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Quantum Electronics, IEEE Journal of

Issue 9 • Date Sept. 2014

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Displaying Results 1 - 15 of 15
  • Front cover

    Page(s): C1
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  • IEEE Journal of Quantum Electronics publication information

    Page(s): C2
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  • Table of contents

    Page(s): 721 - 722
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  • Enhanced Dynamic Performance of Quantum Dot Semiconductor Lasers Operating on the Excited State

    Page(s): 723 - 731
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1678 KB) |  | HTML iconHTML  

    The modulation dynamics and the linewidth enhancement factor of excited-state (ES) lasing quantum dot (QD) semiconductor lasers are investigated through a set of improved rate equation model, in which the contribution of off-resonant states to the refractive index change is taken into account. The ES laser exhibits a broader modulation response associated with a much lower chirp-to-power ratio in comparison with the ground-state (GS) lasing laser. In addition, it is found that the laser emission in ES reduces the linewidth enhancement factor of QD lasers by about 40% than that in GS. These properties make the ES lasing devices, especially InAs/InP ones emitting at 1.55 μm, more attractive for direct modulation in high-speed optical communication systems. View full abstract»

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  • Numerical Analysis of Mode Discrimination by Intracavity Patterning in Long-Wavelength Wafer-Fused Vertical-Cavity Surface-Emitting Lasers

    Page(s): 732 - 740
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2041 KB) |  | HTML iconHTML  

    This paper presents an extensive numerical analysis of 1.3-μm wavelength wafer-fused vertical-cavity surface-emitting lasers (VCSELs) incorporating intracavity patterning. Using a 3-D, self-consistent model of the physical phenomena in VCSELs, supported by experimental results used for parameter calibration, we investigate the influence of arch-and ring-shaped intracavity features with a broad range of geometrical parameters on the modal behavior of the VCSEL. To design and optimize the devices, we used intracavity patterning that provides very strong discrimination of higher order modes, pushing them out from the active region. This mechanism makes possible single mode operation under a broad range of currents and could potentially enhance the single-mode output power of these devices. View full abstract»

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  • Light Emitting Devices Based on CdSe Nanoparticles Capped With Mercaptoacetic Acid

    Page(s): 741 - 748
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2703 KB) |  | HTML iconHTML  

    CdSe nanocrystallites capped with mercaptoacetic acid with a high intensity band edge emission were synthesized, and double layered hybrid light emitting devices with various structures were fabricated. The double layers are a blend of polyvinyl carbazole (PVK) mixed with CdSe nanoparticles and Alq3 layer, which are encapsulated between ITO as anode and LiF/Al as cathode. Different devices were fabricated by varying the CdSe concentration as well as thickness of Alq3 layer. The device that fabricated without incorporation of nanoparticles revealed an emission nearly at 510 nm, which is related to Alq3 layer with diffusion of Li ions during the deposition of Al electrode. Increasing CdSe nanoparticles concentration and decreasing Alq3 layer thickness leads to a decrease in the intensity of emission originated from CdSe nanoparticles. Mixing PVK with CdSe nanoparticles that produce emission mainly arises from trapping states, causing the shifting of emission zone to Alq3 layer. Interestingly, the device shows that the most favorable emission is the one that consists of relatively as low concentration as 20% of CdSe nanoparticles of the blend layer and has a thickness of Alq3 layer of 18 nm. View full abstract»

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  • Cryogenic Faraday Isolator Based on TGG Ceramics

    Page(s): 749 - 754
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1132 KB) |  | HTML iconHTML  

    A cryogenic Faraday isolator based on terbium-gallium garnet (TGG) ceramics has been designed and studied in experiments. Its performance capabilities at the laser radiation power of 435 W are demonstrated, and our models suggest that the isolator should perform up to 2 kW. Thermal effects-thermally induced depolarization and thermal lens in the TGG ceramics in the 89-293 K temperature range are investigated. It is shown that the TGG ceramics compares well to the TGG monocrystal as a medium for Faraday isolators, including cryogenic ones. At the same time, in contrast to the TGG monocrystal, ceramics allows creating large-aperture Faraday isolators for lasers with high-average and high-peak power. View full abstract»

