At+t Corp.

William E Watters

Arthur E Neeves

James Edgar Williams

This invention provides an apparatus and a method of filtering a MM Wavelength Division Multiplexed (WDM) signal operating in the 1548 to 1560 nm region. The wavelengths of the MM are spaced 1-12 nm apart and centered about 1558 nm. The adjustable filters for tuning MM optical signals encompass a carousel and a mechanical system for positioning one of the filters in the path of the MM WDM signal and tracking the signal. An algorithm controls the mechanical system for tracking and positioning one of the filters in the path of the MM WDM signal. The filter in position filters one of a plurality of wavelengths and tunes the filter to compensate for temperature changes.

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Hackettstown, NJ, United States of America

William E Watters