Operation of a passive optical network with subcarrier multiplexing in the presence of optical beat interference

Author

Wood, T.H. ; Shankaranarayanan, N.K.

Author_Institution

Crawford Hill Lab., AT&T Bell Labs., Holmdel, NJ, USA

Volume

11

Issue

10

fYear

1993

fDate

10/1/1993 12:00:00 AM

Firstpage

1632

Lastpage

1640

Abstract

When two lasers carrying subcarrier-multiplexed data operate with very closely spaced wavelengths, beating between the lasers can occur which increases the noise at the detector. This effect, optical beat interference (OBI), can greatly interfere with the operation of these systems. The authors have observed OBI with DFB lasers in a system carrying two 155.5-Mb/s data streams. With an optical modulation index of m=0.8, a bit-error rate floor of approximately 10^-2 was observed due to OBI, which is consistent with the noise measured by an RF power meter. When m is increased to 1.8, a significant reduction in OBI was observed, and it was possible to achieve transmission at the 10 ^-9 level with a penalty of only 1.8 dB due to the presence of OBI

Keywords

distributed feedback lasers; light interference; optical links; optical modulation; semiconductor device noise; subcarrier multiplexing; 155.5 Mbit/s; RF power meter; closely spaced wavelengths; detector noise; it-error rate floor; lasers; optical beat interference; optical modulation index; passive optical network; subcarrier multiplexing; subcarrier-multiplexed data; Degradation; Frequency; Intelligent networks; Interference; Laser noise; Optical fiber networks; Optical noise; Optical receivers; Passive optical networks; WDM networks;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/50.249905

Filename

249905