G - Physics – 01 – J
Patent
G - Physics
01
J
G01J 9/00 (2006.01) G01J 3/10 (2006.01) G01J 3/46 (2006.01) G01N 37/00 (2006.01) G01J 3/28 (2006.01)
Patent
CA 2210123
Arrangements are disclosed for the automatic absolute frequency calibration of a variable frequency optical source using an optical filter, such as gas cell or a calibrated interferometer, providing resonances at known frequencies in the tuning range of the source. The above calibration is performed by a control unit which has a knowledge of the known transmission pattern of the optical filter. This unit scans the frequency of the optical source via a frequency control signal over a frequency range and measures the optical intensity of the optical source output light after it has passed through the optical filter. The measured transmission and frequency control signal values are processed and stored in memory and constitute a measured absorption pattern. Once acquired for a frequency range, this pattern is compared to the theoretical transmission pattern of the optical filter. Correspondences are made to identify the transmission features against their known counterparts. A relationship between the frequency control signal and actual frequency of the optical source is established. The frequency calibration of the optical source over many frequency points is therefore achieved. The disclosed arrangement is especially suited to the frequency calibration of tunable laser sources, such as semiconductor lasers and external cavity lasers. Four specific applications of this absolute optical frequency calibrator are disclosed. The first one is the discrete ou continuous calibration of a variable frequency optical source itself. The second one is the automatic and unambiguous locking of the optical frequency source relative to a selected transmission feature of the optical filter. The third application is the optical frequency measurement of a non-tunable optical source using a beat note technique with a previously frequency-calibrated variable frequency optical source. The fourth application is the frequency control of an optical source using the frequency measuring technique proposed in the third application.
Cliche Jean-Francois
Latrasse Christine
Tetu Michel
Dicos Technologies Inc.
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
Universite Laval
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