Abstract
Based on the polarization conversion in a tapered fiber-coupled whispering gallery mode (WGM) system, a simple-structured narrow linewidth band-pass filter was fabricated and a narrow linewidth ring laser was demonstrated. With a fiber Bragg grating (FBG) to further select the resonant mode, the ring laser could be in the single-longitudinal-mode with the linewidth about 6 kHz and its wavelength could be tuned from 1540.10 nm to 1570.01 nm. Benefit from the dense modes in the WGM resonator, high conversion efficiency, and better stability of the structure, a tunable dual-wavelength laser could be achieved based on two FBGs with different resonant wavelengths. The configuration of the proposed laser is simple and stable, which will benefit its applications in the future.
Highlights
Single-longitudinal-mode (SLM) narrow-linewidth lasers have been widely used in areas such as coherent communication [1], metrology [2,3] and especially sensing applications [4,5,6,7,8]
Backscattering of the whispering gallery mode (WGM) could provide a band-pass feature [14], the structures of the add–drop filter (ADF) based on a coupled WGM resonator system are more preferred for its high efficiency
The ADF filter based on the WGM includes at least two channels: one is through the channel, which usually provides the band-reject feature, and the other is the drop channel, which provides the band-pass feature
Summary
Single-longitudinal-mode (SLM) narrow-linewidth lasers have been widely used in areas such as coherent communication [1], metrology [2,3] and especially sensing applications [4,5,6,7,8]. Considering the development of the whispering gallery mode (WGM) resonators in recent years [9,10,11,12], they have been widely used in the configuration of narrow-linewidth lasers due to their high Q-factor, which can be up to 105 times larger than that of the FP cavity.
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