Multiwavelength Brillouin–Erbium Fiber Laser Temperature Sensor With Tunable and High Sensitivity


A multiwavelength Brillouin-erbium fiber laser (MBEFL) temperature sensor with high and tunable sensitivity has been developed and experimentally demonstrated in this paper. Thanks to rigid Brillouin frequency shift spacing of MBEFLs, MBEFLs are very suitable for temperature sensing and can be used to understand high and tunable sensing sensitivity. By monitoring the middle frequency shift of the beat signal spectrum of the 2 same-order Brillouin Stokes waves coming from the sensing MBEFL and the reference one, the high and tunable sensitivity has been realized. The proposed tunable temperature sensor realizes a finer tuning step. It shows a high stability and provides a sensing sensitivity of thirteen.08 MHz/°C and a tuning step of one.09 MHz/°C. At 12th-order sensitivity, the temperature error is concerning zero.twenty three °C (±zero.115 °C), and also the temperature resolution is regarding 0.765 °C.

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