Seminar by Dr Yong Yang 'Group delay and its dispersion in SNAP resonators'

Speaker:
Dr Yong Yang, Senior Research Fellow, Aston Institute of Photonic Technologies (AIPT), Aston University, UK

Title:
Group delay and its dispersion in SNAP resonators

Abstract:
In photonics devices for telecommunications, group delay and its group velocity dispersion are very important parameters as they limit the light pulses transporting in the devices. In SNAP resonators developed in our lab, light can propagate along the axial direction of the resonator. The propagation constant can be calculated by solving the scattering problem of a 1D Schrodinger equation. Thus the axial propagation can be managed by generating different lateral profiles. In this talk, we will discuss the equivalence of the axial propagation to the tunnelling process in a potential barrier and further the influence of the axial mode to the total dispersion of the resonator. I will explain how to measure the group delay experimentally in a uniform cylindrical resonator near the so-called cut-off frequency. In the more recent research, we also measured the transmission spectrum of the SNAP resonator with the same experimental platform and observed the resonant tunnelling. And lastly, I will report my latest understanding of the group velocity dispersion management using the axial modes of the SNAP resonators, how it is related to the quantum many body problem. Relevant experiment progress will also be mentioned. I wish my talk can shed some light on the future development of delay line, dispersion compensation and comb generations.