STABILIZED RING RESONATOR MODULATOR
First Claim
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1. An optical ring resonator modulator, comprising:
- a first waveguide having an input terminal at a first end and a throughput terminal at a second end;
a second waveguide having an output port at one end;
an optical ring to evanescently couple the first waveguide to the second waveguide;
means for changing the refractive index of the optical ring;
a light monitoring device at the throughput terminal to monitor light having an inverse intensity of light at the output port; and
a feedback circuit to control the means for changing the refractive index of the optical ring in response to an output of the light monitoring device.
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Abstract
An optical ring resonator modulator comprises a circular waveguide, or ring, evanescently coupled to a first straight waveguide and a second straight waveguide. The ring may be surrounded by an outer ring or member of doped silicon and the region inside the ring may comprise an oppositely doped member, making the ring itself the intrinsic region of a positive-intrinsic-negative (PIN) diode. When a voltage is applied between the outer and inner members the refractive index of the waveguide is changed. A photodiode at a throughput end of the first waveguide is connected to a feedback loop that controls the voltage to the members.
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Citations
20 Claims
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1. An optical ring resonator modulator, comprising:
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a first waveguide having an input terminal at a first end and a throughput terminal at a second end; a second waveguide having an output port at one end; an optical ring to evanescently couple the first waveguide to the second waveguide; means for changing the refractive index of the optical ring; a light monitoring device at the throughput terminal to monitor light having an inverse intensity of light at the output port; and a feedback circuit to control the means for changing the refractive index of the optical ring in response to an output of the light monitoring device. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for maximizing light intensity output from a ring resonator modulator, comprising:
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inputting a light signal into an input terminal of a first waveguide; evanescently coupling the light signal in the first waveguide to a ring resonator when the light signal satisfies a resonant condition of the ring resonator; passing light that does not satisfy the resonant condition through the first waveguide to a throughput terminal; monitoring the intensity of the light at the throughput terminal having an inverse intensity of light at the output port produce a control signal; and changing the resonant condition of the ring resonator with the control signal. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A system for modulating light, comprising:
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a first waveguide to carry a light signal comprising a plurality of different wavelengths; an input terminal at a first end of the first waveguide and a throughput terminal at a second end of the first waveguide; a second waveguide having an output terminal at one end; an optical ring evanescently coupled to the first waveguide and to the second waveguide; means for changing the refractive index of the optical ring; a light monitoring device at the throughput terminal to monitor light having an inverse intensity of light at the output port; and a feedback circuit to control the means for changing the refractive index of the optical ring in response to the output of the light monitoring device to modulate a resonant wavelength between the input terminal and the output terminal. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification