Optical waveguides – With optical coupler – Input/output coupler
Patent
1998-07-06
2000-03-07
Sanghavi, Hemang
Optical waveguides
With optical coupler
Input/output coupler
385123, 359569, G02B 634
Patent
active
060350830
ABSTRACT:
A method and an apparatus for writing arbitrary refractive index perturbations along an optical waveguide. The method includes the steps of providing a waveguide having a photosensitive region and providing a writing beam of actinic radiation having a nominal diameter D, the writing beam defining an optical axis. A waveguide is translated relative to the optical axis of the writing beam at a known velocity v(t). A modulator modulates the radiation intensity I(t) of the writing beam as a function of time t to deliver a fluence of radiation, .PHI.(x), directly to the waveguide, wherein ##EQU1## The refractive index change .DELTA.n.sub.(x) at a position x along the waveguide length is related to the fluence delivered to that position as, .DELTA.n.sub.(x) =C.multidot..PHI..sub.(x), wherein C is a scaling factor that accounts for the photosensitivity of the waveguide.
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Brennan, III James F.
LaBrake Dwayne L.
3M Innovative Company
Ho Nestor F.
Sanghavi Hemang
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