【摘要】：光學(xué)頻率梳是指一系列具有固定譜線間隔的相干譜線,且譜線之間具有穩(wěn)定的相位關(guān)系。從頻域上來看,光學(xué)頻率梳是一個相干性能良好的大帶寬的梳狀譜,由多個頻率分量組成,因此可以用來作為密集波分復(fù)用(DWDM)系統(tǒng)的光源；而從時(shí)域上來看,光學(xué)頻率梳則對應(yīng)為一個超短脈沖序列,可以很好地用來作為光時(shí)分復(fù)用(OTDM)系統(tǒng)的光源。隨著激光技術(shù)的日益成熟以及光通信技術(shù)的不斷發(fā)展,光學(xué)頻率梳由于其廣泛的應(yīng)用前景吸引了越來越多人的關(guān)注,光學(xué)頻率梳也成為繼超短脈沖激光問世之后激光技術(shù)領(lǐng)域的又一重大突破。由于光頻率在頻域上展現(xiàn)出較大的帶寬,因此可以通過對頻譜的幅度和相位進(jìn)行調(diào)控從而實(shí)現(xiàn)光子模擬信號處理。光子模擬信號處理充分利用了光子的巨大帶寬資源、避免了電子瓶頸帶來的限制、提高了系統(tǒng)的實(shí)時(shí)性,因此在全光通信網(wǎng)絡(luò)中占有舉足輕重的地位。此外,硅基波導(dǎo)由于具有結(jié)構(gòu)緊湊、可集成且能與傳統(tǒng)的互補(bǔ)金屬氧化物半導(dǎo)體(CMOS)工藝兼容等優(yōu)點(diǎn),近年來也越來越受到人們的關(guān)注。光子集成電路用于光子模擬信號處理也打開了實(shí)現(xiàn)超高速和超寬帶信號處理的可能性。未來的光電子器件也將朝著微型化和集成化發(fā)展。本論文重點(diǎn)研究高性能光學(xué)頻率梳的產(chǎn)生方法,以及結(jié)合硅基光子器件探索光學(xué)頻率梳在光子模擬信號處理中的應(yīng)用。主要的研究內(nèi)容如下：(1)詳細(xì)介紹了光學(xué)頻率梳的特點(diǎn)和性質(zhì),以及其研究背景與意義,并概述了光學(xué)頻率梳的研究現(xiàn)狀。總結(jié)了幾種常用的產(chǎn)生光學(xué)頻率梳的方案,并簡要對比分析了這些方案各自的優(yōu)缺點(diǎn)。此外,簡要介紹了開展光子模擬信號處理研究的意義,以及常用的實(shí)現(xiàn)光子模擬信號處理的方法,并總結(jié)了目前國內(nèi)外在光子模擬信號處理方面取得的進(jìn)展。(2)對高非線性光纖(HNLF)在光學(xué)頻率梳產(chǎn)生中的應(yīng)用進(jìn)行了實(shí)驗(yàn)研究。提出了利用HNLF中的級聯(lián)四波混頻效應(yīng)產(chǎn)生光學(xué)頻率梳的方案、利用HNLF中的自相位調(diào)制效應(yīng)產(chǎn)生光學(xué)頻率梳的方案以及同時(shí)利用HNLF中的級聯(lián)四波混頻和自相位調(diào)制效應(yīng)產(chǎn)生光學(xué)頻率梳的方案。通過實(shí)驗(yàn)對比分析了HNLF中級聯(lián)四波混頻和自相位調(diào)制效應(yīng)對于產(chǎn)生的光學(xué)頻率梳的性能影響。實(shí)驗(yàn)結(jié)果顯示,HNLF中的級聯(lián)四波混頻和自相位調(diào)制效應(yīng)均能產(chǎn)生大帶寬的光學(xué)頻率梳,且均具備中心波長以及頻率間隔可調(diào)諧。在相同泵浦功率和重復(fù)頻率的前提下,基于HNLF中的級聯(lián)四波混頻效應(yīng)能產(chǎn)生更多的頻率譜線；而基于HNLF中的自相位調(diào)制效應(yīng)能得到更平坦的光學(xué)頻率梳。此外,對應(yīng)到時(shí)域上,基于這兩種非線性效應(yīng)均能得到超短脈沖輸出,且脈寬可調(diào)諧。(3)提出了一種使用級聯(lián)時(shí)域透鏡產(chǎn)生光學(xué)頻率梳的方案。首先基于空間-時(shí)間二元性和時(shí)域-頻域二元性,詳細(xì)介紹了時(shí)域透鏡的概念、時(shí)域成像的條件以及頻域泰伯(Talbot)效應(yīng)成立的條件。利用兩個時(shí)域透鏡級聯(lián),分別實(shí)現(xiàn)了頻域-時(shí)域映射和頻域Talbot效應(yīng)。頻域-時(shí)域映射得到了多頻率分量輸出；在此基礎(chǔ)上,再利用頻域Talbot效應(yīng),對頻率間隔進(jìn)行進(jìn)一步分割,產(chǎn)生新的頻率分量,實(shí)現(xiàn)譜線數(shù)量成倍增加。實(shí)驗(yàn)結(jié)果表明,基于級聯(lián)時(shí)域透鏡能產(chǎn)生光學(xué)頻率梳,且譜線數(shù)量和頻率間隔均能實(shí)現(xiàn)靈活調(diào)諧。(4)使用硅基光子器件作為頻譜調(diào)控器件,開展了光學(xué)頻率梳在光子模擬信號處理中的應(yīng)用研究,實(shí)現(xiàn)了一階光學(xué)微分器、一階光學(xué)希爾伯特變換、可調(diào)諧分?jǐn)?shù)階微分器以及簡單的光學(xué)任意波形產(chǎn)生。其中,基于單個微盤諧振器,既能實(shí)現(xiàn)一階光學(xué)微分也能實(shí)現(xiàn)一階光學(xué)希爾伯特變換,且首次從實(shí)驗(yàn)上驗(yàn)證了兩者之間的聯(lián)系與區(qū)別。實(shí)驗(yàn)結(jié)果顯示,當(dāng)輸入信號具有較大脈寬時(shí),單個微盤諧振器可以用來作為光學(xué)微分器；當(dāng)輸入信號具有較小脈寬時(shí),單個微盤諧振器能用來作為光學(xué)希爾伯特變換器。(5)首次提出了一種基于光學(xué)頻率梳和電調(diào)微環(huán)諧振器來實(shí)現(xiàn)時(shí)域隱身的方案。提出將光學(xué)頻率梳與電調(diào)微環(huán)諧振器結(jié)合,代替時(shí)域透鏡的功能,模擬分析了其實(shí)現(xiàn)時(shí)域隱身的可行性。并進(jìn)一步從實(shí)驗(yàn)上,實(shí)現(xiàn)了對時(shí)鐘信號和數(shù)據(jù)信號的時(shí)域隱身。
[Abstract]:Optical frequency comb is a series of coherent spectral lines with fixed spectral line spacing and stable phase relationship between them.In frequency domain, optical frequency comb is a large bandwidth comb spectrum with good coherence performance and consists of many frequency components, so it can be used as a light source for dense wavelength division multiplexing (DWDM) system. In time domain, optical frequency comb is an ultra-short pulse sequence, which can be used as the light source of optical time division multiplexing (OTDM) system. With the development of laser technology and optical communication technology, optical frequency comb attracts more and more people's attention because of its wide application prospects. Photon analog signal processing can be realized by adjusting the amplitude and phase of the spectrum. Photon analog signal processing makes full use of the enormous bandwidth