Optical scanning spectrometer

Details Optical scanning spectrometer Optical scanning spectrometer

1999-05-18

2000-09-12

Evans, F. L.

Optics: measuring and testing

By dispersed light spectroscopy

With synchronized spectrum repetitive scanning

356328, G01J 306, G01J 310, G01J 318

Patent

active

061185302

ABSTRACT:
A reference system for an optical wavelength scanner, used for measuring wavelengths of radiation from an optical device. The system utilizes a wavelength reference comprising a fixed fiber Fabry-Perot (FFP) filter in combination with a reference fiber Bragg grating (FBG) having an accurately known reflection wavelength to minimize the effects of drift and non-linearities in the scanner and to allow a simple flexure element to be used to position a dispersive grating. The wavelengths of the reference comb of the fixed FFP are determined by reference to that of the reference FBG. Then, the peaks or notches in the light intensity from the device under test are located with respect to the comb of peaks produced by the reference. In a most simple embodiment two ports are coupled so as to provide their output light to the dispersive element simultaneously and only a single collimating lens is required for collimating light from the output ports.

REFERENCES:
patent: 4969740 (1990-11-01), Sonobe
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patent: 5438407 (1995-08-01), Harada
patent: 5489980 (1996-02-01), Anthony
patent: 5838437 (1998-11-01), Miller et al.

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