Abstract
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.
Highlights
A fiber optic-based all-optical amplifier is designed by using the coherent perfect absorption phenomenon
We propose a fiber optic coherent all-optical amplifier that its operation is upon coherent perfect absorption (CPA)[39,40,41]
We manage the portion of pump beam which is absorbed within an absorbent material by using the CPA and interference with the gate signal
Summary
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. Among several methods to design all-optical transistors, a group of transistors operates on the basis of coherent properties of light, relative phase and interference[10,11,27,28,29,30] In this type of transistors, the signal to be amplified (gate), along with the pump beam, which provides the required energy for the amplification process, is supplied from a single coherent optical source[31,32]. We introduce the designed structure and compare the theoretical and experimental results for the constructed device
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