Title :
Reduction of optical beat interference using gain-saturated RSOA in upstream WDM/SCM optical links
Author :
Won, Y.-Y. ; Kwon, H.-C. ; Han, S.-K.
Author_Institution :
Dept. of Electr. & Electron. Eng., Yonsei Univ., Seoul
fDate :
4/1/2007 12:00:00 AM
Abstract :
A new scheme for reducing optical beat interference (OBI) noise in optical network units is proposed for subcarrier multiplexing-based access network applications. The optical spectrum of the transmit lasers is broadened by using a radio frequency (RF) clipping tone with a modulation depth greater than one. This reduces the impact of the OBI noise. The distortions caused by an RF clipping tone are also suppressed by introducing a gain-saturated reflective optical amplifier, which shows the characteristics of high-pass filter. The proposed scheme has been verified by measuring the error vector magnitude of 16QAM signal with 20 Mbps. Error-free transmission has been achieved even when the light of OBI-noise-causing lasers is stronger than that of the signal laser by 7 dB
Keywords :
high-pass filters; light interference; optical distortion; optical fibre subscriber loops; optical noise; optical transmitters; reflectivity; semiconductor optical amplifiers; spectral line broadening; subcarrier multiplexing; wavelength division multiplexing; 20 Mbit/s; access network applications; error vector magnitude; error-free transmission; gain saturation; high-pass filter; modulation depth; noise reduction; noise-causing lasers; optical beat interference; optical spectrum broadening; radiofrequency clipping tone; reflective optical amplifier; reflective semiconductor optical amplifier; subcarrier multiplexing; transmit lasers; upstream optical links; wavelength division multiplexing;
Journal_Title :
Optoelectronics, IET
DOI :
10.1049/iet-opt:20060063
