Title:
METHOD AND APPARATUS FOR FORMING APERIODIC GRATINGS IN OPTICAL FIBERS
Document Type and Number:
WIPO Patent Application WO1995017705
Kind Code:
A3
Abstract:
A method and apparatus for simultaneously exposing an optical fiber 32, made of a material which has a refractive index that can be permanently changed by exposure to light of a predetermined intensity at a predetermined wavelength, to two writing light beams 268,272 which intersect and interfere in a predetermined region 30 of the fiber 32 so as to create an interference pattern along a longitudinal axis of the fiber 32, for a time long enough to form a permanent refractive index variation in the waveguide. Each of said two writing beams have a predetermined number of wavelengths, each wavelength being sufficiently different from each other so as to cause said refractive index variation to be an aperiodic variation. Also, each wavelength represents a Fourier component of the desired aperiodic refractive index variation.
Inventors:
GLENN WILLIAM H
Application Number:
PCT/US1994/011059
Publication Date:
September 08, 1995
Filing Date:
September 30, 1994
Export Citation:
Assignee:
UNITED TECHNOLOGIES CORP (US)
International Classes:
G02B5/18; G02B6/02; G02B6/00; G02B6/10; G02B6/124; G02B6/34; G03H1/00; (IPC1-7): G03H1/00; G02B6/16
Foreign References:
| EP0221560A2 | 1987-05-13 | |||
| EP0569174A1 | 1993-11-10 | |||
| EP0438759A2 | 1991-07-31 | |||
| CA1149209A | 1983-07-05 |
Other References:
N.G.ABDULAEV ET.AL.: "Dynamic M-holograms in bacteriorhodopsin,recorded by phase-modulated beams", SOVIET TECHNICAL PHYSICS LETTERS, vol. 17, no. 9, September 1991 (1991-09-01), NEW YORK US, pages 643 - 645
D.C.J.REID ET AL.: "Phase-shifted moire grating fibre resonators", ELECTRONICS LETTERS., vol. 26, no. 1, 4 January 1990 (1990-01-04), ENAGE GB, pages 10 - 12
L.HASSELINK ET.AL.: "Photorefractive holographic recording in strontium barium niobate fibers", OPTICS LETTERS., vol. 13, no. 10, October 1988 (1988-10-01), NEW YORK US, pages 877 - 879
A.V.DUGIN ET.AL.: "Formation of a static hologram by different-frequency beams in Bi12SiO20 using a semiconductor laser", SOVIET JOURNAL OF QUANTUM ELECTRONICS., vol. 21, no. 10, October 1991 (1991-10-01), NEW YORK US, pages 1138 - 1140
A.SUZUKI ET.AL.: "Fabrication of chirped gratings on GaAs optical waveguides", THIN SOLID FILMS, vol. 72, 21 April 1980 (1980-04-21), LAUSANNE CH, pages 419 - 426
TORSTEN VON LINGELSHEIM ET.AL.: "A new holographic interfermeter with monomode fibers for integrated optics applications", PROCEEDINGS SPIE, vol. 600, 5 December 1985 (1985-12-05), CANNES ,FR, pages 106 - 113
A.KATZIR ET.AL.: "Chirped gratings in integrated optics", IEEE JOURNAL OF QUANTUM ELECTRONICS., vol. 13, no. 4, April 1977 (1977-04-01), NEW YORK US, pages 296 - 304
D.C.J.REID ET AL.: "Phase-shifted moire grating fibre resonators", ELECTRONICS LETTERS., vol. 26, no. 1, 4 January 1990 (1990-01-04), ENAGE GB, pages 10 - 12
L.HASSELINK ET.AL.: "Photorefractive holographic recording in strontium barium niobate fibers", OPTICS LETTERS., vol. 13, no. 10, October 1988 (1988-10-01), NEW YORK US, pages 877 - 879
A.V.DUGIN ET.AL.: "Formation of a static hologram by different-frequency beams in Bi12SiO20 using a semiconductor laser", SOVIET JOURNAL OF QUANTUM ELECTRONICS., vol. 21, no. 10, October 1991 (1991-10-01), NEW YORK US, pages 1138 - 1140
A.SUZUKI ET.AL.: "Fabrication of chirped gratings on GaAs optical waveguides", THIN SOLID FILMS, vol. 72, 21 April 1980 (1980-04-21), LAUSANNE CH, pages 419 - 426
TORSTEN VON LINGELSHEIM ET.AL.: "A new holographic interfermeter with monomode fibers for integrated optics applications", PROCEEDINGS SPIE, vol. 600, 5 December 1985 (1985-12-05), CANNES ,FR, pages 106 - 113
A.KATZIR ET.AL.: "Chirped gratings in integrated optics", IEEE JOURNAL OF QUANTUM ELECTRONICS., vol. 13, no. 4, April 1977 (1977-04-01), NEW YORK US, pages 296 - 304
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