Optical waveguides – With optical coupler – Input/output coupler
Reexamination Certificate
2003-05-19
2008-10-21
Connelly-Cushwa, M. R. (Department: 2874)
Optical waveguides
With optical coupler
Input/output coupler
C385S132000, C065S386000
Reexamination Certificate
active
07440653
ABSTRACT:
A method of simultaneously defining a waveguide and grating in a sample of photosensitive material comprises providing a sample of material (24) having a region which is photosensitive to light of a specific wavelength, generating a spot of light (22) at the specific wavelength, the spot having a periodic intensity pattern of high and low intensity fringes, and a width which is related to the width of the channel, positioning the spot within the photosensitive region and causing relative movement between the sample and the light spot along the desired path of the waveguide/grating define a channel of altered refractive index by exposing parts of the photosensitive region to the light spot. Modulation of the light spot to produce multiple exposures produces a grating, while continuous exposure results in a uniform waveguide. These structures can be written in straight lines or around curves, and can be accurately overwritten, so that complex optical devices can be produced in a single fabrication step.
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Albanis Vassilios
Emmerson Gregory Daniel
Gawith Corin Barry Edmund
Smith Peter George Robin
Watts Samuel Paul
Connelly-Cushwa M. R.
Rahll Jerry T
Renner, Otto, Boisselle & Sklar, LLP.
University of Southampton
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