3 years ago

Eigenmode and frequency domain analysis of the third-order microring filters

M. Radmilović-Radjenović, B. Radjenović

Abstract

In this paper we compare results of the eigenmode analysis of the third-order add/drop filter with the transfer functions (S-parameters) calculated in wide spectral range covering telecommunication C band. Both type of calculations are performed using 2D finite elements (FEM) method. The computational domain is closed using standard perfectly matched layer method. Also, the model of add/drop microring filter based on the temporal coupled mode is presented, since such models are usually used as a starting point in filter design procedure. The obtained results show excellent agreement between the two approaches. It is well known that when single microring is coupled to access waveguides or another rings, the resonance frequency will deviate from its original isolated resonator value. This effect, known as coupling-induced resonance frequency shift, causes resonance frequency mismatches between individual resonators and thus significantly impacts eigen spectra, as well as transfer characteristics, of the coupled-resonator systems. FEM calculations show that this effect has no significant importance when coupling between the access waveguide and the microring is strong enough, i.e. when the conditions for flat filter response are satisfied.

Publisher URL: https://link.springer.com/article/10.1007/s11082-018-1502-4

DOI: 10.1007/s11082-018-1502-4

You might also like
Never Miss Important Research

Researcher is an app designed by academics, for academics. Create a personalised feed in two minutes.
Choose from over 15,000 academics journals covering ten research areas then let Researcher deliver you papers tailored to your interests each day.

  • Download from Google Play
  • Download from App Store
  • Download from AppInChina

Researcher displays publicly available abstracts and doesn’t host any full article content. If the content is open access, we will direct clicks from the abstracts to the publisher website and display the PDF copy on our platform. Clicks to view the full text will be directed to the publisher website, where only users with subscriptions or access through their institution are able to view the full article.