Group delay and quadratic dispersion in optical microring resonator filters

微米级光子电路由波导、谐振器、半导体放大器、多路复用器等组成，是现代通信、仪器仪表和医学中使用的器件的基本组成部分。我的工作涉及这些电路的一个子集的开发，其主要组件是环形或圆盘谐振器，由单片表面波或埋入异质结构技术制造。与驻波（轴向模式）相比，支持反传播波的法布里-帕姆罗谐振器，微环和微盘是单向行波装置，只有在故意发射或由嵌入的不连续产生时，才会发生相反方向的同时传播。此属性使其在添加/删除过滤器和多路复用器应用中具有独特的功能。

Micrometer size photonic circuits composed of waveguides, resonators, semiconductor amplifiers, multiplexers, etc., is the fundamental constituent of the devices used in modern communication, instrumentation and medicine. My work relates to the exploitation of a subset of these circuits whose main component is the ring or disk resonator, fabricated by monolithic surface wave or by buried hetero-structure technology. In contrast to standing wave (axial mode) Fabry-Pérot resonators supporting counterpropagating waves, microrings and microdisks are unidirectional traveling wave devices, where simultaneous propagation in opposite directions occurs only if deliberately launched or created by an embedded discontinuity. This property gives rise to their unique features in add/drop filter and multiplexer applications.