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摘要:
为了使微波光子滤波器兼具宽调谐范围与高频率选择性，本文基于窄线宽单纵模光纤受激布里渊振荡器首次提出并验证了一种具有宽调谐范围、窄滤波带宽特性的微波光子滤波器。该滤波器的核心是腔长为10 m的布里渊光纤振荡器，受激布里渊散射泵浦光与光载波信号分别由两个不同的可调谐 器提供，布里渊增益与光调制信号相互作用后，利用该布里渊光纤振荡器压缩光谱线宽，实现窄带微波光子滤波；通过简单地改变泵浦光波长，实现滤波器通带大范围稳定调谐。实验结果表明，该微波光子滤波器在0~20 GHz的频率范围内可稳定调谐，带外抑制比约为20 dB，其3-dB带宽和最大
Q 值分别为6.2 kHz和3.222×106。本文提出的单通带微波光子滤波器不仅具有目前已知的最高Q 值，同时具有宽可调性、高带外抑制和结构简单等优势。-
关键词:
- 受激布里渊散射(SBS) /
- 微波光子滤波器(MPF) /
- 宽调谐 /
- 带外抑制比 /
- 窄带宽
Abstract:In order to make sure a microwave photonic filter both have wide tuning range and high frequency selectivity, a microwave photonic filter with a wide tuning range and narrow filter bandwidth based on a Brillouin oscillator is proposed and verified for the first time. The core of the filter is a Brillouin fiber oscillator with a cavity length of 10 m, and the stimulated Brillouin scattering pump and optical carrier signal are provided by two different tunable lasers. After the Brillouin gain spectrum interacts with the optical modulation sideband, the Brillouin fiber oscillator is used to narrow the spectral linewidth to realize narrowband microwave photonic filtering. By changing the pump wavelength, the filter passband can be tuned stably. The experimental results show that the microwave photonic filter can be stably tuned in the frequency range of 0−20 GHz. The out-of-band rejection ratio is found to be about 20 dB, and its 3-dB bandwidth and maximum
Q value are 6.2 kHz and 3.222×106, respectively.To the best of our knowledge, this is the highest value of a high-Q single-passband MPF reported to date. At the same time, the MPF has the advantages of wide tunability, high side mode suppression and a simple structure. -
图 1 MPF的实验装置。TLS，可调谐 器；PC，偏振控制器；PM，相位调制器；OC，光耦合器；SMF，单模光纤；EDFA，掺铒光纤放大器；Cir，光环形器；PD，光电探测器；OSA，光谱分析仪；VNA，矢量网络分析仪
Figure 1. Experimental setup of MPF. TLS, tunable laser; PC, polarization controller; PM, phase modulator; OC, optical coupler; SMF, single-mode fiber; EDFA, erbium-doped fiber amplifier; Cir, optical circulator; PD, photodetector; OSA , spectrum analyzer; VNA, vector network analyzer
图 2 可调谐窄带MPF原理示意图。（a）双边带扫频调制光信号光谱；（b）SBS光谱；（c）利用SBS放大DSB调制信号上边带；（d）环形腔R1的FSR响应；（e）MPF滤波通带响应
Figure 2. Illustration of tunable narrowband MPF principle. (a) Optical spectra of double sideband swept frequency modulated signal. (b) Optical spectra of SBS. (c) Amplification of the upper sideband of a DSB modulated signal using SBS gain. (d) FSR response of single-ring cavity R1. (e) Response of MPF
图 3 （a）通过FSR抑制边模原理示意图；（b）基于布里渊光纤振荡器的MPF频率响应示意图
Figure 3. (a) Schematic diagram of side mode suppression by FSR. (b)The response of MPF based on Brillouin fiber oscillator
图 4 布里渊增益和布里渊光纤振荡器输出光频谱对比
Figure 4. Comparison of Brillouin gain and output light spectra of Brillouin fiber oscillator
图 5 TLS泵浦光谱、布里渊振荡器输出光谱及经过耦合器OC3的合路输出光谱
Figure 5. TLS pump spectrum, Brillouin laser output spectrum and combined output spectrum through coupler OC3
图 6 泵浦光波长在1550.232 nm至1550.392 nm之间调谐时MPF的频率响应
Figure 6. The frequency response of MPF when the wavelength of the pump light is tuned from 1550.232 nm to 1550.392 nm.
图 7 当泵浦光的波长在1550.214 nm至1550.392 nm之间变化时，MPF的频率响应。（a）20 GHz跨度内的总体对比图；（b）30 MHz跨度展宽图
Figure 7. Frequency response of MPF when the wavelength of the pump light varies from 1550.214 nm to 1550.392 nm. (a) Overall comparison diagram in 20 GHz span，(b) expanded diagram with 30 MHz span
图 8 不同中心频率下的3 dB带宽和边模抑制比
Figure 8. 3-dB bandwidth and side mode suppression ratio at different center frequencies
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