本文關(guān)鍵詞：基于射頻驅(qū)動單邊帶調(diào)制器的循環(huán)掃頻光源研究　出處：《天津大學》2015年碩士論文　論文類型：學位論文

  更多相關(guān)文章： 掃頻光纖激光器 波長移頻 單邊帶調(diào)制器 循環(huán)掃頻

【摘要】：掃頻光源輸出的激光頻率以特定的步長隨時間快速變化,能夠?qū)崿F(xiàn)一定光譜范圍內(nèi)激光波長的掃描輸出,在光纖傳感、激光測量以及光學相干層析等領(lǐng)域中有著重要的應用。本文研究了利用射頻電信號控制單邊帶(SSB)調(diào)制器實現(xiàn)激光光源腔外循環(huán)掃頻輸出。該方法在激光器腔外獨立進行波長掃頻,不影響激光腔的固有結(jié)構(gòu),便于激光器自身參數(shù)的升級和優(yōu)化;波長掃頻由射頻電信號控制,可以有效避免機械掃頻的限制,實現(xiàn)掃頻步長和穩(wěn)定性的提高;同時,采用光譜分段掃描法,能夠同時獲得高精度和高速率的掃頻輸出。本文的主要內(nèi)容如下:一、光源的腔外移頻研究理論分析了SSB調(diào)制器對輸入光信號的光譜調(diào)制過程,移頻步長精確等于射頻信號頻率。實驗分別獲得了單波長信號10MHz~20GHz的移頻結(jié)果和多波長信號20MHz~18GHz的整體移頻結(jié)果。二、單波長光源腔外循環(huán)掃頻研究理論研究了基于SSB調(diào)制器的循環(huán)掃頻過程,設計了單波長光源腔外循環(huán)掃頻裝置。分別對內(nèi)調(diào)制和外調(diào)制兩種脈沖光源進行了腔外循環(huán)掃頻實驗和數(shù)據(jù)分析。掃頻步長為0.04nm時,實現(xiàn)了5.8nm范圍內(nèi)光譜平坦度為?1.5dB,掃頻頻率18.5kHz的掃頻輸出。分析了噪聲對循環(huán)掃頻輸出的影響,提出并初步實驗驗證了利用未泵浦摻鉺光纖作跟隨式濾波器抑制自發(fā)輻射噪聲的方法。三、多波長光源腔外循環(huán)掃頻研究設計構(gòu)建了雙波長光源腔外循環(huán)掃頻實驗裝置。獲得了1.6nm范圍內(nèi)0.08nm掃頻步長時214kHz的雙波長掃頻輸出,以及0.04nm掃頻步長時122kHz的雙波長掃頻輸出。設計了基于多波長光源的腔外循環(huán)掃頻實驗裝置。初步將連續(xù)多波長光進行循環(huán)掃頻,獲得了23nm范圍內(nèi)57個波長的掃頻輸出,光譜平坦度小于?5dB。
[Abstract]:The laser frequency of the sweep light source changes rapidly with the specific step length, which can realize the scanning output of the laser wavelength in a certain spectral range, and it can be sensed in the optical fiber. Laser measurement and optical coherence tomography have important applications. In this paper, the control of SSBs with single sideband by radio frequency (RF) signal is studied. The modulator realizes the frequency sweep output of laser source outside the cavity, and the wavelength sweep is carried out independently outside the laser cavity. It does not affect the inherent structure of the laser cavity and is convenient to upgrade and optimize the laser parameters. Wavelength sweep is controlled by radio frequency signal, which can effectively avoid the limitation of mechanical frequency sweep and improve the sweep step and stability. At the same time, the spectral piecewise scanning method can be used to obtain high precision and high speed sweep output. The main contents of this paper are as follows: 1. The spectral modulation process of input light signal by SSB modulator is analyzed theoretically. The accuracy of the frequency shift step is equal to the frequency of the radio frequency signal. The frequency shift results of the single-wavelength signal 10MHz ~ 20GHz and the multi-wavelength signal of 20MHz ~ 18GHz are obtained respectively. 2. The theory of frequency sweep outside the cavity of single wavelength light source is studied. The cyclic frequency sweep process based on SSB modulator is studied. In this paper, a single wavelength light source extracavity frequency sweep device is designed. The experiment and data analysis of the two pulse light sources are carried out. The sweep step is 0.04nm. The spectral flatness in the range of 5.8 nm has been achieved. 1.5 dB, the frequency sweep output of 18.5 kHz. The effect of noise on the frequency sweep output is analyzed. The method of using unpumped erbium-doped fiber as a follower filter to suppress spontaneous emission noise is proposed and preliminarily verified by experiments. 3. Study and Design of Multi-wavelength Light Source Extracavity Cycling Frequency sweep experiment device with double wavelength Light Source external Circulation Frequency sweep is designed and constructed, and the double-wavelength sweep frequency output of 214kHz with 0.08nm sweep step is obtained in the range of 1.6nm. . And the double wavelength sweep output of 122 kHz at 0.04nm sweep step. The experiment device of frequency scanning outside cavity based on multi-wavelength light source is designed. The continuous multi-wavelength light is preliminarily used to sweep the frequency. The sweep frequency output of 57 wavelengths in the range of 23 nm is obtained, and the spectral flatness is less than? 5dB.
【學位授予單位】：天津大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TN761;TN24

【引證文獻】

相關(guān)碩士學位論文 前1條

1 張雨辰;連續(xù)光二次相位調(diào)制技術(shù)的研究與應用[D];天津大學;2015年

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本文編號：1376802