Article

Quasi-Light-Storage based on time-frequency coherence

Deutsche Telekom Hochschule für Telekommunikation Leipzig, D-04277 Leipzig, Germany.
Optics Express (Impact Factor: 3.49). 09/2009; 17(18):15790-8. DOI: 10.1364/OE.17.015790
Source: PubMed

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.

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Available from: C.-A. Bunge, Aug 26, 2014
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    • "The rectangular spectrum of sinc-shaped Nyquist pulses enables bandwidth-efficient encoding of data, which is of key interest for high-capacity optical communication systems (see, e.g., [40] and the references therein). Besides optical communications, sinc pulses can bring benefits to many other fields, such as all-optical sampling [41], microwave photonics [42] and light storage [43]. Various techniques to optically generate Nyquist pulses have been demonstrated, including spectral reshaping of a mode-locked laser [44] or fibre optical parametric amplification [45]. "
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    • "Thus, optical sampling devices could be substantially improved [3]. Furthermore, sinc pulses could enable the implementation of ideal rectangular microwave photonics filters [4]–[6], they can be used for all-optical signal processing [7], spectroscopy [8] and light storage [9], [10]. These unique advantages lead to a strong research activity in the field of Nyquist pulse transmission and sinc pulse generation. "
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    ABSTRACT: 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.
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