Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Optics Express

Quasi-Light-Storage based on time-frequency coherence

Stefan Preußler, Kambiz Jamshidi, Andrzej Wiatrek, Ronny Henker, Christian‐Alexander Bunge, Thomas Schneider

Published Aug 21, 2009• 54 citations
Publisher

Abstract

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.

DOI
10.1364/oe.17.015790

Related papers

A proposal for a tunable light storage method based on Quasi-Light-Storage and frequency-to-time-conversion

Kambiz Jamshidi, Christian‐Alexander Bunge, Thomas Schneider

We propose a quasi-light-storage method which is based on frequency-to-time conversion and capable of being integrated with a delay-bitrate product of 50 bits. The delay can be tuned in fine and coarse range easily.

Integrated Photonics Research, Silicon and Nanophotonics and Photonics in Switching•Jan 1, 2010•1 citation

Increasing the storage time of Quasi-light storage by reducing the Brillouin gain bandwidth in a feedback system

Stefan Preußler, Thomas Schneider

The core elements of optical packet-switched networks rely on optical routers. A key technology for the realization of such components is the variable delay and storage of optical data packets. Optical Memories are used for tasks, such as packet buffering for collision avoidance and synchronization, as well as processing of headers in optical routers. The quasi-light storage (QLS) is a method for the variable and almost distortion free optical data storage, which can be realized within the entire transparency range of optical fibers with standard telecommunication components. QLS is based on the time-frequency-coherence and utilizes stimulated Brillouin scattering (SBS) for filtering the spectrum of the data signal. Due to the natural bandwidth of the SBS, the maximum storage time of the QLS is limited to 100 ns. By reducing the bandwidth, the storage time can be significantly increased. There exist some approaches for reducing the SBS bandwidth. Firstly, the Brillouin gain can be superimposed with two losses and secondly, an aperture in the frequency range can be used. Both methods achieve a SBS bandwidth of about 3 MHz, but have some disadvantages when applied to the QLS. For the superposition method, the overall gain is too low, and for the other method the aperture cannot be separated from the signal. In this paper we show the reduction of the Brillouin gain bandwidth through a feedback system. The sampled signal passes several times through the system, so that the Brillouin gain bandwidth is reduced. This leads to a drastic increase of the QLS storage time. In a first experiment with single pulses, a maximum storage time of 600 ns was achieved, which corresponds to a sixfold increase compared to a normal system QLS.

•May 6, 2013•1 citation

Quasi-light Storage for Optical Data Packets

Thomas Schneider, Stefan Preußler

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.

Journal of Visualized Experiments•Feb 6, 2014•1 citation

Quasi-Light Storage: A Method for the Tunable Storage of Optical Packets With a Potential Delay-Bandwidth Product of Several Thousand Bits

Thomas Schneider, Kambiz Jamshidi, Stefan Preußler

We investigate and discuss the possibilities and limits of a method for the tunable storage of optical packets called Quasi-Light Storage (QLS). The QLS is simply based on a sampling in the frequency domain. Hence, it is independent of the data rate, the modulation and the wavelength of the optical packets. It works at room temperatures in standard fibers with off-the-shelf telecom equipment. As we will show in theory, the method has the potential to store packets with several thousand Bits of data from Zero to up to 100 ns. In the experiments we have stored several 8 Bit packets with a data rate of 1 Gbps for up to 100 ns, which corresponds to a delay-bandwidth product of 100 Bit.

Journal of Lightwave Technology•Jul 19, 2010•31 citations

Quasi-light Storage for Optical Data Packets

Thomas Schneider, Stefan Preußler

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.

Journal of Visualized Experiments•Feb 6, 2014•1 citation

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

Kambiz Jamshidi, Stefan Preußler, Andrzej Wiatrek +3 more

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.

Advanced Photonics & Renewable Energy•Jan 1, 2010•0 citations
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.
The core elements of optical packet-switched networks rely on optical routers. A key technology for the realization of such components is the variable delay and storage of optical data packets. Optical Memories are used for tasks, such as packet buffering for collision avoidance and synchronization, as well as processing of headers in optical routers. The quasi-light storage (QLS) is a method for the variable and almost distortion free optical data storage, which can be realized within the entire transparency range of optical fibers with standard telecommunication components. QLS is based on the time-frequency-coherence and utilizes stimulated Brillouin scattering (SBS) for filtering the spectrum of the data signal. Due to the natural bandwidth of the SBS, the maximum storage time of the QLS is limited to 100 ns. By reducing the bandwidth, the storage time can be significantly increased. There exist some approaches for reducing the SBS bandwidth. Firstly, the Brillouin gain can be superimposed with two losses and secondly, an aperture in the frequency range can be used. Both methods achieve a SBS bandwidth of about 3 MHz, but have some disadvantages when applied to the QLS. For the superposition method, the overall gain is too low, and for the other method the aperture cannot be separated from the signal. In this paper we show the reduction of the Brillouin gain bandwidth through a feedback system. The sampled signal passes several times through the system, so that the Brillouin gain bandwidth is reduced. This leads to a drastic increase of the QLS storage time. In a first experiment with single pulses, a maximum storage time of 600 ns was achieved, which corresponds to a sixfold increase compared to a normal system QLS.
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.
We investigate and discuss the possibilities and limits of a method for the tunable storage of optical packets called Quasi-Light Storage (QLS). The QLS is simply based on a sampling in the frequency domain. Hence, it is independent of the data rate, the modulation and the wavelength of the optical packets. It works at room temperatures in standard fibers with off-the-shelf telecom equipment. As we will show in theory, the method has the potential to store packets with several thousand Bits of data from Zero to up to 100 ns. In the experiments we have stored several 8 Bit packets with a data rate of 1 Gbps for up to 100 ns, which corresponds to a delay-bandwidth product of 100 Bit.
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.