Crosstalk and prefiltering in a two-channel ASK heterodyne detection system without the effect of laser phase noise

Author

Park, Y.K. ; Bergstein, S.S. ; Tench, R.E. ; Smith, R.W. ; Korotky, S.K. ; Burns, K.J. ; Granlund, S.W.

Author_Institution

AT&T Bell Labs., Allentown, PA, USA

Volume

6

Issue

8

fYear

1988

fDate

8/1/1988 12:00:00 AM

Firstpage

1312

Lastpage

1320

Abstract

The authors present an experimental and theoretical study on the crosstalk in a two-channel amplitude-shift keying (ASK) heterodyne detection system in which the effect of laser phase noise is negligible. Three results are described: (1) the dependence of the crosstalk penalty on the ratio of channel separation to bit rate and on the optical power level of the image band (2) comparison of the measured crosstalk penalities with the ones obtained from a simple model, and (3) the effect of electrical prefiltering on the crosstalk penalty. It is concluded that the channel separation can be as low as four times the bit rate without incurring any crosstalk penalty as long as the optical power of the image band is comparable to the optical power of the desired channel. In addition, electrical prefiltering of the transmitted signals significantly reduces the crosstalk penalty in multichannel ASK heterodyne systems in which the effect of laser phase noise is negligible

Keywords

crosstalk; optical communication equipment; optical information processing; optical links; optical modulation; signal detection; telecommunication channels; amplitude-shift keying; bit rate; channel separation; crosstalk; electrical prefiltering; image band; laser phase noise; optical power level; prefiltering; two-channel ASK heterodyne detection system; Amplitude shift keying; Bit rate; Laser modes; Laser noise; Laser theory; Optical crosstalk; Optical mixing; Optical noise; Phase detection; Phase noise;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/50.4136

Filename

4136