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首页> 外文期刊>Laser Physics: An International Journal devoted to Theoretical and Experimental Laser Research and Application >Tunable ultra-narrow linewidth microwave generation from a double-loop Brillouin fiber laser
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Tunable ultra-narrow linewidth microwave generation from a double-loop Brillouin fiber laser

机译:双回路布里渊光纤激光器产生可调谐的超窄线宽微波

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摘要

A simple photonic approach to generate an ultra-narrow linewidth microwave signal is proposed and experimentally demonstrated. In this scheme, a multi-wavelength Brillouin fiber laser (BFL) with a double-loop and un-pumped polarization maintaining erbium doped fiber (PM-EDF) is used. The double-loop configuration includes a 50 m long single-mode fiber (SMF) and a 10 m long SMF as Brillouin gain. The threshold and linewidth of the microwave source can be improved by using a double loop, while a 4 m long un-pumped PM-EDF is used to suppress unwanted side-modes. A dual-wavelength optical signal is heterodyned at the high-speed photo detector to produce a microwave signal by adjusting the polarization controller and the wavelength of the Brillouin pump. As a result, a tunable microwave signal from 10.605 to 10.887 GHz can be obtained. The linewidth of the microwave signal is about 14.4 kHz, and the side-mode suppression ratio is about 30 dB.
机译:提出并通过实验证明了一种产生超窄线宽微波信号的简单光子方法。在该方案中,使用了具有双环路和无泵浦偏振保持maintaining掺杂光纤(PM-EDF)的多波长布里渊光纤激光器(BFL)。双环路配置包括一个50 m长的单模光纤(SMF)和一个10 m长的SMF作为布里渊增益。微波源的阈值和线宽可以通过使用双环路来改善,而使用4 m长的未泵浦PM-EDF来抑制不需要的副模。通过调节偏振控制器和布里渊泵浦的波长,双波长光信号在高速光电检测器中进行外差处理,以产生微波信号。结果,可以获得从10.605到10.887 GHz的可调微波信号。微波信号的线宽约为14.4 kHz,侧模抑制比约为30 dB。

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