Optics: measuring and testing – By light interference – Using fiber or waveguide interferometer
Reexamination Certificate
2006-04-18
2006-04-18
Turner, Samuel A. (Department: 2877)
Optics: measuring and testing
By light interference
Using fiber or waveguide interferometer
C356S491000
Reexamination Certificate
active
07030992
ABSTRACT:
A fiber-optic interferometer is provided. The interferometer includes a first dual-mode optical fiber for receiving a light input and exciting a first and a second spatial, modes, a first modal processor connected to the first dual-mode optical fiber for selecting the first and the second spatial modes, a second dual-mode optical fiber connected to the first modal processor for propagating the first and the second spatial modes and producing a phase shift (Δφ) between the first and the second spatial modes in response to an external perturbation effect, a second modal processor connected to the second dual-mode optical fiber for re-selecting the first and the second spatial modes and producing a first light output interference pattern, and an analyzer connected to the second modal filter for adjusting the first light output interference pattern to produce a second light output interference pattern.
REFERENCES:
patent: 5586205 (1996-12-01), Chen et al.
B.Y. Kim, J.N. Blake, S.Y.Huang, and H. J. Shaw, “Use of Highly Elliptical Core for Two-Mode Fiber Devices”, Sep. 1987, Optics Letters, vol. 12, No. 9, pp. 729-731.
K. Bohnert, G. de Wit, and J. Nehring, “Interrogation of a Remote Elliptical -Core Dual-Mode Fiber Strain Sensor by Using a Tandem Interferometer Configuration”, May 1992, Optics Letters, vol. 17, No. 9, p. 694.
W.V. Sorin, B.Y. Kim, and H.J. Shaw, “Highly Selective Evanescent Modal Filter for Two-Mode Optical Fibers”, Sep. 1986, Optics Letters, vol. 11, No. 9, p. 581.
Tien-Jung Chen, “Use of liquid-crystal-clad fiber as a modal filter for a two-mode fiber-optic interferometer”, Dec. 2004, Optics Letters, vol. 29, No. 24, p. 2852.
Chen Shu-Hsia
Chen Tien-Jung
Connolly Patrick
The Webb Law Firm
Turner Samuel A.
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