Bragg grating variable optical attenuator

Details Bragg grating variable optical attenuator Bragg grating variable optical attenuator

1996-06-28

1997-12-16

Ullah, Akm E.

Optical waveguides

Accessories

Attenuator

385 37, G02B 610, G02B 600

Patent

active

056994680

ABSTRACT:
An attenuator capable of controllably attenuating at least two wavelengths of light is configured to have an optical waveguide section having at least two Bragg gratings disposed therein in series. The Bragg gratings have a sloped reflectivity response within a predetermined wavelength range. The sloped response is a function of refractive index variations within each of the grating elements. By compressing or expanding at least one of the gratings, the periodicity is modified so as to shift its central wavelength within a predetermined wavelength range.

REFERENCES:
patent: 4807950 (1989-02-01), Glenn et al.
patent: 5007705 (1991-04-01), Morey et al.
patent: 5446809 (1995-08-01), Fritz et al.
Variable-spectral-response optical waveguide Bragg grating filters for optical signal processing Hill; Malo, Bilodeau; Theriault; Johnson; Albert Optic Letters, vol. 20, No. 12, Jun. 15, 1995.

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