resources of photons and avoids it. In addition, silicon-based waveguides have attracted more and more attention in recent years because of their compact structure, integration and compatibility with traditional complementary metal oxide semiconductor (CMOS) processes. Circuit-based photonic analog signal processing also opens up the possibility of ultra-high speed and ultra-wideband signal processing. Future optoelectronic devices will also develop towards miniaturization and integration. The main research contents are as follows: (1) The characteristics and properties of optical frequency comb, its research background and significance are introduced in detail, and the research status of optical frequency comb is summarized. Several common schemes for generating optical frequency comb are summarized, and their advantages and disadvantages are analyzed briefly. In this paper, the significance of photon analog signal processing and the common methods of photon analog signal processing are introduced, and the progress of photon analog signal processing at home and abroad is summarized. (2) The application of high nonlinear optical fiber (HNLF) in optical frequency comb generation is studied experimentally. A cascaded four-wave mixing (CWM) scheme based on cascaded four-wave mixing (CWM) and a self-phase modulation (SPM) scheme using the self-phase modulation (SPM) effect in HNLF to generate optical frequency combs are proposed. The experimental results show that both cascaded four-wave mixing and self-phase modulation in HNLF can produce a wide bandwidth optical frequency comb with tunable center wavelength and frequency interval. More frequency lines should be generated, and the optical frequency comb can be flattened based on the self-phase modulation effect in HNLF. In addition, the ultra-short pulse output can be obtained based on the two nonlinear effects in time domain, and the pulse width can be tuned. (3) A scheme for generating optical frequency comb using cascaded time-domain lenses is proposed. Based on space-time duality and time-frequency duality, the concept of time-domain lens, imaging conditions in time-domain and Talbot effect in frequency-domain are introduced in detail. The experimental results show that the cascaded time-domain lens can generate optical frequency combs, and the number of spectral lines and frequency intervals can be flexibly tuned. (4) Using silicon-based photonic devices as spectra. The application of optical frequency comb in photonic analog signal processing is studied. First-order optical differentiator, first-order optical Hilbert transform, tunable fractional-order differentiator and simple optical arbitrary waveform generation are realized. Based on a single micro-disk resonator, both first-order optical differential and first-order optical waveform can be realized. The experimental results show that a single disk resonator can be used as an optical differentiator when the input signal has a large pulse width, and a single disk resonator can be used as an optical Hilbert converter when the input signal has a small pulse width. (2) A scheme of time domain stealth based on optical frequency comb and electrically tuned microring resonator is proposed for the first time. The optical frequency comb is combined with electrically tuned microring resonator to replace the function of time domain lens. The feasibility of time domain stealth is simulated and analyzed. Stealth in time domain.
【學(xué)位授予單位】：華中科技大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2016
【分類號】：TN911.7

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