光学延迟线在微波光子学（如光控雷达中的微波相位延迟）和高速光学信号处理（如数据同步、 光学存储、 模式识别）领域有极大的应用价值。为解决光学延迟线领域的瓶颈问题，如：“带宽-延时局限”、色散、可调谐性等，利用准柱形腔独特的模式场分布与稳定的光耦合特性，研制一种小型动态可调谐光学群延迟系统。采用准柱形腔-锥形光纤耦合系统作为关键部件，结合压电效应、克尔非线性效应、热光效应等调谐手段有效实现一种近零色散、大延迟量、低损耗、可调谐，并且能够动态开关的小型群延迟线系统。. 基于波动理论和量子力学理论建立准柱形腔模场分布及延迟特性理论模型。搭建群延迟线加工、检测、调谐及动态开关系统，探索压电效应、克尔非线性效应、热光效应、电光效应等调谐手段对延迟量的影响，实现一种可调谐和动态可控的光学群延迟线。形成一套较完整的基于准柱形腔光学群延迟线的理论分析、结构设计、加工，动态控制、延迟测量的理论

Optical delay lines have attracted great interest in applied fields such as microwave photonics (microwave phase delay in optically controlled radar) and high speed optical signal processing (data synchronization, optical buffering, mode characterization). To solve the bottlenecks in the field of optical delay line such as “bandwidth-delay limitation”, dispersion, and tunability, we develop a miniature dynamic tunable optical group delay line system using the unique characteristics in mode field distributions and stable coupling feature of quasi-cylindrical resonator. The system employs the resonator-taper coupling system as a key element and combines some tunable methods, i.e., piezo-electric effect, nonlinear optical Kerr effect, and thermal-optic effect, to realize a zero-dispersion, large delay, low loss, minimal effective speed of light, and dynamic tunable miniature group delay line system. . This project constructs the mode field distributions and the delay features of a quasi-cylindrical resonator based on wave optics and quantum mechanics. Also, we propose to construct a group delay line system involving its fabrication, detection, tuning, and dynamic switching, studies the effect of tenability on group delay, and achieves a tunable and dynamic optical group delay lines. Finally, we establish a theoretical system and experimental methodology based on the theoretical model, system construction, fabrication, dynamic control, and delay measurement of optical group delay lines in a quasi-cylindrical resonator.