System design and long-span transmission experiments on an optical FSK heterodyne single filter detection system

Author

Emura, Katsumi ; Yamazaki, Shuntaro ; Shikada, Minoru ; Fujita, Sadao ; Yamaguchi, Masayuki ; Mito, Ikuo ; Minemura, Kouichi

Author_Institution

Opto-Electronics Research Labs, NEC Corporation, Kawasaki, Japan

Volume

5

Issue

4

fYear

1987

fDate

4/1/1987 12:00:00 AM

Firstpage

469

Lastpage

477

Abstract

The influence of LD phase noise on a heterodyne noncoherent detection system was evaluated. Based on the evaluation, an optical FSK heterodyne single filter detection system with large frequency deviation and wide-band IF filter has been developed to allow use of stand-alone DFB LD´s. In the system, a phase tunable DFB LD was used as an FSK transmitter light source to improve the FSK modulation characteristics. An IF filter with appropriate bandwidth evaded the influence of LD phase noise. With these configurations, long-span (243 km at 140 Mbit/s and 204 km at 280 Mhit/s) transmission experiments have been successfully carried out on this single filter detection system. To the contrary, influence of LD phase noise appeared in a limited IF bandwidth case, which agrees well with the theoretical evaluation.

Keywords

Distributed feedback (DFB) lasers; Frequency-shift keying; Heterodyning; IF systems; Optical fiber receivers; Bandwidth; Frequency shift keying; Optical filters; Optical mixing; Optical modulation; Optical noise; Optical transmitters; Phase detection; Phase noise; Wideband;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/JLT.1987.1075545

Filename

1075545