Title :
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
fDate :
5/1/1996 12:00:00 AM
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;
Journal_Title :
Photonics Technology Letters, IEEE
