Conference Paper

Direct observation of the coherent spectral hole in the noise spectrum of a saturated InAs/InP quantum dash amplifier operating near 1550 nm

Electrical Engineering Dept., Technion, Haifa 32000, Israel
DOI: 10.1364/OE.16.002141 Conference: Optical Communication (ECOC), 2007 33rd European Conference and Ehxibition of
Source: IEEE Xplore

ABSTRACT We demonstrate a direct observation of the coherent noise spectral hole in a saturated quantum dash amplifier. Its width 500-600 GHz is determined by the response time and is responsible for high speed regeneration properties.

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Available from: Vissarion (Beso) Mikhelashvili, Aug 19, 2014
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    • "For devices like highly nonlinear quantum dash SOAs with a decreased -factor, the ER improvement might also be observable, since the fast nonlinear intraband effects are more pronounced than in bulk devices. First investigations of these devices have shown similar Bogatov-like effects [17]. "
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    ABSTRACT: Theoretical results on the extinction ratio (ER) improvement in ultralong semiconductor optical amplifiers (UL-SOAs) are presented indicating a Bogatov-like effect in the saturated section. Starting from general nonlinear gain equations, an analytic description of the Bogatov-like effect is derived in terms of gain coefficients. These equations are used to explain the results of fully numerical simulations. The data signal's ER improves because of a two-step process. First, the data signal cross-gain modulates the additionally injected CW signal. Second, due to this inverse modulation, the data signal's states are differently amplified via the Bogatov-like effect. Since the ER improvement is caused by the fast intraband effects, this simple scheme has the potential for high-speed regeneration.
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    ABSTRACT: We demonstrate multi wavelength processing in a broad band 1550 nm quantum dash optical amplifier. Two 10 Gbit/s signals, spectrally separated by 30 nm are individually wavelength converted via four wave mixing (FWM) with no cross talk. High power signal levels cause depletion of high energy and wetting layer states resulting in some homogenizing of the gain medium and generation of cross FWM components near each channel due to FWM in the other channel. These do not affect the cross-talkless multichannel processing except when the two channels use equal detuning between signal and pump.
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    ABSTRACT: We developed an improved model in order to predict the RF behavior of the SOA valid for any experimental conditions. It takes into account the dynamic saturation of the SOA, which can be fully characterized by a simple measurement, and only relies on material fitting parameters, independent of the optical intensity and bias current. We used this new model to analyze and model the additive noise of the SOA in order to fully characterize the influence of the slow light effect on the microwave photonics link properties. To cite this article: P. Berger et al., C R. Physique 10 (2009). (C) 2009 Academie des sciences. Published by Elsevier Masson SAS. All rights reserved.
    Comptes Rendus Physique 12/2009; 10(10):991-999. DOI:10.1016/j.crhy.2009.10.005 · 2.04 Impact Factor
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