Design of high speed optical transmission systems

高速光传输系统设计

• 批准号: 288306-2006
• 负责人: Kumar, Shiva
• 金额: $ 1.88万
• 依托单位: McMaster University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2006
• 资助国家: 加拿大
• 起止时间: 2006-01-01 至 2007-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=338945
• 关键词: Design; speed; optical; transmission; systems

The objective of the proposed research is to study the transmission impairments in fiber optic systems and design new components and systems that enhance the quality of transmission. In this research program, we propose to develop new system designs and multiplexing schemes that provide the best  transmission performance. We also develop analytical expressions for the error probability of systems based on differential phase shift keying (DPSK) in different propagation regimes. These analytic expressions are important because the calculation of error probability of a nonlinear fiber-optic system by numerical simulations is a formidable task.  In this research program, we will develop novel time division multiplexing(TDM) schemes based on soliton interaction to reduce the time-bandwidth product of a signal. Such a scheme increases the spectral efficiency and hence, it would enable to transmit more data in a channel with limited bandwidth. For cable TV applications, it is desirable to design optical fibers that can carry large powers without back-reflection due to stimulated Brillouin scattering (SBS). Large optical power launched into the optical fiber causes lattice vibrations resulting in acoustic waves. The acoustic waves reflect the incident optical signal due to acousto-optic interaction. In the proposed research program, simulation tools to model acoustic propagation and acousto-optic interaction in fibers will be developed. With the help of these tools, we explore  new optical fiber designs that suppress back-reflections. We also develop new techniques to suppress the back-reflection due to SBS using isolators and dissimilar fiber geometries. The system designs investigated during the research programs are benefecial to Canada because several Canadian industries are interested in these designs in which it is possible to launch high optical powers to their system/device.

本研究的目的是研究光纤系统中的传输损伤，并设计新的组件和系统来提高传输质​​量。在本研究计划中，我们建议开发新的系统设计和复用方案，以提供最佳的传输性能。我们还开发了不同传播机制中基于差分相移键控（DPSK）的系统的错误概率的解析表达式。这些解析表达式很重要，因为通过数值模拟计算非线性光纤系统的误差概率是一项艰巨的任务。  在本研究计划中，我们将开发基于孤子相互作用的新型时分复用（TDM）方案，以减少信号的时间带宽积。这种方案提高了频谱效率，因此能够在带宽有限的信道中传输更多数据。对于有线电视应用，需要设计能够承载大功率且不会因受激布里渊散射 (SBS) 导致背反射的光纤。发射到光纤中的大光功率会引起晶格振动，从而产生声波。由于声光相互作用，声波反射入射光信号。在拟议的研究计划中，将开发模拟光纤中声传播和声光相互作用的模拟工具。在这些工具的帮助下，我们探索了抑制背向反射的新光纤设计。我们还开发了新技术，使用隔离器和不同的光纤几何形状来抑制 SBS 造成的背向反射。研究计划期间调查的系统设计对加拿大有利，因为加拿大的一些行业对这些可以向其系统/设备发射高光功率的设计感兴趣。