CAREER: Modules for Fiber Optic Communication Systems

光纤对于许多新兴的光学技术至关重要，包括通信系统、数据处理、视频传输和计算。 使用引导光子可实现的带宽和数据速率比使用电子或微波技术的可比系统大几个数量级。 光纤是廉价的低损耗波导，并且表现出可用于制造超快全光开关器件、脉冲光纤激光器、复用器和解复用器以及用于光纤通信系统的各种定时控制模块的非线性类型。 长距离和局域光纤通信网作为多千兆比特速率将不可避免地通过时域复用（TDM）和波分复用（WDM）技术的组合来实现。 TDM可用于减少频率信道的数量，从而允许WDM信道在载波频率放置和滤波器频率方面具有更宽的容限。 我们的目标是调查新的光纤模块，将超快时域技术与WDM功能。 我们提出了在孤子和零色散两种情况下构建100比特速率飞秒光纤激光器。 该方法是基于脉冲形成的非线性特性，包括频率选择和移位，以及TDM应用，如超高比特率解复用和数据检索。 我们建议使用的一种新技术已被证明产生相当大的脉冲缩短主动锁模激光器超出主动锁模理论预测的脉冲宽度。 该方法基于孤子或负色散区脉冲形成和传播的非线性特性，与以前基于快速光纤非线性概念设计的锁模激光器和开关器件相比，具有简单的优点。 初步工作将集中在开发新型光纤激光源，用于1.5p.m和1.3p.m的高比特率脉冲。 然后，激光器将被修改，以产生载波频率可调谐的脉冲序列的WDM应用。 我们将使用脉冲流来测试在类似机制上操作的频移模块。 接下来，将演示TDM解复用器和超快数据检索器。 最后，一个完整的系统原型实现，集成了光纤激光源，WDM和TDM设备将被证明。 该研究的成功完成将对光纤通信技术的研究和开发工作产生重大影响。 该研究计划解决了将WDM能力与高比特率孤子源和开关相结合的问题，对未来的高容量光通信网络具有毋庸置疑的价值。 两个特别重要的领域定位，以获得从我们的研究工作是长途通信系统和地面光纤环路网络。 结合我们提出的用于长距离通信的孤立子器件的开发，我们将应用相同的非线性锁模原理，在1.3 pm附近的零色散波长处使用掺Pr光纤放大器构建高比特率短脉冲 拟议的教学和教育计划将围绕以下目标展开：（1）开发新的光电工程课程，将从光纤研究的爆炸性最新进展中获得的新知识纳入本科和研究生课程，（2）增加本科生对当前研究工作的参与，为独立思考和对新发现的兴奋奠定基础，（3）促进妇女参与工程研究活动，特别鼓励中学和大学一年级的学生;（4）对研究生进行更广泛的实验技术培训，使其摆脱由特定论文研究课题决定的正常有限经验： 通过对论文和独立项目的监督，将在新的光纤实验室设施中为本科生提供研究机会。 将通过一项旨在向高中生和大学新生提供实验室经验的特别暑期方案，增加妇女对工程研究的参与。 学生将接触到科学研究环境，并获得工程研究职业生涯所需的第一手资料。 将包括导师支助，以跟踪个别女生在大学课程中的进展情况。 技术的日益复杂性需要进一步专业化的研究生谁愿意为该领域的进步作出贡献。 这种循环剥夺了研究生获得在当今快速变化的高科技经济中成功职业所需的重要广泛经验。 为了提高研究生的经验，更好地准备他们识别和解决未来的研究问题，研究“轮换”制度将实施。 ***

9502491 Bergman Optical fibers are essential to many emerging optical technologies, including communication systems, data processing, video transmission, and computing. The bandwidths and data rates achievable using guided photons are several orders of magnitude greater than comparable systems using electronic or microwave technologies. Fibers are inexpensive low-loss waveguides, and exhibit the type of nonlinearities which can be exploited in making ultrafast all-optical switching devices, pulsed fiber lasers, multiplexers and demultiplexers, as well as various timing control modules for fiber optic communication systems. Long-haul and local area fiber optic communication networks as multigigabit-rates will inevitably be done by a combination of time domain multiplexing (TDM) and wavelength (frequency) division multiplexing (WDM) techniques. TDM can be used to reduce the number of frequency channels allowing the WDM channels broader tolerances in carrier frequency placement and filter requisites. Our objective is to investigate novel fiber optic modules that incorporate ultrafast time domain techniques with WDM functions. We propose to build ultrahigh bit-rate femtosecond fiber lasers in both the soliton and zero dispersion regimes. The method is based on the nonlinear properties of pulse formation including frequency selection and shifting, as well as TDM applications such as ultra-high bit-rate demultiplexing and data retrieval. A new technique we propose to use has been shown to generate considerable pulse shortening in actively modelocked lasers beyond the predicted pulsewidths from active modelocking theory. The method is based on the nonlinear properties on pulse formation and propagation in the soliton or negative dispersion regime, and has the great advantage of simplicity over previous modelocked lasers and switching devices that were designed based on fast fiber nonlinearities concepts. The initial work will focus on developing novel fiber optic laser sources for hi gh bit-rate pulses at both 1.5p.m and 1.3p.m. The lasers will then be modified to produce carrier frequency tunable pulse trains for WDM applications. We will use the pulse streams to test a frequency shifting module operating on similar mechanisms. Next, a TDM demultliplexer and a ultrafast data retriever will be demonstated. Finally, a complete system prototype implementation that integrates the fiber laser source, WDM and TDM devices will be demonstrated. The successful completion of the proposed research will have significant impact on research and development efforts in fiber optic communication technology. This proposed research program addresses the issue of integrating WDM capabilities with high bit-rate soliton sources and switches, and will be unquestionable value to future high capacity optical communication networks. Two particularly important fields positioned to gain from our research efforts are long-haul communication systems and terrestrial fiber loop networks. In conjuction with our proposed development of soliton devices for long-haul communication, we will apply the same nonlinear modelocking principles to the construction of high bit-rate short pules with Pr-doped fiber amplifiers at the zero dispersion wavelength wavelength near 1.3p.m The teaching and educational plans proposed will enter about the following objectives: (1) develop a new optoelectronic engineering curriculum, incorporating into both, the undergraduate and graduate courses, new knowledge gained from the explosive recent advancements in fiber optics research, (2) increase involvement of undergraduate students in current research efforts to build a foundation for independent thinking and excitement for new discovery, (3) facilitate participation of women in engineering research activities, with particular encouragement for students at the secondary school and freshman year levels, and (4) train graduate students in broader experimental techniques that the normal confined experience dictated by a specific thesis research topic: Research opportunities for undergraduates will be provided in the n new fiber optic laboratory facilities through supervision of theses and independent projects. Increased participation of women in engineering research will be accomplished by a special summer program aimed at offering laboratory experience to senior high school and college freshman students. The students will be exposed to a scientific research environment and obtain a first hand view of what a career in engineering research entails. Mentor support will be included to follow progress of individual female students through their university curriculum. The increasing complexity of technology necessitates further specialization by graduate students who desire to contribute to the field's advancement . This loop deprives graduate students from gaining the important broad range of experiences that are required for successful careers in today's rapidly changing high tech economy. To enhance the graduate students experience and better prepare them to identify and solve future research problems, a research "rotation" system will be implemented. ***