Plastic and nonmetallic article shaping or treating: processes – Optical article shaping or treating – Optical fiber – waveguide – or preform
Patent
1996-11-19
1998-11-17
Vargot, Mathieu D.
Plastic and nonmetallic article shaping or treating: processes
Optical article shaping or treating
Optical fiber, waveguide, or preform
264 137, 385 10, B29D 1100
Patent
active
058371699
ABSTRACT:
A method of avoiding phase discontinuities between adjacent sections of a long Bragg grating written section-by-section in an optical fibre uses masks with alignment parts additional to their writing parts. Each alignment part is a replica of a portion of the writing part of the adjacent mask. The writing of the Bragg grating produces an associated absorption grating and so, for light directed in series through the alignment part of the mask and the already-written previous section of the grating, transmission is at a maximum when the mask is moved into exact registry. Fine adjustment of mask position is made to find this condition before writing with this mask is commenced.
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patent: 5400422 (1995-03-01), Askins et al.
Kashyap, R., et al., "Novel Method of Producing All Fibre Photoinduced Chirped Gratings," Electronics Letters, vol. 30, No. 12, Jun. 9, 1994, pp. 996-998.
Albert, J., et al., "Minimization of Phase Error in Long Fiber Bragg Grating Phase Masks Made Using Electron Beam Lithography," IEEE Photonics Technology Letters, vol. 8, No. 10, Oct. 1996, pp. 1334-1336.
Stubbe, R., et al., "Novel Technique for Writing Long Superstructured Fiber Bragg Gratings," Photosensitivity and Quadratic Nonlinearity in Glass Waveguides Fundamentals and Applications, vol. 22, Sep. 9, 1995, pp. 285-287.
Crane John D.
Northern Telecom Limited
Vargot Mathieu D.
LandOfFree
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