06236782 is referenced by 21 patents and cites 46 patents.

An add/drop filter for optical wave energy incorporates a Bragg grating in a very narrow waist region defined by merged lengths of elongated optical fibers. Light is propagated into the waist region via adiabatically tapered fibers and is transformed from two longitudinally adjacent fibers into two orthogonal modes within the air-glass waveguide of the waist and reflected off the grating from one fiber into the other. The geometry of the waist region is such that the reflected drop wavelength is polarization independent, without lossy peaks in the wavelength band of interest. Additionally, back reflection are shifted out of the wavelength band of interest. High strength gratings are written by photosensitizing the waist region fibers by constantly in-diffusing pressurized hydrogen or deuterium. For narrow spectral bandwidth gratings, dimensional variations must be minimized or compensated, and the grating is apodized by both a.c. and d.c. variations in writing beams at a net constant power. A coupler device employing these precisely is arranged in a support structure which facilitates writing, testing and adjustment of gratings, and also provides temperature compensation and wavelength adjustment.

Title
Grating assisted coupler devices
Application Number
9/128477
Publication Number
6236782 (B1)
Application Date
August 4, 1998
Publication Date
May 22, 2001
Inventor
Xiaolin Tong
Pasadena
CA, US
Phil A Willems
Pasadena
CA, US
George A Rakuljic
Santa Monica
CA, US
Anthony S Kewitsch
Hacienda Heights
CA, US
Agent
Jones Tullar & Cooper P C
US
Assignee
Arroyo Optics
CA, US
IPC
G02B 6/26
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