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We present a beat-frequency-locking method that uses a tunable laser source (TLS) for the alignment of ultradense (UD) wavelength-division-multiplexing (WDM) channels. The beat-frequency signals between UD-WDM channels and the TLS are used to align the UD-WDM channels within microwave accuracies. As a demonstration, we align 64 UD-WDM channels in 12.5-GHz channel spacing with less than /spl plusmn/100-MHz errors.
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Kim et al. (2004) studied this question.
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