Efficient Fiber Optical Parametric Amplifiers for ...

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GRØN DYST 2012 Technical University of Denmark

Efficient Fiber Optical Parametric Amplifiers for Amplification in Optical Communication Systems
Author:E. Christensen (DTU Fotonik, Technical University of Denmark, Denmark)
M. Christensen (DTU Fotonik, Technical University of Denmark, Denmark)
J. H. Nielsen (DTU Fotonik, Technical University of Denmark, Denmark)
R. L. Pedersen (DTU Fotonik, Technical University of Denmark, Denmark)
L. Mejling (DTU Fotonik, Technical University of Denmark, Denmark)
Date: 2012-06-22     Track: Main     Session: 1

INTRODUCTION Within our modern society we are all continuously requesting more and more capacity in communication systems. This is for example due to increased internet traffic caused by an increasing number of consumers of the internet in developing countries but also due to more services that are becoming available. Consequently, research within components for future communications systems have, until this point in time, focused on components that secure the possibility of supporting the request for a continued increases in needed capacity. An important, optical component is the optical amplifier, and research within the last decade has focused on optical amplifiers that support increased capacity for example Raman amplifiers and fiber optical parametric amplifiers (FOPAs) that may provide gain at a broader range of wavelengths compared to conventional optical amplifiers based on rare-earthdoped fiber materials, and in addition offer an improved noise performance. These improved properties are achieved by neglecting the energy efficiency of the amplifiers. In simple designs only optimized for capacity, the conventional rare-earth-doped fiber amplifiers provide a gain of a few tens of dB for tens of milliwatts of pump power where a Raman amplifier requires watts of pump power to supply a similar gain. One reason for this is that only a fraction of the pump power is used because for low pump power the noise performance in general is degraded, unless novel amplifier configurations are developed. In the future there is an obvious need not only to be concerned about the capacity but also to address the energy efficiency of optical fiber amplifiers. This includes the amplifier configuration as well as the fiber used. OUR PROJECT In this work we focus on the amplifier configuration. We evaluate the quantum efficiency and discuss how close different amplifier configurations are to this limit. We evaluate and discuss the benefit of using a so-called fiber optic parametric amplifier (FOPA). We consider various proposals for fibers and the amplifier and use numerical calculations to try and optimize the amplifier such that it requires less energy for the same amplification. LCA Materials Production Use Disposal.