Photoelectric oscillator
First Claim
1. A photoelectric oscillator comprising:
- a laser beam projection unit;
an optical modulator on an optical path extending from the projection unit, which optical modulator outputs a modulated signal or an optical signal containing a harmonic of the modulated signal and includes a modulation electrode whose resonant radio-frequency band includes the frequency band of the modulation signal;
a photoelectric converter configured to convert the output of the optical modulator to an electric signal;
a temperature adjustment device of the optical modulator having a resonant electrode structure and configured to regulate the oscillation frequency of the photoelectric oscillator;
a feedback circuit configured to feed an oscillating radio-frequency electric signal obtained from the photoelectric converter back to the optical modulator; and
an output section configured to output an optical signal containing the modulation signal or a harmonic of the modulation signal or outputting the modulation signal or a harmonic of the modulation signal,a laser beam of sufficient intensity being input from the projection unit configured to produce a radio-frequency electric signal in the feedback circuit, and the radio-frequency electric signal or an optical signal containing the radio-frequency electric signal or the radio-frequency signal being output from the photoelectric oscillator.
2 Assignments
0 Petitions
Accused Products
Abstract
A photoelectric oscillator includes a laser beam projection unit; an optical modulator on an optical path extending from the projection unit, which optical modulator outputs a modulated signal or an optical signal containing a harmonic of the modulated signal and includes a modulation electrode whose resonant frequency band includes the frequency band of the modulation signal; a photoelectric converter for converting the output of the optical modulator to an electric signal; a feedback circuit for selecting from the radio-frequency electric signal obtained from the photoelectric converter an electric signal to be re-supplied to the optical modulator; and an output section for outputting an optical signal containing the modulation signal or a harmonic of the modulation signal or outputting the modulation signal or a harmonic of the modulation signal. A laser beam of sufficient intensity is input from the projection unit to produce a radio-frequency electric signal in the feedback circuit, and the radio-frequency electric signal or an optical signal containing the radio-frequency electric signal or the radio-frequency signal is output from the photoelectric oscillator.
16 Citations
13 Claims
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1. A photoelectric oscillator comprising:
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a laser beam projection unit; an optical modulator on an optical path extending from the projection unit, which optical modulator outputs a modulated signal or an optical signal containing a harmonic of the modulated signal and includes a modulation electrode whose resonant radio-frequency band includes the frequency band of the modulation signal; a photoelectric converter configured to convert the output of the optical modulator to an electric signal; a temperature adjustment device of the optical modulator having a resonant electrode structure and configured to regulate the oscillation frequency of the photoelectric oscillator; a feedback circuit configured to feed an oscillating radio-frequency electric signal obtained from the photoelectric converter back to the optical modulator; and an output section configured to output an optical signal containing the modulation signal or a harmonic of the modulation signal or outputting the modulation signal or a harmonic of the modulation signal, a laser beam of sufficient intensity being input from the projection unit configured to produce a radio-frequency electric signal in the feedback circuit, and the radio-frequency electric signal or an optical signal containing the radio-frequency electric signal or the radio-frequency signal being output from the photoelectric oscillator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A photoelectric oscillator comprising:
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a laser beam projection unit; an optical modulator on an optical path extending from the projection unit, which optical modulator outputs a modulated signal or an optical signal containing a harmonic of the modulated signal and includes a modulation electrode whose resonant radio-frequency band includes the frequency band of the modulation signal; a photoelectric converter configured to convert the output of the optical modulator to an electric signal; a feedback circuit configured to feed an oscillating radio-frequency electric signal obtained from the photoelectric converter back to the optical modulator; and an output section configured to output an optical signal containing the modulation signal or a harmonic of the modulation signal or outputting the modulation signal or a harmonic of the modulation signal, a laser beam of sufficient intensity being input from the projection unit to produce a radio-frequency electric signal in the feedback circuit, and the radio-frequency electric signal or an optical signal containing the radio-frequency electric signal or the radio-frequency signal being output from the photoelectric oscillator, wherein the optical modulator is a Mach-Zehnder interference modulator on two constituent optical paths of which are provided multiple phase modulators having resonant electrode structures of differing resonant frequency, each of the phase modulators being applied with a signal obtained by regulating the amplitude or phase of the optical modulator output and further provided with means for varying said amplitude or phase to control the transmission frequency characteristic of the Mach-Zehnder interference modulator with respect to the radio-frequency electric signal.
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13. A photoelectric oscillator comprising:
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a laser beam projection unit; an optical modulator on an optical path extending from the projection unit, which optical modulator outputs a modulated signal or an optical signal containing a harmonic of the modulated signal and includes a modulation electrode whose resonant radio-frequency band includes the frequency band of the modulation signal; a photoelectric converter configured to convert the output of the optical modulator to an electric signal; a feedback circuit configured to feed an oscillating radio-frequency electric signal obtained from the photoelectric converter back to the optical modulator; and an output section configured to output an optical signal containing the modulation signal or a harmonic of the modulation signal or outputting the modulation signal or a harmonic of the modulation signal, a laser beam of sufficient intensity being input from the projection unit to produce a radio-frequency electric signal in the feedback circuit, and the radio-frequency electric signal or an optical signal containing the radio-frequency electric signal or the radio-frequency signal being output from the photoelectric oscillator, wherein the optical modulator is a Mach-Zehnder interference modulator on two constituent optical paths of which are provided multiple phase modulators having resonant electrode structures of differing resonant frequency, each of the phase modulators being applied with a signal obtained by regulating the amplitude or phase of the optical modulator output and further provided with means for varying said amplitude or phase to control the transmission frequency characteristic of the Mach-Zehnder interference modulator with respect to the radio-frequency electric signal, wherein the phase modulators provided on the first optical path of the two constituent optical paths of the Mach-Zehnder interference modulator and the phase modulators provided on the second optical path thereof have a common resonance band and a radio-frequency signal belonging to the common resonance band is applied to the phase modulators of the two paths at a predetermined phase, the radio-frequency signal being the output signal of the photoelectric converter.
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Specification