Method and system for determining the wavelength of light transm

Details Method and system for determining the wavelength of light transm Method and system for determining the wavelength of light transm

1998-04-14

2000-04-18

Kim, Robert H.

Optics: measuring and testing

For optical fiber or waveguide inspection

356345, 356352, G01B 902

Patent

active

060521791

ABSTRACT:
A method of determining the wavelength of light transmitted in an optical fiber comprises the steps of filtering the light using a filter, and then detecting the filtered light, and then determining the wavelength of the filtered light. The filter comprises a fiber grating which is recorded in a portion of the optical fiber. The fiber grating preferably has a modulated index of refraction with a modulation amplitude that varies from a first end to a second end of the fiber grating, and a modulation period defined by a grating constant that varies from the first end to the second end of the fiber grating. The fiber grating at least partially prevents transmission of light within a wavelength spectrum, and prevents transmission of a substantially larger portion of the light at a first end of the wavelength spectrum than at a second end of the wavelength spectrum. Therefore, the wavelength of the filtered light can be determined by determining a proportion of the light which was transmitted by the filter. The proportion of light which is transmitted by the filter is preferably linearly related to the wavelength of the light.

REFERENCES:
patent: 4807950 (1989-02-01), Glenn et al.
patent: 5380995 (1995-01-01), Udd et al.
patent: 5410404 (1995-04-01), Kersey et al.
patent: 5591965 (1997-01-01), Udd
patent: 5627927 (1997-05-01), Udd
patent: 5757487 (1998-05-01), Kersey

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