Optical waveguide device

Details Optical waveguide device Optical waveguide device

2006-12-05

2006-12-05

Palmer, Phan (Department: 2874)

Optical waveguides

With optical coupler

Input/output coupler

C385S010000

Reexamination Certificate

active

07146078

ABSTRACT:
An FBG encoder as an optical waveguide device includes plural unit FBGs respectively including a periodic refractive index modulation structure in a longitudinal direction of an optical fiber and aligned in the longitudinal direction of the optical fiber; and a phase shift section formed between any two adjacent unit FBGs among the plural unit FBGs, thereby producing a predetermined phase difference between the periodic refractive index modulation structures of two adjacent unit FBGs, wherein the unit FBGs respectively have a structure wherein a period of the periodic refractive index modulation of the plural unit diffraction grating sections gradually increases or decreases in the longitudinal direction of the optical fiber or a structure wherein amplitude of the periodic refractive index modulation is varied relative to the longitudinal direction of the optical fiber so that an envelope of the periodic refractive index modulation is a predetermined window function.

REFERENCES:
patent: 6519390 (2003-02-01), Fells et al.
patent: 6614950 (2003-09-01), Huang et al.
patent: 2005-043771 (2005-02-01), None
Toru Mizunami, “Optical fiber diffraction gratings”, Oyo Buturi (Applied Physics), vol. 67, No. 9, 1998, pp. 1029-1033.
Akihiko Nishiki et al, “Development of OCDM Phase Encoder Using SSFBG”, Technical Report of IEICE, OFT 2002-66, Nov. 2002, pp. 13-18.
Hideyuki Sotobayashi, “Optical Encoding Division Multiplexing Networks”, Oyo Buturi (Applied Physics) , vol. 71, No. 7, 2002, pp. 853-859.

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