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  • Linewidth and Noise Characterization for a Partially-Slotted, Single Mode Laser

    Page(s): 755 - 759
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1060 KB) |  | HTML iconHTML  

    We present an in-depth analysis of the linewidth of a partially slotted semiconductor laser utilized for single mode operation exhibiting integrability with other photonic devices. Theoretically, the reflection coefficients are calculated via the scattering matrix method and implemented within the multimode rate equations for a current-injected quantum well laser while including the effects of noise. The coupling between photon and carrier noise is included for completeness and explicitly derived in this case. The threshold current and linewidth as a function of injection current and cavity length are then calculated for an optimized slot size. Results show state-of-the-art capabilities for this laser to meet industrial requirements for linewidths well under 500 kHz. In addition, experimental data extracted via a heterodyne detection measurement of the electric field spectrum demonstrates similar trends with our theoretical calculations. View full abstract»

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  • Laguerre–Gaussian Laser-Mode Modulation Using a Coupled Cavity

    Page(s): 760 - 765
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1574 KB) |  | HTML iconHTML  

    A detailed experiment was conducted to characterize the stable fundamental-mode operation of a commercial Laguerre-Gaussian (LG)-mode vertical-cavity surface-emitting laser when single-mode-fiber optical feedback was applied. Two steady-state beam profiles of laser output were established and four radial-intensity profiles obtained through simulation were compared with experimental results. The steady high-order mode can be applied in technology featuring a unitary wavelength and multiple connections. An oscillating competition state of the coupled patterns was analyzed; in this state, the laser output between an LG beam and a Gaussian beam was established after optical feedback. View full abstract»

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  • Quantifying the Complexity of the Chaotic Intensity of an External-Cavity Semiconductor Laser via Sample Entropy

    Page(s): 766 - 773
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1347 KB) |  | HTML iconHTML  

    This paper presents detailed numerical investigations of quantifying the complexity of the chaotic intensity obtained from the well-known Lang-Kobayashi model for an external-cavity semiconductor laser (ECSL) using sample entropy (SampEn). We demonstrate that the modified SampEn could be an alternative to quantify the underlying dynamics of an ECSL under the condition that the dimension, radius, and time delay of the delayed vectors are properly selected. The numerical results are supported by the earlier numerical studies using the permutation entropy and Kolmogorov-Sinai entropy. Furthermore, we also confirm that the SampEn shows certain robustness to the additive observational noise. View full abstract»

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  • A Quasi-Analytic Modal Expansion Technique for Modeling Light Emission From Nanorod LEDs

    Page(s): 774 - 781
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1631 KB) |  | HTML iconHTML  

    A mathematical model, based on cylindrical modes, capable of predicting the far-field angular emission pattern resulting from emission within cylindrical nanostructures is demonstrated and shown to yield self-consistent detailed numerical results. This method is much less computationally intensive than the prevailing finite-difference time-domain method and potentially provides more insight into the physics responsible for predictions. When considering the fundamental HE11 mode in isolation, the emission intensity within 1° of the nanorod axis is shown to vary by 10% as the separation δz between quantum wells is varied. Some of the modes can be shown to correspond with features observed in experimental emission patterns obtained by angular photoluminescence. View full abstract»

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  • Corrections to “Impact of the Quantum Well Gain-to-Cavity Etalon Wavelength Offset on the High Temperature Performance of High Bit Rate 980-nm VCSELs” [Aug 14 613-621]

    Page(s): 782
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (73 KB) |  | HTML iconHTML  

    In the above paper (ibid., vol. 50, no. 8, pp. 613-621, Aug. 2014), the sixth author was misidentified. His name should have read James A. Lott in the byline and in his biography. View full abstract»

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  • [Blank page]

    Page(s): B783 - B784
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  • IEEE Journal of Quantum Electronics information for authors

    Page(s): C3
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  • [Blank page - back cover]

    Page(s): C4
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Aims & Scope

The IEEE Journal of Quantum Electronics is dedicated to the publication of manuscripts reporting novel experimental or theoretical results in the broad field of the science and technology of quantum electronics..

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
Aaron R. Hawkins
Brigham Young University