Fiber optic gyroscope
AssigneeEmcore Corporation
InventorsJoseph R. Demers, Ka Kha Wong, Ronald T. Logan, Jr.
Life of this patent
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Abstract
A fiber optic gyroscope including an optical circulator in the path of said first and second beams for providing polarized first and second beams of identical polarization. A phase modulator couples the first and second beams to the first and second end respectively of the fiber loop, and couples for receiving the return first and second beams from the second and first ends respectively of the fiber loop. First and second photodiodes are coupled to the optical circulator for receiving the optical signal from the first and second return beams.
Claims19
A fiber optic gyroscope comprising:
- a non-coherent light source for producing a beam of light;
- a first beam splitter in the path of said beam to produce first and second beams;
- an optical circulator in the path of said first and second beams for providing polarized third and fourth beams respectively, with polarization orthogonal to each other;
- a second beam splitter in the path of said third beam for producing fifth and sixth beams;
- first and second planar optical fiber loops each having a first end and a second end;
- a phase modulator coupling said fifth and sixth beams to said first and said second ends of said first and second optical fiber loops respectively, and receiving the return fifth and sixth beams from said second and said first ends respectively of said fiber loops;
- and
- first and second photodiodes coupled to said optical circulator for receiving the optical signal from said fifth and sixth return beams.
A fiber optic gyroscope comprising:
- a light source for producing a beam of light;
- an optical circulator in the path of said beam for providing polarized primary and secondary beams of perpendicular polarization;
- a beam splitter in the path of one of said polarized beams to produce at least first, second, and third beams;
- at least first, second, and third planar fiber loops each lying in a plane orthogonal to one another, and each having a first end and a second end;
- an optical interface coupling said first, second, and third beams to said first ends of each respective fiber loop, and for receiving the return first, second, and third beams from said second ends of each respective fiber loop;
- and
- a photodiode array coupled to said optical interface for receiving the optical signal from said first, second, and third return beams.
Dependencies are inferred from the claim text.