quadrature amplitude modulation; subcarrier multiplexing; CW tones; fiber dispersion; laser clipping; laser frequency chirp; linearity; measurement uncertainty; multichannel M-QAM subcarrier multiplexed lightwave systems; multichannel M-ary quadrature-amplitude-modulation subcarrier multiplexed lightwave system; multiple continuous-wave tones; nonlinear distortions; optical fiber system nonlinearities; signal bandwidth; signal source; total NLD power; Chirp; Fiber lasers; Frequency; Laser noise; Linearity; Nonlinear distortion; Optical fiber dispersion; Optical fiber testing; Optical fibers; System testing;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/68.839036

Filename

839036