A method for reducing the channel spacing in a coherent optical heterodyne system

Author

O´Byrne, Vincent

Author_Institution

GTE Lab. Inc., Boston, MA, USA

Volume

2

Issue

7

fYear

1990

fDate

7/1/1990 12:00:00 AM

Firstpage

513

Lastpage

515

Abstract

A method of channel allocation for the reduction of the channel spacings in a heterodyne optical transmission system is proposed and analyzed for the specific case of frequency shift keying (FSK). This technique makes it possible to reduce the average optical interchannel spacing by an amount approximately equal to the intermediate frequency. This can increase the number of channels that can be accommodated within the generally limited continuous tuning range of commercial lasers employed as local oscillators by as much as 100% without the need for auxiliary equipment.<>

Keywords

demodulation; frequency shift keying; laser tuning; optical modulation; FSK; channel allocation; channel spacing; channel spacing reduction; coherent optical heterodyne system; commercial lasers; frequency shift keying; intermediate frequency; laser tuning; limited continuous tuning range; local oscillators; optical interchannel spacing; Automatic frequency control; Channel spacing; Frequency shift keying; Laser tuning; Local oscillators; Optical filters; Optical mixing; Optical receivers; Optical transmitters; Optical tuning;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/68.56642

Filename

56642