Coarse spectrometer with a grating

Details Coarse spectrometer with a grating Coarse spectrometer with a grating

2006-01-31

2006-01-31

Harvey, Minsun Oh (Department: 2828)

Coherent light generators

Particular resonant cavity

Distributed feedback

C372S020000, C372S092000, C372S099000

Reexamination Certificate

active

06993057

ABSTRACT:
A quasi-monochromatic light beam carrier for a particular telecommunication channel is likely to experience drift because of age, temperature, or other factors, and may cause the centroid wavelength of the carrier to shift. Temperature adjustments by wavelength lockers to compensate for drift on one channel may affect the performance of other channels. Embodiments of the present invention couple a quasi-monochromatic light beam through a substrate-based grating, diffract the light beam from the edge of the substrate to free space, and detect the light beam from free space at a position detector to determine the centroid wavelength based on a position of the light beam incident on the detector. The diffracted light beam may be reflected within the substrate a number of times prior to exiting the substrate towards the detector.

REFERENCES:
patent: 6275317 (2001-08-01), Doerr et al.
patent: 6795459 (2004-09-01), Tsai

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