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European Conference on Optical Communication

An Optical Flip-Flop Based on Erbium-Ytterbium Doped Fibre

Antonio Malacarne, Antonella Bogoni, Luca Potì

Published Sep 1, 2006• 8 citations
Publisher

Abstract

Erbium-Ytterbium doped fibre absorption and fluorescence are exploited to realize an optical bistable device. An all-optical flip-flop with 10 ns transition time, 18.48 nJ set and 19.82 nJ reset energies, is experimentally demonstrated.
DOI
10.1109/ecoc.2006.4801224

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Operating principle for a flip-flop memory cell based on erbium-doped devices is presented. A complete model for memory dynamics is introduced taking into account, at the same time, for memory writing, reading, and erasing. Simple equations are found relating writing, spontaneous and stimulated erasing times to device physical parameters, signals wavelength and power. In principle, for example, increasing writing and erasing energies at the appropriate wavelength it is possible to dramatically reduce transition times. Extinction ratio (ER) is also determined as a function of host medium, and signals properties. An optimization technique is proposed for erasing signal design in order to guarantee maximum ER. Numerical example are provided for Er and Er-Yb doped fibers whose doping ion density is rho = 1.1413middot1024ions/m3, and 2.0 middot1025ions/m3, respectively. Finally, an experimental demonstration giving an Er higher than 5 and 16 dB for the two fibers, respectively, is provided and discussed.
We have demonstrated for the first time an all-optical flip-flop based on optical bistability of an integrated SOA/DFB-SOA by applying an input signal with the period of 25.2 ns. An all-optical flip-flop based on optical bistability is expected to process the signal at an ultra-high speed in a light-wave communication. All-optical flip-flop has various applications such as all optical memory, demultiplexing, packet-header buffering, and retiming. Moreover, an integrated SOA/DFBSOA can perform all-optical logic operation and wavelength conversion by cross gain modulation.
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