| US 7,589,840 B2 | ||
| Broad- and inter-band multi-wavelength-reference method and apparatus for wavelength measurement or monitoring systems | ||
| Ke-Cai Zeng, Fremont, Calif. (US) | ||
| Assigned to Sunrise Telecom Incorporated, San Jose, Calif. (US) | ||
| Filed on Jan. 10, 2006, as Appl. No. 11/329,522. | ||
| Prior Publication US 2007/0183781 A1, Aug. 09, 2007 | ||
| Int. Cl. G01B 9/02 (2006.01) | ||
| U.S. Cl. 356—454 | 16 Claims |
| 1. A wavelength measurement or monitoring system, comprising:
providing a tunable Fabry-Perot optical filter;
using at least one known light source to calibrate and correlate separate wavelength bands scanned by the tunable Fabry-Perot
optical filter;
utilizing at least one wavelength reference to calibrate at least one wavelength band of the tunable Fabry-Perot optical filter
including simultaneously coupling the outputs of first and second lasers to a wavelength meter and to the tunable Fabry-Perot
optical filter;
transferring the wavelength reference to a wavelength band that is identified for measurement when the wavelength reference
is not in a wavelength band identified for measurement by the tunable Fabry-Perot optical filter;
scanning an unknown optical signal through the tunable Fabry-Perot optical filter; and
specifying a wavelength in the unknown optical signal.
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