Distortion free pulse delay system using a pair of tunable white light cavities

TL;DR

This paper proposes a theoretically designed distortion-free pulse delay system using two tunable white light cavities, enabling large delays with minimal pulse distortion and surpassing traditional delay-bandwidth limits.

Contribution

It introduces a novel delay system employing two tunable white light cavities that can trap and release data pulses without distortion, exceeding conventional delay-bandwidth constraints.

Findings

System can achieve large delays with negligible pulse distortion

Numerical simulations confirm performance surpassing traditional buffers

Pulse remains virtually undistorted during delay process

Abstract

Recently, a tunable bandwidth white light cavity (WLC) was demonstrated by using an anomalously dispersive intra-cavity medium to adjust a cavity linewidth without reducing the cavity buildup factor [G.S. Pati et al., Phys. Rev. Lett. 99, 133601 (2007)]. In this paper, we show theoretically how such a WLC can be used to realize a distortion-free delay system for a data pulse. The system consists of two WLCs placed in series. Once the pulse has passed through them, the fast-light media in both WLCs are deactivated, so that each of these now acts as a very high reflectivity mirror. The data pulse bounces around between these mirrors, undergoing negligible attenuation per pass. The trapped pulse can be released by activating the fast-light medium in either WLC. Numerical simulations show that such a system can far exceed the delay-bandwidth constraint encountered in a typical data buffer employing slow light. We also show that the pulse remains virtually undistorted during the process.