Semiconductor laser gyro with modulated driving power source
AssigneeCanon Kabushiki Kaisha
InventorTakahiro Numai
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Abstract
An optical gyro reduces the coupling loss generated when emitted laser beams are incident upon a photo detector and the noise generated by the laser beams reentering the laser from an external point of reflection. The gyro includes a ring resonator type semiconductor laser for having laser beams transmitted circularly in opposite directions relative to each other and a terminal for detecting a beat signal, with the active layer of the semiconductor laser being ring-shaped.
Claims26
A gyro, comprising:
- a ring resonator type semiconductor laser having laser beams transmitted circularly in opposite directions relative to each other, said laser including a terminal for detecting a beat signal and a ring-shaped active layer;
- and
- a driving power source for driving said semiconductor laser, said driving power source being modulated with a frequency in a frequency band different from that of the beat signal.
A gyro, comprising:
- a ring resonator type semiconductor laser having laser beams transmitted circularly in opposite directions relative to each other, said laser including a ring-shaped active layer;
- means for detecting a beat signal generated by rotation of said ring resonator type semiconductor laser;
- and
- a driving power source for driving said semiconductor laser, said driving power source being modulated with a frequency in a frequency band different from that of the beat signal.
A gyro, comprising:
- a ring resonator type semiconductor laser having laser beams transmitted circularly in opposite directions relative to each other, said ring resonator type semiconductor laser having a central region at least partly showing a high resistivity and a terminal for detecting a beat signal;
- and
- a driving power source for driving said semiconductor laser, said driving power source being modulated with a frequency in a frequency band different from that of the beat signal.
A gyro according to clam 13, wherein the high resistivity is produced by implanting ions into said semiconductor laser.
A gyro, comprising:
- a ring resonator type semiconductor laser having laser beams transmitted circularly in opposite directions relative to each other, said ring resonator type semiconductor laser having a central region at least partly showing a high resistivity;
- means for detecting a beat signal generated by rotation of said ring resonator type semiconductor laser;
- and
- a driving power source for driving said semiconductor laser, said driving power source being modulated with a frequency in a frequency band different from that of the beat signal.
A semiconductor device, comprising:
- a ring resonator type semiconductor laser having laser beams transmitted circularly in opposite directions relative to each other, said laser including a ring-shaped active layer, and a terminal for detecting a beat signal;
- and
- a driving power source for driving said semiconductor laser, said driving power source being modulated with a frequency in a frequency band different from that of the beat signal.
Dependencies are inferred from the claim text.