Title :
A method for reducing multipath interference noise
Author :
Woodward, S.L. ; Darcie, T.E.
Author_Institution :
Crawford Hill Lab., AT&T Bell Labs., Holmdel, NJ, USA
fDate :
3/1/1994 12:00:00 AM
Abstract :
One source of noise in optical communication systems is multipath interference (MPI)-intensity noise caused by multiple discrete reflections or double Rayleigh backscatter (DRB). MPI converts phase noise to intensity noise, which can cause significant impairments in analog lightwave systems transmitting CATV signals. We have found that by dithering the laser frequency by several gigahertz at kilohertz frequencies this noise can be reduced. We have demonstrated this technique using a DFB laser.<>
Keywords :
Rayleigh scattering; backscatter; cable television; distributed feedback lasers; interference suppression; light reflection; optical links; television interference; 1.3 micron; 1.5 micron; CATV signal; DFB laser; analog lightwave systems; dithering; double Rayleigh backscatter; intensity noise; laser frequency; multipath interference noise reduction; multiple discrete reflections; noise source; optical communication systems; phase noise; Acoustic reflection; Backscatter; Frequency; Interference; Laser noise; Noise reduction; Optical fiber communication; Optical noise; Optical reflection; Phase noise;
Journal_Title :
Photonics Technology Letters, IEEE
