Abstract
A temperature compensation technique is proposed and demonstrated for highly
accurate control of the transmission wavelength of wavelength-tunable optical
bandpass filters. The technique calculates wavelength error, which is caused by
transient variations of the operating temperature of filter modules, by use of the
theory of thermal conduction and controls the filter with an appropriate offset
according to the calculated value to maintain a constant transmission wavelength. A
disk-shaped wavelength-tunable filter based on a mechanical tuning mechanism is
demonstrated to confirm the validity of the technique. For the filter, the
transmission wavelength is controlled to an accuracy of 0.01 nm against drastic
temperature variations whose maximal change rate reaches 2.5 °C∕min in the range of
20-50 °C. A filter controlled with this technique has the potential to provide
high-performance channel selectors for wavelength-division-multiplex-based photonic
networks, and its feasibility is confirmed by transmission experiments at 2.5
Gbit/s.
© 2004 Optical Society of America
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