Diffraction grating device

Details Diffraction grating device Diffraction grating device

2005-04-05

2005-04-05

Tremblay, Mark (Department: 2876)

Optical waveguides

With optical coupler

Input/output coupler

Reexamination Certificate

active

06876791

ABSTRACT:
In a diffraction grating device (1), index modulations are formed along the longitudinal direction of an optical fiber (10) serving as an optical waveguide. The optical fiber (10) has a core region (11), an inner cladding region (12), and an outer cladding region (13) sequentially from the optical axis center. Index modulations are formed in both the core region (11) and the inner cladding region (12) of the optical fiber (10) in each of a plurality of regions A1to AN(N is an integer; N≧2) separated from each other along the longitudinal direction of the optical fiber (10). In the diffraction grating device (1), regions An(n=1 to N) in which index modulations are formed in both the core region (11) and the inner cladding region (12) and regions Bn(n=1 to N−1) in which no index modulations are formed alternately exist along the longitudinal direction.

REFERENCES:
patent: 6314221 (2001-11-01), Riant et al.
patent: 6490078 (2002-12-01), Enomoto et al.
patent: 20030016912 (2003-01-01), Riant et al.
“Field Distributions Inside Fiber Gratings”, Miguel A. Muriel, IEEE Journal of Quantum Electronics, vol. 35, No. 4, Apr. 1999, 548-558.
“Novel designs for sampled grating-based multiplexers-demultiplexers”, W. H. Loh et al., Optic Letters, Nov. 1, 1999, vol. 24, No. 21, pp. 1457-1459.
“Dispersion Compensating Multi-Channel FBG with Low Radiation Mode Losses”, Kiyotaka Murashima et al., OECC / IOOC 2001 Conference Incorporating ACOFT.

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