Optical temperature measurements in photonic circuits
AssigneeOpenLight Photonics, Inc.
InventorsChris Barnard, John Parker
Life of this patent
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Abstract
Temperature measurements of photonic circuit components may be performed optically, exploiting a temperature-dependent spectral property of the photonic device to be monitored itself, or of a separate optical temperature sensor placed in its vicinity. By facilitating measurements of the temperature of the individual photonic devices rather than merely the photonic circuit at large, such optical temperature measurements can provide more accurate temperature information and help improve thermal design.
Claims20
A photonic integrated circuit (PIC) comprising:
- a first optical waveguide in a device layer of a substrate;
- an active photonic device coupled to the first optical waveguide, the active photonic device comprising a diode junction;
- and
- a second optical waveguide in the device layer of the substrate, the second optical waveguide comprising an optical temperature sensor in sensing proximity to the diode junction.
A method for measuring a temperature of a photonic device in a photonic integrated circuit (PIC), the method comprising:
- coupling light into the photonic device via a first optical waveguide;
- optically interrogating an optical temperature sensor placed in sensing proximity to the photonic device via a second optical waveguide to determine a spectral property of the optical temperature sensor;
- and
- computationally converting the determined spectral property to the measured temperature based on a calibrated temperature dependence of the spectral property.
A method for measuring a temperature of a photonic device in a photonic integrated circuit (PIC), the method comprising:
- coupling a first optical signal into the photonic device in a first direction of propagation;
- using a second optical signal coupled into the photonic device in a second direction of propagation opposite the first direction of propagation, optically interrogating the photonic device to determine a spectral property of the photonic device;
- and
- computationally converting the determined spectral property to the measured temperature based on a calibrated temperature dependence of the spectral property.
Dependencies are inferred from the claim text.