A novel-configuration multi-wavelength Brillouin erbium fiber laser and its application in switchable high-frequency microwave generation |
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| Authors: | J Fu D Chen B Sun and S Gao |
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| Institution: | 1.Centre for Optical and Electromagnetic Research, State Key Laboratory of Modern Optical Instrumentation,Zhejiang University,Hangzhou,China;2.Joint Research Laboratory of Optics of Zhejiang Normal University and Zhejiang University,Zhejiang University,Hangzhou,China;3.Institute of Information Optics,Zhejiang Normal University,Jinhua,China |
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| Abstract: | A novel configuration of compound-cavity multi-wavelength Brillouin erbium fiber laser is proposed and experimentally demonstrated.
With an incident optical carrier power of 8 dBm, at least 14 lasing lines are obtained with a wavelength spacing of ∼0.08
nm. Stability and power uniformity of the multi-wave-length lasing are ensured by the flat hybrid gain of Brillouin and erbium,
the compound-cavity structure, and the four-wave mixing suppression using a long (10 km) single-mode fiber. A stable and frequency-switchable
microwave can be achieved by incorporating a fiber Bragg grating filter to select the desired nth-order Stokes wave and beating it with the optical carrier at a photodetector. In our experiment, the 1st-4th-order Stokes
waves are filtered respectively and hence a high-quality microwave with a switchable frequency from ∼10 to ∼40 GHz and a tuning
step of ∼10 GHz is achieved. The signal-to-noise ratio is measured to be >25 dB. |
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