Fabry -Perot filters with Tunable Josephson Junction Defects

TL;DR

This paper introduces a tunable Fabry-Perot filter using long Josephson junctions, capable of operating in the 100-500 GHz range with adjustable resonance frequency controlled by a dc bias.

Contribution

It demonstrates a novel approach to tuning high-frequency filters via Josephson junction impedance modulation, combining linear analysis and nonlinear simulations.

Findings

Achieves up to 10% frequency tuning of the resonance

Operates effectively in the 100-500 GHz range

Bandwidth below 1 GHz

Abstract

We propose to take advantage of the properties of long Josephson junctions to realize a frequency variable Fabry-Perot Filter that operates in the range 100-500 GHz with a bandwidth below 1 GHz. In fact, we show that it is possible to exploit the tunability of the effective impedance of the Josephson component, that is controlled by a dc bias, to tune, up to $10\%$ of the central frequency, the resonance of the system. An analysis of the linearized system indicates the range of operation and the main characteristic parameters Numerical simulations of the full nonlinear Josephson element confirm the behavior expected from the linear approximation.