Patent ID: 11881677
Assignee: DENSO CORPORATION
Field: Optics (Instruments)
Classification: CPC H | IPC H

Claim 0:
1. A laser light source comprising:
a resonance unit including a light emitter configured to emit light, the resonance unit being configured to resonate the light emitted by the light emitter and output the light; and
an optical negative feedback unit configured to control a frequency of the light outputted from the resonance unit by reflecting partially the light outputted from the resonance unit and inputting the reflected light to the light emitter,
wherein the resonance unit comprises:
a first waveguide connected to the light emitter;
a first reflector configured to reflect the light emitted by the light emitter and input the reflected light to the first waveguide;
a second waveguide arranged separate from the first waveguide;
a second reflector connected to an end portion of the second waveguide; and
a ring resonator arranged between the first waveguide and the second waveguide,

wherein the light emitted by the light emitter resonates between the first reflector and the second reflector by the ring resonator,
wherein the light reflected from the first reflector is blocked from the ring resonator and partially transmitted to a first end of the first waveguide opposite to a second end of the first waveguide connected to the light emitter and the first reflector,
wherein the light reflected from the second reflector is blocked from the ring resonator and partially transmitted to a first end of the second waveguide opposite to a second end of the second waveguide connected to the second reflector,
wherein the optical negative feedback unit comprises:
a third waveguide arranged such that the light blocked from the ring resonator is transmitted to the first end of the first waveguide and inputted to the third waveguide; and
a third reflector connected to the third waveguide,

wherein the light reflected from the third reflector is outputted from the third waveguide and directly inputted to the first waveguide.