Reduction of optical-beat interference in subcarrier networks

Author

Woodward, S.L. ; Lu, X. ; Darcie, T.E. ; Bodeep, G.E.

Author_Institution

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

Volume

8

Issue

5

fYear

1996

fDate

5/1/1996 12:00:00 AM

Firstpage

694

Lastpage

696

Abstract

We present a method for improving the performance of a subcarrier multiplexed passive optical network (SCM-PON) in the presence of optical beat interference (OBI). By introducing strong "clipping tones" (optical-modulation depth >1) on each of the lasers their optical spectrum can be broadened, thereby ameliorating the effects of OBI. By carefully selecting the RF band used to carry signals, and that used for "clipping tones", OBI can be reduced without the clipping inducing errors. We have demonstrated the effectiveness of this technique by measuring the BER of a QPSK channel in the presence of OBI. A delayed self-homodyne technique was used to simulate worst-case conditions.

Keywords

interference suppression; light interference; optical fibre subscriber loops; optical fibres; quadrature phase shift keying; subcarrier multiplexing; BER; QPSK channel; RF band; SCM-PON; clipping tones; delayed self-homodyne technique; lasers; optical beat interference; optical modulation; optical spectrum; subcarrier multiplexed passive optical network; Intelligent networks; Interference; Laser noise; Optical distortion; Optical fiber networks; Optical network units; Optical noise; Optical receivers; Passive optical networks; Radio frequency;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/68.491598

Filename

491598