| 摘要 |
The present invention provides a wavelength selective optical filter device (240) for receiving input radiation and outputting corresponding filtered output radiation. The filter device (240) includes a plurality of at least partially mutually coupled Fabry-Perot optical resonators (330,340,360;360,400,430) for filtering the input radiation to generate the output radiation, the resonators having tuning ranges which at least partially mutually overlap, the filter device (240) being tunable from a first radiation wavelength to a second radiation wavelength by mutually detuning the resonators in a period where the resonators are being retuned from the first wavelength ( lambda 1) to the second wavelength ( lambda 2) so that the filter device (240) is substantially in a non-responsive state during the period. The resonators incorporate freely suspended mirrors (360, 430) which are electrostatically actuated to affect tuning of the resonators (330,340,360;360,400,430). The filter device (240) is thereby capable of tuning between different wavelengths without tuning through wavelengths therebetween. The filter device (240) can be included into an add-drop filter (10) in a multichannel WDM communication system (100). <IMAGE> |
