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Patent

On-Chip Temperature-Insensitive Read-Out

A temperature compensation method for wavelength monitoring using spectrometers (33) on photonic integrated chips (1) and a related temperature-compensated wavelength monitoring device (51) are disclosed. An optical filter (42a-b) of the chip (1) filters a source (6) signal to provide at least one spectral reference line to a first spectrometer (33) to detect thermal wavelength drifts thereof. At least one spectral line to be monitored is received by the same or another spectrometer (33) of the chip to detect wavelength shifts thereof. To obtain a compensation value accounting for a change in temperature, the detected thermal drift of the reference line is compared to calibrated thermal drifts for the reference line which is associated with a calibrated thermal drift for the spectral response curve of the spectrometer receiving the spectral line to be monitored. A thermal drift rate for the response curve of the optical filter differs from a thermal drift rate for the response curve of the first spectrometer at least by an amount such that, over the entire range of operating temperatures of the photonic integrated chip (1), an effective resolving power associated with the spectrometer (33) receiving the spectral line to be monitored is at least 50% of a nominal resolving power in respect of that same spectrometer (33).
Patent Publication Number: WO2021099369
Year filing: 2021
Year approval: 2022
Year publication: 2021
Status: Requested
Technology domains: Measurement, Optics
Validated for IOF-key: Yes
Attributed to: Associatie Universiteit Gent