标准单模光纤中声导波驱动的电光机械射频振荡器
Electro-opto-mechanical radio-frequency oscillator driven by guided acoustic waves in standard single-mode fiber
摘要：
提出并演示了一种基于标准单模光纤的声导模前向散射的光电射频振荡器。使用光泵浦波来激励窄带共振导声模式，其将相位调制引入到共同传播的光探测波。相位调制在Sagnac干涉仪回路的输出处被转换为强度信号。强度波形被检测、放大并驱动回调制光泵浦。在319 MHz的频率下实现振荡，这与提供探测波的最大相位调制的声学模式的谐振相匹配。在竞争声学模式的频率处的振荡被抑制至少40 dB。声共振的线宽足够窄以提供混合腔的单个纵向模式下的振荡。竞争的纵向模式也被抑制了至少38 dB。与其他光电振荡器不同，混合腔内不需要射频滤波。振荡频率完全由光纤光力学决定。
英文摘要：
An opto-electronic radio-frequency oscillator that is based on forward scattering by the guided acoustic modes of a standard single-mode optical fiber is proposed and demonstrated. An optical pump wave is used to stimulate narrowband, resonant guided acoustic modes, which introduce phase modulation to a co-propagating optical probe wave. The phase modulation is converted to an intensity signal at the output of a Sagnac interferometer loop. The intensity waveform is detected, amplified and driven back to modulate the optical pump. Oscillations are achieved at a frequency of 319 MHz, which matches the resonance of the acoustic mode that provides the largest phase modulation of the probe wave. Oscillations at the frequencies of competing acoustic modes are suppressed by at least 40 dB. The linewidth of the acoustic resonance is sufficiently narrow to provide oscillations at a single longitudinal mode of the hybrid cavity. Competing longitudinal modes are suppressed by at least 38 dB as well. Unlike other opto-electronic oscillators, no radio-frequency filtering is required within the hybrid cavity. The frequency of oscillations is entirely determined by the fiber opto-mechanics.
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