Linear Pulse Compansion using Co-propagating Space-Time Modulation

TL;DR

This paper introduces a novel linear pulse compansion method using co-propagating space-time modulation, enabling distortion-free, high-ratio pulse compression or expansion with potential for simultaneous multi-pulse processing.

Contribution

The paper proposes a new pulse compansion technique based on engineered asymmetric space-time media that co-propagate with pulses, allowing unlimited compansion ratios and linear pulse shaping without distortion.

Findings

No theoretical limit on compansion factor

Can transform pulse shape and modulation linearly

Suitable for simultaneous multi-pulse processing

Abstract

This paper presents a pulse compansion, i.e. compression or expansion, technique based on co-propagating space-time modulation. An engineered asymmetric space-time modulated medium, co-propagating with a pulse compands the pulse continuously and at a constant rate. The space-time medium locally modifies the velocity of different sections of the pulse in order to shape the pulse as it propagates. There is no theoretical limit on the compansion factor with the proposed system. Moreover, it can be designed to transform the pulse shape and its modulation linearly, without any distortion. Therefore the proposed technique can be used for up or down-conversion of modulated pulses, with extreme conversion ratios. The presented compansion technique is linear with respect to the input wave and therefore can be used to perform compansion or frequency conversion on multiple pulses simultaneously.