Why FSK and CPFSK have identical linewidth requirements

Author

Hooijmans, Pieter W. ; Tomesen, Mark T. ; Mols, Peter P G ; Depovere, Geert F G ; Van Gils, RenC A J C M

Author_Institution

Philips Res. Lab., Eindhoven, Netherlands

Volume

12

Issue

8

fYear

1994

fDate

8/1/1994 12:00:00 AM

Firstpage

1412

Lastpage

1422

Abstract

CPFSK is the most widely used modulation scheme in coherent optical transmission. Theoretical analyses so far predicted a much more stringent linewidth requirement compared to ASK and FSK systems with noncoherent IF-detection. In this paper we present a unified linewidth analysis of ASK, FSK, CPFSK, and DPSK receivers, with leads to the conclusion that the linewidth performance of these different schemes is to a large extent identical. The inclusion of post-detection filtering in the analysis is critical for obtaining these results, which are supported by practical system measurements on a 1 Gbit/s phase diversity CPFSK receiver

Keywords

frequency shift keying; optical modulation; optical receivers; phase shift keying; spectral line breadth; 1 Gbit/s; ASK; CPFSK; DPSK receivers; FSK; coherent optical transmission; linewidth requirements; modulation scheme; phase diversity CPFSK receiver; post-detection filtering; unified linewidth analysis; Amplitude shift keying; Delay; Differential quadrature phase shift keying; Frequency shift keying; Laser noise; Optical feedback; Optical filters; Optical noise; Optical receivers; Optical transmitters;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/50.317530

Filename

317530