本文選題：光纖延遲線 + 精度　； 參考：《電子科技大學(xué)》2015年碩士論文

【摘要】：引入基于光纖延遲線的光實時延遲(OTTD)移相技術(shù),實現(xiàn)光移相代替電移相可以很好地解決相控陣?yán)走_天線波束偏斜和信號展寬問題,極大地提高雷達的瞬時信號帶寬。光纖延遲線在應(yīng)用過程中,對環(huán)境適應(yīng)能力的優(yōu)劣直接影響到其所在儀器或裝備的性能。研究高精度光纖延遲線及其環(huán)境適應(yīng)性,提高可靠性至關(guān)重要。本文首先搭建了基于矢量網(wǎng)絡(luò)分析儀相位法測量的光纖延遲線研制實驗平臺,單點光纖延遲精度達±0.1ps。分析磁光開關(guān)狀態(tài)誤差,設(shè)計和優(yōu)化延遲線拓撲結(jié)構(gòu),研制出步進為10ps的高精度5-bit光纖延遲線,延遲精度為±1.1ps,誤差均方差為0.68ps,平均插損為5.42dB,幅度一致性為0.49dB。然后,分析了光纖延遲溫度特性和磁光開關(guān)的經(jīng)典光路,指出溫度發(fā)生變化時,引起磁光開關(guān)附加損耗的三種原因:溫致45?旋光波片旋光角度偏移、溫致磁光晶體旋光角度偏移和溫致光纖耦合空間錯位。結(jié)合相應(yīng)的晶體溫度特性及光纖模場耦合效率,公式理論推出這三種原因給磁光開關(guān)帶來的附加損耗大小,分析發(fā)現(xiàn)溫度對5-bit光纖延遲線的影響很小。之后,分析了空間輻照環(huán)境中光學(xué)材料的輻照效應(yīng)、色心的形成和延遲線器件受輻照后的性能表現(xiàn)。結(jié)合硅材料E’色心動力學(xué)模型和在前人光纖輻照特性實驗的基礎(chǔ)上分析了5-bit光纖延遲線輻照特性,并提出抗輻照建議。最后,搭建了5-bit光纖延遲線及其分立元件(光纖、磁光開關(guān)、光纖分路器和波分復(fù)用器)溫度、輻照實驗系統(tǒng)。在-5℃~55℃溫度范圍內(nèi),兩個磁光開關(guān)溫致附加損耗分別為0.16dB和0.41dB;光纖分路器和波分復(fù)用器的溫致附加損耗在0.1dB以內(nèi);5-bit光纖延遲線延遲誤差為2.2ps,誤差均方差為0.4~0.5ps,損耗在5~6dB之間,幅度一致性為1dB,溫致附加損耗在0.5dB以內(nèi),測試結(jié)果顯示溫度對小步進5-bit光纖延遲線的影響很小。在0~120krad輻照劑量下,光纖延遲線及其分立元件輻照附加損耗不斷增加,磁光開關(guān)、光纖分路器的輻致?lián)p耗在1dB左右,波分復(fù)用器在輻致?lián)p耗在4dB左右,但是5-bit光纖延遲線輻照附加損耗達到了19dB,并且1.55mm厚度的鋁殼不能有效屏蔽輻照給器件帶來的損傷。
[Abstract]:The optical real-time delay OTTD phase shifting technology based on optical fiber delay line is introduced to realize optical phase shift instead of electric phase shift, which can solve the problems of antenna beam deflection and signal broadening of phased array radar, and greatly improve the instantaneous signal bandwidth of phased array radar. In the process of application, the adaptability of optical fiber delay lines to the environment has a direct impact on the performance of their instruments or equipment. It is very important to study the high precision optical fiber delay line and its environmental adaptability to improve the reliability. In this paper, the experimental platform of optical fiber delay line based on phase measurement of vector network analyzer is built. The precision of single point fiber delay is 鹵0.1 ps. The state error of magneto-optic switch is analyzed, and the topology of delay line is designed and optimized. A high-precision 5-bit fiber delay line with step 10ps is developed. The delay precision is 鹵1.1 pss, the error mean square deviation is 0.68 pss, the average insertion loss is 5.42 dB, and the amplitude consistency is 0.49 dB. Then, the delay temperature characteristics of optical fiber and the classical optical circuit of magneto-optic switch are analyzed, and three reasons for the additional loss of magneto-optic switch are pointed out when the temperature changes: temperature-induced 45? The optical rotation angle migration of the rotatory wave plate, the rotation angle migration of the temperature induced magneto-optic crystal and the spatial dislocation of the thermally induced fiber coupling are investigated. Combined with the temperature characteristics of the crystal and the coupling efficiency of the fiber mode field, the additional loss of the magneto-optic switch caused by these three reasons is deduced by the formula theory. It is found that the temperature has little effect on the 5-bit fiber delay line. After that, the radiation effect of optical materials, the formation of color center and the performance of delay line devices after irradiation are analyzed. Combined with the E'color center kinetic model of silicon materials and based on the experiments of previous optical fiber irradiation characteristics, the radiation characteristics of 5-bit fiber delay line are analyzed, and the anti-irradiation suggestions are put forward. Finally, the temperature of 5-bit fiber delay line and its discrete elements (optical fiber, magneto-optic switch, fiber splitter and wavelength demultiplexer) and the irradiation experiment system are built. In the temperature range of -5 鈩，

本文編號：1939201