Photonics stabilization circuitry

1. A device, comprising:

an opto-electrical detector configured to output a first electrical signal based on a measurement of light intensity of a photonics-based component, the light intensity being proportional to an amount of detuning of the photonics-based component;

analog-to-digital conversion (ADC) circuitry configured to generate a second electrical signal by subtracting an offset value from the first electrical signal output from the opto-electrical detector, and to output a digital signal based on the second electrical signal; and

feedback control circuitry configured to tune the photonics-based component based, at least in part, on the digital signal output from the ADC circuitry; and

a digital controller configured to:

receive the digital signal output from the ADC circuitry;

generate a digital pulse sequence based, at least in part, on the received digital signal; and

provide the digital pulse sequence to the feedback control circuitry.

2. The device of claim 1 , wherein the photonics-based component is a ring resonator.

3. The device of claim 1 , wherein

the photonics-based component includes a viewport, and

the opto-electrical detector comprises a photodetector configured to detect a light intensity through the viewport.

4. The device of claim 1 , wherein the ADC circuitry further comprises an integrating capacitor configured to integrate at least a portion of the second electrical signal output from the opto-electrical detector prior to conversion to a digital signal.

5. The device of claim 4 , wherein the digital controller is further configured to set an integration time of the integrating capacitor.

6. The device of claim 4 , wherein the ADC circuitry further comprises multi-stage amplification circuitry configured to amplify a voltage stored by the integrating capacitor.

7. The device of claim 1 , wherein the ADC circuitry comprises a dual-slope integrating ADC.

8. The device of claim 1 , wherein the feedback control circuitry comprises pulse width modulation (PWM) circuitry coupled to a digital-to-analog converter (DAC).

9. The device of claim 8 , wherein the DAC has a resolution less than or equal to 8-bits.

10. The device of claim 8 , wherein the PWM circuitry is configured to perform code dithering.

11. The device of claim 1 , wherein the feedback control circuitry is configured to tune the photonics-based component by controlling a temperature of the photonics-based component.

12. The device of claim 11 , wherein the feedback control circuitry is configured to control the temperature of the photonics-based component by introducing a phase shift in the photonics-based component.

13. The device of claim 11 , wherein the feedback control circuitry includes a modulator that provides at least one of an electro-optic effect and a thermal phase shift in the photonics-based component.

14. The device of claim 13 , wherein the modulator includes at least one of a resistor, a p-n junction, and a p-i-n junction.

15. The device of claim 1 , wherein the feedback control circuitry is configured to accurately control a temperature of the photonics-based component to within 0.001 degrees Celsius.

16. The device of claim 1 , wherein the feedback control circuitry is configured to have a precision of one part per 50000 in applied power.

17. The device of claim 1 , wherein the feedback control circuitry is configured to tune the photonics-based component based on a time-averaged power generated by the feedback control circuitry.

18. A method of stabilizing a photonics-based component, the method comprising:

generating a first electrical signal based on a detected light intensity proportional to an amount of detuning of the photonics-based component;

subtracting, from the first electrical signal, an offset value to produce a second electrical signal;

amplifying the second electrical signal;

generating a digital signal based on the amplified second electrical signal; and

tuning the photonics-based component based, at least in part, on the generated digital signal.

19. The method of claim 18 , wherein the photonics-based component is a ring resonator.

20. The method of claim 18 , further comprising:

generating a digital pulse sequence based, at least in part, on the digital signal; and

tuning the photonics-based component based, at least in part, on the generated digital pulse sequence.

21. The method of claim 18 , further comprising:

integrating at least a portion of the first electrical signal prior to generating the digital signal.

22. The method of claim 21 , further comprising:

dynamically setting an integration time during which the integrating of the first electrical signal is performed.

23. The method of claim 18 , wherein amplifying the second electrical signal comprises performing multi-stage amplification.

24. The method of claim 18 , further comprising:

performing code dithering based on the generated digital signal.

25. The method of claim 18 , wherein tuning the photonics-based component comprises controlling a temperature of the photonics-based component.

26. The method of claim 25 , wherein controlling the temperature of the photonics-based component comprises introducing a phase shift in the photonics-based component.

27. The device of claim 1 , wherein the photonics-based component comprises a resonator evanescently coupled to a bus waveguide, and wherein the opto-electrical detector is coupled to the waveguide such that, when the resonator is perfectly tuned, substantially no light is detected by the opto-electrical detector.