| 摘要 |
A tunable filter system comprises a signal source providing a WDM signal having multiple channels within a spectral signal band. A reference source generates a reference signal with spectral reference features that are typically located in a spectral reference band that is outside the signal band. A tunable filter is provided comprising a cavity bounded by at least two reflectors; at least one of these reflectors is a deflecting membrane to thereby create a tunable spectral pass band. The filter has a free spectral range that is greater than a combined bandwidth of the signal band and the reference band. The tunable filter pass band filters the reference signal and the WDM signal.
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