Amplified optical circuit
First Claim
Patent Images
1. A laser Doppler velocimeter comprising:
- a source of radiation;
at least a first bidirectional optical amplifier;
a transceiver;
a photodetector;
an optical waveguide circuit coupling light from the radiation source, the first bidirectional optical amplifier, the transceiver, and the photodetector, the optical waveguide circuit comprising a first optical waveguide coupling light from the radiation source to an upstream side of the first bidirectional amplifier, a second optical waveguide coupling light from a downstream side of the first bidirectional amplifier with an upstream side of the transceiver, and a third optical waveguide connecting the upstream side of the first bidirectional amplifier with the photodetector.
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Abstract
An optical circuit can include a bidirectional amplifier connected so as to amplify source light prior to emission through an output device such as a telescope as well as amplification of reflected light received by the telescope. Such an optical circuit can be used in laser doppler velocimeter applications as well as other applications. The optical circuit can also include passive splitters or active switches to provide for advantageous multiplexing.
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Citations
30 Claims
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1. A laser Doppler velocimeter comprising:
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a source of radiation; at least a first bidirectional optical amplifier; a transceiver; a photodetector; an optical waveguide circuit coupling light from the radiation source, the first bidirectional optical amplifier, the transceiver, and the photodetector, the optical waveguide circuit comprising a first optical waveguide coupling light from the radiation source to an upstream side of the first bidirectional amplifier, a second optical waveguide coupling light from a downstream side of the first bidirectional amplifier with an upstream side of the transceiver, and a third optical waveguide connecting the upstream side of the first bidirectional amplifier with the photodetector. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A laser Doppler velocimeter comprising:
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a source of radiation; at least a first bidirectional optical amplifier; a transceiver; a photodetector; an optical waveguide circuit coupling light from the radiation source, the first bidirectional optical amplifier, the transceiver, and the photodetector, the optical waveguide circuit comprising a first optical waveguide coupling light from the radiation source to an upstream side of the first bidirectional amplifier, a second optical waveguide coupling light from a downstream side of the first bidirectional amplifier with an upstream side of the transceiver, and a third optical waveguide connecting the upstream side of the first bidirectional amplifier with the photodetector; an optical circulator, the optical circulator configured to guide light from the radiation source to the first bidirectional amplifier, and to guide reflected light input into the downstream end of the first bidirectional amplifier and output from the upstream side of the first bidirectional amplifier, to the photodetector; and a second amplifier, the first optical waveguide connecting the second optical amplifier between the radiation source and the optical circulator. - View Dependent Claims (8, 9, 10)
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11. A laser Doppler velocimeter, comprising:
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a source of radiation; at least a first bidirectional optical amplifier; a transceiver; a signal processor; and an optical waveguide comprising; a first waveguide extending between the source of radiation and the transceiver and configured to guide radiation from the source of radiation, through the first bidirectional amplifier in a first direction and to the transceiver, a second optical waveguide extending between the transceiver and the signal processor and configured to guide reflected light received by the transceiver, through the first bidirectional amplifier in a second direction opposite the first direction, and to the signal processor. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. A laser Doppler velocimeter, comprising:
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a source of radiation; at least a first bidirectional optical amplifier; a transceiver; a signal processor; and an optical waveguide comprising; a first waveguide extending between the source of radiation and the transceiver and configured to guide radiation from the source of radiation, through the first bidirectional amplifier in a first direction and to the transceiver, a second optical waveguide extending between the transceiver and the signal processor and configured to guide reflected light received by the transceiver, through the first bidirectional amplifier in a second direction opposite the first direction, and to the signal processor; an optical circulator disposed in the first optical waveguide between the radiation source and the first bidirectional amplifier, the optical circulator configured to guide light from the radiation source to the first bidirectional amplifier, and to guide amplified reflected light from the first bidirectional amplifier to the signal processor; and a second amplifier, the first optical waveguide connecting the second optical amplifier between the radiation source and the optical circulator. - View Dependent Claims (20)
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21. A laser Doppler velocimeter, comprising:
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a source of radiation; a transceiver; a first variable gain optical amplifier; an optical waveguide comprising; a first waveguide extending between the source of radiation and the transceiver and configured to guide radiation from the source of radiation, through the variable gain optical amplifier in a first direction and to the transceiver, a second optical waveguide extending between the transceiver and the signal processor and configured to guide reflected light received by the transceiver, in a second direction opposite the first direction, and to the signal processor. - View Dependent Claims (22, 23, 24, 25)
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26. A laser Doppler velocimeter, comprising:
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a source of radiation; at least a first optical amplifier; a transceiver; at least a first polarization alignment device; a signal processor; and an optical waveguide comprising; a first waveguide extending between the source of radiation and the transceiver and configured to guide radiation from the source of radiation, through the first optical amplifier in a first direction and to the transceiver, a second optical waveguide extending between the transceiver and the signal processor and configured to guide reflected light received by the transceiver, in a second direction opposite the first direction, then through the first polarization alignment device and to the signal processor; wherein at least a portion of the optical waveguide comprises non-polarization maintaining optical fibers. - View Dependent Claims (27, 28, 29, 30)
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Specification