Title :
Accurate alignment of ultradense WDM channels using the beat-frequency-locking method
Author :
Kim, Sang-Yuep ; Huh, Suk-Woo ; Hurh, Yoon-Suk ; Seo, Kyung-Hee ; Lee, Jae-Seung
Author_Institution :
Dept. of Electron. Eng., Kwangwoon Univ., Seoul, South Korea
Abstract :
For the alignment of ultradense wavelength-division-multiplexing (UD-WDM) channels, we propose to use the beat-frequency-locking (BFL) method that can fix the channel frequencies very accurately using the beat-frequency signals between UD-WDM channels. Every UD-WDM channel is classified as an ordinary channel or as a reference channel. The ordinary channels are stabilized with respect to the reference channels through the BFL method. As a demonstration, we align 12.5-GHz-spaced nine UD-WDM channels within ±200 MHz channel spacing errors.
Keywords :
channel spacing; frequency locked loops; optical fibre networks; wavelength division multiplexing; accurate alignment; beat-frequency-locking method; channel spacing errors; nonreturn-to-zero format; ordinary-channel groups; pseudorandom bit sequence; reference channels; spectral efficiency; ultradense WDM channels; Bandwidth; Channel spacing; Frequency; Internet; Multimedia systems; Optical fiber communication; Optical switches; Semiconductor optical amplifiers; Stimulated emission; Wavelength division multiplexing;
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2003.819866
