SELF INJECTION LOCKED PHASE LOCKED LOOPED OPTOELECTRONIC OSCILLATOR
First Claim
1. An opto-electronic oscillation circuit for sustaining an oscillating optical signal, the circuit comprising:
- a self injection locking component configured to receive a first portion of the optical signal, and further comprising a fiber optic delay line over which the optical signal propagates;
a self phase locked loop component configured to receive a second portion of the oscillating optical signal, and further comprising;
at least two fiber optic cables over which the optical signal propagates, wherein the two fiber optic cables have different lengths and at least one of the fiber optic cables is a fiber optic delay line; and
at least one phase detector coupled to the at least two fiber optic cables and configured to determine a difference in phase between a signal propagating over one of the fiber optic cables and a signal propagating over another of the fiber optic cables; and
a voltage controlled oscillator configured to generate a stable oscillating signal in response to each of an injection locking signal generated by the self injection locking component and a phase locked loop signal generated by the self phase locked loop component, the stable oscillating signal being configured to RF modulate the optical signal.
1 Assignment
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Accused Products
Abstract
Aspects of the disclosure relate generally to a circuit for sustaining an radio frequency (RF) modulated optical signal. The circuit may comprise a self injection locking component having a fiber optic delay line over which a portion of the optical signal propagates. The circuit may also comprise a self phase locked loop component having at least two fiber optic cables having different lengths and over which another portion of the optical signal propagates and a phase detector coupled to the at least two fiber optic cables and configured to determine a phase difference between the signals propagating over one of the respective fiber optic cables. The circuit may further comprise a voltage controlled oscillator configured to generate a stable oscillating signal in response to signals generated by each of the self injection locking and self phase locked loop components, the stable oscillating signal being configured to sustain the optical signal.
101 Citations
44 Claims
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1. An opto-electronic oscillation circuit for sustaining an oscillating optical signal, the circuit comprising:
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a self injection locking component configured to receive a first portion of the optical signal, and further comprising a fiber optic delay line over which the optical signal propagates; a self phase locked loop component configured to receive a second portion of the oscillating optical signal, and further comprising; at least two fiber optic cables over which the optical signal propagates, wherein the two fiber optic cables have different lengths and at least one of the fiber optic cables is a fiber optic delay line; and at least one phase detector coupled to the at least two fiber optic cables and configured to determine a difference in phase between a signal propagating over one of the fiber optic cables and a signal propagating over another of the fiber optic cables; and a voltage controlled oscillator configured to generate a stable oscillating signal in response to each of an injection locking signal generated by the self injection locking component and a phase locked loop signal generated by the self phase locked loop component, the stable oscillating signal being configured to RF modulate the optical signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 27, 28, 29, 30, 31, 32, 33)
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26. The opto-electronic oscillation circuit of claim 26, wherein the polarization-sensitive optical fiber has a length selected based on the following formula:
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34. An optoelectronic oscillator, comprising:
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a modulator providing an optical signal; a first optical filter for receiving a portion of the optical signal, the first optical filter having a output that is coupled to a first photodetector; a second optical filter for receiving a portion of the optical signal, the second optical filter having a output that is coupled to a second photodetector; a phase detector for receiving a first RF signal from the first photodetector and a second RF signal from the second photodetector with a longer delay than the first RF signal, the phase detector configured to determine a phase difference between the first and second RF signals; and a voltage controlled oscillator for receiving one of the first electrical signal from the first photodetector and the second electrical signal from the second photodetector, and for receiving a third electrical signal from the phase detector, wherein the voltage controlled oscillator is configured to output an oscillating signal in response to both the one of the first and second RF signals and the third RF signal, and wherein the oscillating signal is used to control an output of the modulator. - View Dependent Claims (35, 36, 37, 38, 39, 40, 41, 42, 43, 44)
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Specification