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


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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    ABSTRACT: We review our recent progress on the realisation of pulse shaping in passively-mode-locked fibre lasers by inclusion of an amplitude and/or phase spectral filter into the laser cavity. We numerically show that depending on the amplitude transfer function of the in-cavity filter, various regimes of advanced waveform generation can be achieved, including ones featuring parabolic-, flat-top-and triangular-profiled pulses. An application of this approach using a flat-top spectral filter is shown to achieve the direct generation of high-quality sinc-shaped optical Nyquist pulses with a widely tunable bandwidth from the laser oscillator. We also present the operation of an ultrafast fibre laser in which conventional soliton, dispersion-managed soliton (stretched-pulse) and dissipative soliton mode-locking regimes can be selectively and reliably targeted by adaptively changing the dispersion profile and bandwidth programmed on an in-cavity programmable filter. The results demonstrate the strong potential of an in-cavity spectral pulse shaper for achieving a high degree of control over the dynamics and output of mode-locked fibre lasers.
    Preview · Article · Nov 2015 · Applied Sciences
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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: The rectangular spectrum of sinc-shaped Nyquist pulses enables the encoding of data in a minimum spectral width. Sinc pulses can improve optical sampling devices, could enable the implementation of ideal rectangular microwave photonics filters, and can be used for all-optical signal processing, spectroscopy, and light storage. Recently, the generation of sinc-pulse sequences with extraordinary quality was shown by the utilization of cascaded modulators. However, the line width and repetition rate of the pulses is limited by the modulator bandwidth. Here, we present the nonrestricted generation of flexible Nyquist pulse sequences. Therefore, multiple single lines of a comb generator are extracted with optical filters and subsequently processed by cascaded modulators. In a first proof-of-concept experiment, we achieved almost ideally sinc-shaped Nyquist pulses with a bandwidth of 286 GHz, a pulse width of 3.5 ps, and a duty cycle of 2.2%. However, sinc-shaped Nyquist pulse sequences in the femtosecond range with terahertz bandwidths would be possible with the method.
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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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