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Conference on Lasers and Electro-Optics

Observation of Coherent Perfect Absorption in a Short-Length Weakly Absorbing Fiber

Ali K. Jahromi, Ayman F. Abouraddy

Published Jan 1, 2017• 0 citations
Publisher

Abstract

We predict and experimentally confirm that a moderately-doped few-centimeter-long fiber can completely absorb an incoming beam, if the fiber is placed in a properly-designed cavity that satisfies the requirements for coherent perfect absorption.
DOI
10.1364/cleo_at.2017.jtu5a.52

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A fiber optic-based all-optical amplifier is designed by using the coherent perfect absorption phenomenon. For this purpose, we use a deposited chromium thin layer as an absorbent material on the cross-section of a PM fiber. By placing another fiber in front of the deposited one, we show that by controlling the relative phase between the two counter-propagating beams, total absorbance can be controlled. In the interaction of two beams with unequal intensities, absorption control can be associated with amplification for the weaker beam. By using this mechanism, the effect of an external phase-shifting parameter can be amplified. Furthermore, it is possible to amplify a small signal riding on a CW background through this all-optical procedure.
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We investigate coherent perfect absorption (CPA) of squeezed coherent states of light by an absorbing beam splitter. First we derive the absorption coefficients for quantum coherence and for intensity, which generally differ. Secondly, we present the remarkable properties of a CPA-gate: two identical but otherwise arbitrary incoming squeezed coherent states can be completely stripped off their coherence, producing a pure entangled squeezed vacuum state at the output. Importantly, this output state of light is not entangled with the absorbing beam splitter by which it was produced. This makes the CPA gate potentially interesting for continuous-variable quantum state preparation.