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US 6,445,454 B1Granted
Gyro having modulated frequency driven laser
AssigneeCanon Kabushiki Kaisha
InventorTakahiro Numai
Life of this patent
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Abstract
A gyro and an operating method is capable of reducing coupling losses which arise when laser beams enter a photodetector and noise which develops due to light entering into a laser from external reflection points. The gyro includes a ring resonator type laser in which laser beams circularly counter propagate, and detects a change in a current or an impedance based on a beat which is generated by the interference of the laser beams counter propagating each other within the laser.
Claims10
A gyro, comprising:
- a ring resonator type laser in which laser beams circularly counter-propagate each other;
- a driving source driving said laser with a constant-voltage source, wherein said driving source has been modulated with a frequency which lies outside a frequency band of a beat signal;
- and
- beat signal detecting means for detecting the beat signal as a change in a current that flows through said ring resonator type laser.
1 more element
A gyro, comprising:
- a ring resonator type semiconductor laser in which laser beams circularly counter-propagate each other;
- a driving source driving said ring resonator type semiconductor laser, wherein said driving source has been modulated with a frequency which lies outside a frequency band of a beat signal;
- and
- beat signal detecting means for detecting the beat signal as a change in impedance of said semiconductor laser.
1 more element
Dependencies are inferred from the claim text.