High-Precision Frequency-Tunable Single-Longitudinal-Mode DBR Fiber Laser for a Tuning Range of 116 GHz
In this paper,the controllable frequency-tuning and laser output characteristics of a single-longitudinal-mode distributed Bragg reflector(DBR)fiber laser with a piezoelectric ceramic that axially stretches across a DBR fiber resonant cavity are investigated.Our theoretical analysis shows that this tuning scheme can effectively prevent the occurrence of mode hopping during frequency tuning,which is beneficial for obtaining a wider frequency-tuning range without mode hopping.Additionally,experimental results verify that this tuning mechanism can achieve fast and controllable frequency tuning of the DBR fiber laser over a wide range without mode hopping.The maximum mode-hop-free frequency-tuning range obtained in our experiment is as high as 116 GHz.During the frequency-tuning process,changes in the linewidth and relative intensity noise of the laser are not significant;furthermore,large fluctuations in the output laser power can be effectively suppressed using a boost fiber-optic amplifier.
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