The Anesthesia Machine and Circle System Are Not Likely to be Sources of Bacterial Contamination

Abstract

An experimental analysis on the quality of 40-GHz radio-frequency\nsignals generated by various passively mode-locked semiconductor lasers\nis addressed. The analysis is performed considering the frequency\nlinewidth of 40-GHz optically generated signals and the number of\nlongitudinal modes selected by the cavity of each laser under study.\nFour of these devices are multi-quantum wells InAlGaAs\nFabry-Pérot lasers. They have been engineered to exhibit a\nspecific number of longitudinal modes: 4, 5, 10, and 22 modes,\nrespectively. Another device under test is a bulk distributed Bragg\nreflector laser exhibiting 3 lasing modes. The last device under study\nis a quantum-dash Fabry-Pérot laser characterized by 40 lasing\nmodes. From our experimental results it appears that, regardless the\nnature of the device cavity and active media, the strength of the\npassively mode-locked mechanism might be enhanced with the number of\nlongitudinal modes oscillating into the laser cavity, allowing a\nreduction in the frequency linewidth.