Optical waveguides – With optical coupler – Input/output coupler
Patent
1997-07-01
1999-09-14
Lee, John D.
Optical waveguides
With optical coupler
Input/output coupler
430290, G02B 634
Patent
active
059534710
ABSTRACT:
Embodiments of the invention include a method for fabricating Bragg reflector gratings using an amplitude mask and an amplitude mask apparatus for fabricating Bragg reflectors. The inventive Bragg reflector gratings have periodicities greater than conventional short period gratings but much less than conventional long period gratings. Short period, Bragg reflector gratings according to embodiments of the invention have periodicities, e.g., within the range from 1 .mu.m to 10 .mu.m. The fabrication method includes positioning an amplitude mask having appropriate slits formed therein over the photosensitive waveguide of interest and then illuminating the waveguide through the slits thereby photoinducing a periodic pattern of refractive index perturbations characteristic of a Bragg reflector. The short period, Bragg grating produced by the inventive amplitude mask is a reflective grating whose reflection characteristics approach approximately 99.99%. Reflective gratings fabricated in accordance with embodiments of the invention are useful in adding and dropping channels in wavelength division multiplexed systems and in applications such as laser stabilization and structural integrity sensing.
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"Using microcontact printing to generate amplitude photomasks on the surfaces of optical fibers: A method for producing in-fibr gratings" by John A. Rogers, Rebecca J. Jackman and George M. Whitesides, Harvard University, and Jefferson L. Wagener and Asish M. Vengsarkar, Lucent Technologies Inc., in Appl. Phys. Lett. 70,, Jan. 6, 1997, pp. 7-9.
Espindola Rolando Patricio
Vengsarkar Ashish Madhukar
Wagener Jefferson Lynn
Harman John M.
Kang Juliana K.
Lee John D.
Lucent Technologies - Inc.
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