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Advanced Photonics & Renewable Energy

100 ns Quasi-Light-Storage of 8 Bit Data Sequences at 1Gbps

Kambiz Jamshidi, Stefan Preußler, Andrzej Wiatrek, Ronny Henker, J. Klinger, Thomas Schneider

Published Jan 1, 2010• 0 citations
Publisher

Abstract

We propose a new approach for the storage of 8bit optical data bursts based on quasi-light-storage method. We achieved storage time of 100ns using conventional telecommunication components with the ability of fine and coarse tuning.
DOI
10.1364/np.2010.nme21

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We show a method for distortion-free quasi storage of light which is based on the coherence between the spectrum and the time representation of pulse sequences. The whole system can be considered as a black box that stores the light until it will be extracted. In the experiment we delayed several 5 bit patterns with bit durations of 500ps up to 38ns. The delay can be tuned in fine and coarse range. The method works in the entire transparency range of optical fibers and only uses standard components of optical telecommunications. Hence, it can easily be integrated into existing systems.
Today's telecommunication is based on optical packets which transmit the information in optical fiber networks around the world. Currently, the processing of the signals is done in the electrical domain. Direct storage in the optical domain would avoid the transfer of the packets to the electrical and back to the optical domain in every network node and, therefore, increase the speed and possibly reduce the energy consumption of telecommunications. However, light consists of photons which propagate with the speed of light in vacuum. Thus, the storage of light is a big challenge. There exist some methods to slow down the speed of the light, or to store it in excitations of a medium. However, these methods cannot be used for the storage of optical data packets used in telecommunications networks. Here we show how the time-frequency-coherence, which holds for every signal and therefore for optical packets as well, can be exploited to build an optical memory. We will review the background and show in detail and through examples, how a frequency comb can be used for the copying of an optical packet which enters the memory. One of these time domain copies is then extracted from the memory by a time domain switch. We will show this method for intensity as well as for phase modulated signals.