Accurate alignment of ultradense WDM channels using the beat-frequency-locking method

• Published in: Journal of lightwave technology Vol. 21; no. 11; pp. 2891 - 2894
• Main Authors: KIM, Sang-Yuep, HUH, Suk-Woo, HURH, Yoon-Suk, SEO, Kyung-Hee, LEE, Jae-Seung
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.11.2003; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Alignment; Applied sciences; Bandwidth; Channel spacing; Channels; Errors; Exact sciences and technology; Frequency; Information, signal and communications theory; Internet; Multimedia systems; Multiplexing; Optical fiber communication; Optical switches; Semiconductor optical amplifiers; Signal and communications theory; Stimulated emission; Systems, networks and services of telecommunications; Telecommunications; Telecommunications and information theory; Transmission and modulation (techniques and equipments); Wavelength division multiplexing; Alignment; wavelength-division multiplexing (WDM); Beat frequency; Frequency locking; Optical telecommunication; Transmission channel; Wavelength division multiplexing; optical communications; Dense wavelength-division multiplexing (DWDM); ultradense wavelength-division multiplexing (UD-WDM)
• ISSN: 0733-8724; 1558-2213
• DOI: 10.1109/JLT.2003.819866

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 /spl plusmn/200 MHz channel spacing errors.