基于偏振自穩(wěn)定雙環(huán)的受激Brillouin散射光電振蕩器

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摘要：基于偏振自穩(wěn)定雙環(huán)結構提出一種受激Brillouin散射（SBS）光電振蕩器（OEO），利用SBS的窄帶寬增益譜實現(xiàn)相位調(diào)制到強度調(diào)制的轉換（PM-IM），并選擇OEO的振蕩模式，構造偏振自穩(wěn)定雙環(huán)結構，在每個回路中的輸入光被45°Faraday旋轉鏡反射后，將通過45°Faraday旋轉器和不同長度單模光纖返回其路徑，保證輸出信號和輸入信號的偏振態(tài)始終相差180°，從而消除外界機械振動和溫度干擾.由于環(huán)路結構為反射式往返傳輸，因此所需光纖長度縮短1/2.實驗結果表明，該OEO通過改變泵浦光波長實現(xiàn)頻率調(diào)諧，可產(chǎn)生1～16GHz的微波信號，10GHz處邊模抑制比（SMSR）達67.14dB，相位噪聲為-116.3 dBc/Hz@10 kHz.

關鍵詞：受激Brillouin散射；光電振蕩器；偏振自穩(wěn)定；雙環(huán)

中圖分類號：O437文獻標志碼：A文章編號：1671-5489（2024）05-1241-07

Stimulated Brillouin Scattering Optoelectronic Oscillator Based on Self-polarization-stabilization Dual-Loop

HAN Lu'，LIU Lu2

（1.Editorial De part ment of Journal，Jilin Provincial Institute of Education，Changchun 130022，China;2.School of Energy and Power Engineering，Changchun Institute of Technology，Changchun 130012，China）

Abstract：We proposed a stimulated Brillouin scattering（SBS）optoelectronic oscillator（OEO）based on a self-polarization-stabilization dual-loop structure.By utilizing the narrow bandwidth gain spectrum of SBS to achieve the conversion from phase modulation to intensity modulation（PM-IM），and selecting the oscillation mode of the OEO.A polarization self-polarization-stabilization dual-loop structure was constructed.After the input light in each loop was reflected by a 45°Faraday rotator mirror.It would return to its path through a 45°Faraday rotator and different lengths of single-mode fiber，ensuring that the polarization state of the output signal and the input signal always differed by 180°，thereby eliminating external mechanical vibrations and temperature disturbances.Since the loop structure was reflective and bidirectional，the required fiber length was reduced by half.The experimental results show that the OEO can achieve frequency tuning by changing the pump wavelength，and can generate microwave signals of 1-16 GHz，with a side mode suppression ratio（SMSR）of 67.14 dB at 10 GHz，and a phase noise of-116.3 dBc/Hz@10 kHz.

Keywords：stimulated Brillouin scattering;optoelectronicoscillator;self-polarization-stabilization;dual-loop

光電振蕩器（OEO）可產(chǎn)生高光譜純度和低相位噪聲的微波和毫米波信號[，在無線通信[5、光信號處理、雷達和現(xiàn)代儀器等領域應用廣泛.傳統(tǒng)的單回路OEO由一個強度調(diào)制器（IM）、長度為幾百米的單模光纖（SMF）、一個光電二極管（PD）和一個電帶通濾波器組成.光纖是儲能組件，較長光纖會產(chǎn)生更高的光譜純度信號。（剩余8433字）