Photonic integrated chip for spectroscopy

An optical sensor for a spectroscopic analysis of a sample, the optical sensor comprising:

• a photonic integrated chip (PIC) for providing light to the sample, the PIC comprising:
• one or more laser(s) disposed on the PIC and configured to operate to output laser light at one or more respective predetermined wavelength(s), each of the one or more laser(s) having an output that is optically coupled to an optical output of the PIC;
• a monitor disposed on the PIC and comprising a wavemeter disposed on the PIC and providing output to a photodiode likewise disposed on the PIC, the monitor configured to determine the wavelength of the optical output of each of the one or more laser(s);
• and
• a detector disposed on the PIC and configured to collect a spectrum from the sample;
• and
• one or more processors configured to:
• compare the wavelength of the laser(s) at the optical output with each of their respective predetermined wavelength(s);
• and
• in accordance with a determination that a deviation above a threshold is detected between the wavelength of the laser(s) and the predetermined wavelength(s), adapt the collected spectrum to generate a reconstructed spectrum;
• and
• use one or more datapoints from the reconstructed spectrum for the spectroscopic analysis.