【作者】 杜荣建；

【导师】 向望华；

【作者基本信息】 天津大学 ， 物理电子学， 2003， 博士

【摘要】 近十年来，多媒体交互式业务、因特网业务和宽带综合业务数字通信网络迅猛发展，对数据信号传输速率和传输带宽提出了更高的要求，通信容量几乎成指数增长。以超高速光时分复用(OTDM)技术和密集波分复用(DWDM)技术为核心的全光通信网络，已成为国际上通信领域研究的热点，特别是超高速OTDM技术是实现超大容量（Tbit/s）通信传输速率的首选方案。本论文的研究工作，主要是围绕超高速OTDM通信系统的关键技术来开展的，在理论方面:较为全面的分析和总结了超高速OTDM通信系统的关键技术；对锁模半导体激光器的基础理论进行研究，并对其瞬态特性和阈值电流特性进行了数值模拟，建立了合理的锁模半导体激光器模型，为后续的实验工作提供了必要的理论指导；对多量子阱外腔混合锁模半导体激光器的噪声特性和啁啾特性进行了理论研究，通过数值计算和仿真分析，对实验中10GHz混合锁模半导体激光器进行了优化设计；对达到变换极限、高重复频率、多量子阱、外腔型、混合锁模半导体激光器（10GHz）的基础理论，进行了相关研究。在实验方面，课题组制作并调试了一套多量子阱外腔混合锁模半导体激光器的实验装置，能够实现具有脉宽窄（2.9ps）、频率啁啾小（ΔtΔυ～0.43）、时间抖动性小（<0.6ps）、较小的饱和吸收能量（<1pJ）、超快的恢复时间（8ps）、高重复频率（10GHz）、可精确控制波长（1.55μm）、波长调谐范围大（35nm）、结构简单、集成度高、稳定性好、易于长期工作的超高速超短脉冲通信光源，取得了良好的实验效果；对10GHz超高速光时分复用系统通信光源的实验研究，主要包括10GHz通信光源的自发辐射光谱特性、荧光光谱的蓝移现象、连续激光功率与增益电流的关系、锁模脉冲光谱特性、高重复频率锁模脉冲波形、锁模脉冲宽度、锁模光脉冲的RF谱和锁模脉冲光功率的理论计算等方面；利用多量子阱混合锁模半导体激光器（10GHz）的实验装置，进行了超高速40GHz光时分复用OTDM通信技术的实验研究，实现了仅利用一个波长为1.55μm的超高速10Gb/s光脉冲信号源，就能够产生重复频率为40GHz、脉宽为3ps的超高速、超短脉冲光源，即40Gb/s超高速光时分复用信号产生系统，是超高速光纤时分复用OTDM通信系统中的理想光源。 <WP=4>本论文的创新之处：1 在国内首次对多量子阱外腔混合锁模半导体激光器的噪声特性和啁啾特性进行了理论研究，通过数值模拟计算和仿真分析，对实验中混合锁模半导体激光器（10GHz）进行了优化设计；2 在国内首次制作并调试了一套多量子阱外腔混合锁模半导体激光器（10GHz）的实验装置，成功实现了接近带宽变换极限（～0.43）、高重复频率（10GHz）、窄脉宽（2.9ps）的超高速、超短脉冲通信光源，取得了良好的实验效果；3 在国内首次利用多量子阱混合锁模半导体激光器（10GHz）的实验装置，开展了超高速光时分复用OTDM技术（40GHz）的实验研究，获得了40Gbit/s的超高速、超短脉冲信号光源。更多还原

【Abstract】 With the rapid advances of the commutative multi-media services, the internet services and the broad-band integrated-services-digital-networks (ISDN) in the last ten years, it becomes evident that the communication capability is being increased at exponential speed, so the higher demands are put forward for the transmission velocity and the transmission band-width now. It has become a hotspot in the field of telecommunication research throughout the world, which is the all-optical network communication associated the ultra-high-speed optical-time-division-multiplexing (OTDM) technology with the dense-wave-division-multiplexing (DWDM) technology, in particular, the ultra-high-speed OTDM technology is the first choice for the ultra-high-speed and ultra-large-capability communications system (Tbit/s). The paper is mainly involved in the ultra-high-speed OTDM key technologies, a series of theoretical researches have been done on the ultra-high-speed OTDM communications system in this dissertation. The main contents of the work are as follows: Firstly, the key technologies of the ultra-high-speed OTDM communications system is reviewed, summarized and described at length. Secondly, the basic principles of the mode-locked laser diodes (MLLDs) are described in detail. The momentary characteristics and the threshold-current characteristics of the multi- quantum-well (MQW) external-cavity hybrid MLLDs are given respectively, and the numerical calculations are performed inside country. Moreover, the experimental mode of the MLLDs is optimized at best, and the reasonable theories of MLLDs are provided for the last experimentation. Thirdly, the noise characteristics and the chirp characteristics of the MQW external-cavity hybrid MLLDs (10GHz) are firstly presented at home. By the numerical calculations, the 10GHz MQW hybrid MLLDs are optimized and discussed in test. Finally,the experimental theories of nearly transform-limited pulse, higher repeating rate (10GHz), multi-quantum wells, external -cavity modulation and hybrid mode-locked MLLDs are provided and discussed seriously in the round.In the experimental aspects, first of all, a set of experimental setup based on the MQW external-cavity hybrid MLLDs (10GHz) is firstly put up and tested at home, so we have had a better experimental result in the field at present. Our research team have achieved the ultra-short communication pulse with lesser pulse-width(2.9ps), lesser chirping (～0.43),lesser time jittery (<0.6ps),lesser saturated energy (<1pJ), ultra-high-speed recovery time (8ps), higher repeating rate (10GHz), accurately controlled wavelength (1.5μm), bigger wavelength tuning spectrum scope (35nm), simple structure, higher integration, better stability and long-time working characteristics so on. Secondly, with regard to the MQW external-cavity hybrid MLLDs combined the transform-limited pulse (0.43) with higher repeating rate (10GHz), we have succeeded in fulfilling it in use of our self-made experimental setup. The experimental results are mainly composed of the spontaneous radiation spectrum, wavelength blue-shifted phenomenon, the relations between continuous laser optical power and gain current, mode-locked laser pulse spectrum, higher <WP=6>repeating frequency mode-locked pulse shape, mode-locked pulse-width, RF spectrum of mode-locked pulse, and the calculation of the mode-locked pulse optical power so on. Thirdly, through the MQW hybrid MLLDs (10GHz), the ultra- high-speed OTDM communications system with higher repeating rate (40GHz) is firstly studied inside country. We have realized a set of 40Gb/s ultra-high-speed OTDM communications system only by one 10Gb/s ultra-high-speed MLLDs based on wavelength 1.55μm, which can provide the ultra-short pulse of higher repeating rate (40GHz) and lesser pulse-width (3ps). In our opinions, the experimental results are well in agreement with the anticipatively related principles. All in all, the 40Gb/s ultra-high-speed system is an ideal pulse-generator of the future ultra-high-speed OTDM communications system.The更多还原