Optical filter

Details Optical filter Optical filter

2005-02-22

2005-02-22

Healy, Brian (Department: 2883)

Optical waveguides

With optical coupler

Input/output coupler

C385S123000, C385S124000

Reexamination Certificate

active

06859585

ABSTRACT:
An optical filter comprising a slanted Bragg grating inscribed in an optical fiber portion comprising a core having a refractive index n1and a radius Rcoreand a cladding having an average refractive index n2lower than n1and a radius Rcladding, the core and the cladding of the fiber being doped with a photosensitive dopant in the fiber portion comprising the Bragg grating, which filter is characterized in that, in the fiber portion comprising the Bragg grating, the photosensitivity of the cladding is greater than the photosensitivity of the core and the cladding includes an index step area having a refractive index n3greater than n2and less than n1, said index step area having a width L defined by an inside radius Rs1greater than or equal to the radius Rcoreof the core and an outside radius Rs2less than or equal to the radius Rcladdingof the cladding.

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K. Oh et al, “Suppression of cladding mode coupling in Bragg grating using GE2O-B2O3codoped photosensitive cladding optical fibre”, Electronics Letters, IEEE Stevenage, GB, vol. 35, No. 5, Mar. 4, 1999, pp. 423,424, XP006011836.
M. J. Holmes et al, “Novel Fibre Design for Narrow-band Symmetric Response Sidetap Filters with Suppressed Leaky Mode Resonance”, 25thEuropean Conference on Optical Communication (ECOC'99). Nice, France, Sep. 27-30, 1999, vol. 1 of II, Sep. 26, 1999, pp. 1-216, 1-217, XP0001004571.
C. W. Haggans et al, “Narrow-Band Rejection Filters with Negligible Back Reflection Using Tilted Photo Inducted Gratings in Single-Mode Fibers”, IEEE Photonics Technology Letters, IEEE, Inc. < NY, US, vol. 10, No. 5, May 1, 1998, pp. 690-692, XP000754661.

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