title: Maintaining maximum signal-to-noise ratio in uncooled vertical-cavity surface-emitting laser-based self-mixing sensors.
abstract: We demonstrate a method for maintaining the maximum signal-to-noise ratio (SNR) of the signal obtained from the self-mixing sensor based on a vertical-cavity surface-emitting laser (VCSEL). It was found that the locus of the maximum SNR in the current-temperature space can be well approximated by a simple analytical model related to the temperature behavior of the VCSEL threshold current. The optimum sensor performance is achieved by tuning the laser current according to the proposed model, thus enabling the sensor to operate without temperature stabilization in a wide temperature range between -20 °C and +80 °C.
authors.affiliation: The University of Queensland, School of Information Technology and Electrical Engineering, Brisbane, QLD, Australia.
authors.forename: Ranveer S
authors.initials: RS
authors.lastname: Matharu
authors.forename: Julien
authors.initials: J
authors.lastname: Perchoux
authors.forename: Russell
authors.initials: R
authors.lastname: Kliese
authors.forename: Yah Leng
authors.initials: YL
authors.lastname: Lim
authors.forename: Aleksandar D
authors.initials: AD
authors.lastname: Rakić