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Implementation of a widely tunable microwave signal generator based on dual-polarization fiber grating laser

机译：基于双偏振光纤光栅激光器的可调谐微波信号发生器的实现

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In this paper, we demonstrate the implementation of a widely tunable microwave signal generator based on a dual-polarization fiber grating laser. The laser contains two strong, wavelength-matched Bragg gratings photoinscribed in an Er-doped fiber and emits two polarization modes when pumped with a 980 nm laser diode. By beating the two modes, a microwave signal with a signal-to-noise ratio over 60 dB can be obtained. For a free running laser the fluctuations in intensity and frequency of the microwave signal are +/- 1 dB and +/- 5 kHz, respectively, and the noise level is about -40 dBc/Hz at 1 kHz. The frequency can be continuously tuned from 1.8 to 15.1 GHz, by transversely loading the laser cavity and changing the intracavity birefringence by use of a piezoelectric transducer-based mechanical device. The measured response time rate of tuning is about 90 MHz/mu s and the intensity fluctuation at different frequencies is less than +/- 1.5 dB. The frequency fluctuation under loading is controlled within 1 MHz by introducing an electrical feedback. (C) 2015 Optical Society of America
机译：在本文中，我们演示了基于双偏振光纤光栅激光器的可广泛调谐的微波信号发生器的实现。该激光器包含两个坚固的，波长匹配的布拉格光栅，这些光栅被光刻在掺Er光纤中，并在用980 nm激光二极管泵浦时发出两种偏振模式。通过击败这两种模式，可以获得信噪比超过60 dB的微波信号。对于自由运行的激光器，微波信号的强度和频率的波动分别为+/- 1 dB和+/- 5 kHz，并且在1 kHz时的噪声水平约为-40 dBc / Hz。通过横向加载激光腔并使用基于压电换能器的机械设备改变腔内双折射，可以将频率从1.8 GHz连续调谐到15.1 GHz。测得的调谐响应时间约为90 MHz /μs，不同频率下的强度波动小于+/- 1.5 dB。通过引入电反馈，可将负载下的频率波动控制在1 MHz以内。 （C）2015年美国眼镜学会

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