Photonic temperature and wavelength metrology by spectral pattern recognition

Optics Express
Siegfried JanzDaniele Melati

Abstract

Spectral pattern recognition is used to measure temperature and generate calibrated wavelength/frequency combs using a single silicon waveguide ring resonator. The ring generates two incommensurate interleaving TE and TM spectral combs that shift independently with temperature to create a spectral pattern that is unique at every temperature. Following an initial calibration, the ring temperature can be determined by recognizing the spectral resonance pattern, and as a consequence, the wavelength of every resonance is also known. Two methods of pattern-based temperature retrieval are presented. In the first method, the ring is locked to a previously determined temperature set-point defined by the coincidence of only two specific TE and TM cavity modes. Based on a prior calibration at the set-point, the ring temperature and hence all resonance wavelengths are then known and the resulting comb can be used as a wavelength calibration reference. In this configuration, all reference comb wavelengths have been reproduced within a 5 pm accuracy across an 80 nm range by using an on-chip micro-heater to tune the ring. For more general photonic thermometry, a spectral correlation algorithm is developed to recognize a resonance pattern acr...Continue Reading

References

Oct 18, 2012·Optics Letters·Aleksandr BibermanMichael R Watts
Aug 10, 2017·Optics Express·Richard A McCrackenDerryck T Reid
Dec 20, 2017·Sensors and Actuators. A, Physical·Nikolai KlimovZeeshan Ahmed
Feb 12, 2019·Nature Photonics·Myoung-Gyun SuhKerry Vahala

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