Optical waveguides – With optical coupler – Input/output coupler
Patent
1995-11-16
1998-05-05
Ullah, Akm E.
Optical waveguides
With optical coupler
Input/output coupler
359569, 359573, G02B 634, G02B 518
Patent
active
057488142
ABSTRACT:
A method for spatially controlling the period and amplitude of Bragg filters in an optical medium having a longitudinal axis that is sensitive to at least some wavelength of electromagnetic radiation. A phase mask of period .LAMBDA. is laid close to the optical medium at an angle .alpha. with respect to the longitudinal axis of the optical medium. A single beam of electromagnetic radiation is directed at an incidence angle .phi. with respect to normal incidence on the phase mask so that the radiation is diffracted, resulting in an interference pattern having a period P impinged into the optical medium so that the period P of the interference pattern may be altered by changing the incidence angle .phi. or the angle .alpha. . This method is simpler, more flexible and more suitable for mass production than existing methods.
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Chandonnet Alain
Galarneau Pierre
Langlois Pierre
Lauzon Jocelyn
Painchaud Yves
Institut National D'Optique
Sanghavi Hemang
Ullah Akm E.
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