Title :
Rayleigh Noise Reduction in 10-Gb/s DWDM-PONs by Wavelength Detuning and Phase-Modulation-Induced Spectral Broadening
Author :
Chow, C.W. ; Talli, G. ; Townsend, P.D.
Author_Institution :
Dept. of Phys., Univ. Coll. Cork
fDate :
3/15/2007 12:00:00 AM
Abstract :
A novel scheme for reducing Rayleigh beat noise in centralized light source dense wavelength-division-multiplexed passive optical networks is demonstrated using an optimized channel-detuned optical filtering of 30 GHz and phase-modulation-induced spectral broadening of a 10-Gb/s upstream nonreturn-to-zero (PM-NRZ) signal. The required optical-signal-to-Rayleigh-noise-ratio (OSRNR), characterized experimentally, can be reduced by up to 16 dB while retaining negligible transmission penalty over 20-km single-mode fiber without dispersion compensation. Numerical analysis is performed to study the tradeoff between OSRNR improvement and attenuation of the PM-NRZ signal as a function of different channel detuning and center wavelength suppressions
Keywords :
light sources; optical fibre dispersion; optical fibre networks; optical filters; optical modulation; optical noise; phase modulation; spectral line broadening; telecommunication channels; wavelength division multiplexing; 10 Gbit/s; 20 km; 30 GHz; Rayleigh beat noise; Rayleigh noise reduction; central wavelength suppression; centralized light source; channel detuned optical filtering; channel detuning; dense wavelength-division multiplexing; optical-signal-to-Rayleigh-noise-ratio; passive optical networks; phase modulation; single-mode fiber; spectral broadening; transmission penalty; upstream nonreturn-to-zero signal; wavelength detuning; Light sources; Noise reduction; Optical attenuators; Optical fiber filters; Optical fiber networks; Optical filters; Optical noise; Passive filters; Passive optical networks; Phase noise; Passive optical network (PON); Rayleigh backscattering (RB); phase modulation;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2007.892899
