Optical waveguides – With optical coupler – Particular coupling function
Reexamination Certificate
2006-01-24
2006-01-24
Ullah, Akm Enayet (Department: 2874)
Optical waveguides
With optical coupler
Particular coupling function
C356S483000
Reexamination Certificate
active
06990269
ABSTRACT:
In a fiber optic gyroscope comprising a light source, a fiber optic coupler, an optical integrated circuit having a function of a polarizer and a branching optical waveguide, and a fiber optic coil, and detecting an angular velocity applied to the fiber optic coil about the axis thereof, a polarization maintaining optical fiber having its length L is connected to an input/output end of the optical integrated circuit nearer the light source in an optical system of optical fiber from the light source to the optical integrated circuit, the polarization maintaining optical fiber of its length L resulting in a difference in group delay time between the orthogonal two polarization modes and the difference at least exceeding a coherence length of light from the light source. An optical system of optical fiber from the light source to the optical integrated circuit except for the polarization maintaining optical fiber of its length L is formed by a single mode optical fiber, and the fiber optic coupler is formed by a single mode optical fiber.
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Ohno Aritaka
Usui Ryuji
Gallagher & Lathrop
Japan Aviation Electronics Industry Limited
Lathrop, Esq. David N.
Ullah Akm Enayet
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