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# IEEE Journal of Quantum Electronics

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Displaying Results 1 - 25 of 29
• ### [Front cover]

Publication Year: 2009, Page(s): C1
| PDF (237 KB)
• ### IEEE Journal of Quantum Electronics publication information

Publication Year: 2009, Page(s): C2
| PDF (37 KB)

Publication Year: 2009, Page(s):573 - 574
| PDF (51 KB)
• ### Design and Fabrication of AlGaN-Based Resonant-Cavity-Enhanced p-i-n UV PDs

Publication Year: 2009, Page(s):575 - 578
Cited by:  Papers (9)
| | PDF (571 KB) | HTML

AlGaN-based resonant-cavity-enhanced (RCE) p-i-n photodetectors (PDs) for operating at the wavelength of 330 nm were designed and fabricated. A 20.5-pair AlN/Al0.3Ga0.7N distributed Bragg reflector (DBR) was used as the back mirror and a 3-pair AlN/Al0.3Ga0.7N DBR as the front one. In the cavity is a p-GaN/i-GaN/n-Al0.3Ga0.7N struct... View full abstract»

• ### Refractive Index Dynamics and Linewidth Enhancement Factor in $p$-Doped InAs–GaAs Quantum-Dot Amplifiers

Publication Year: 2009, Page(s):579 - 585
Cited by:  Papers (9)
| | PDF (678 KB) | HTML

Using a pump-probe differential transmission experiment in heterodyne detection, we measured the refractive index dynamics at the ground-state excitonic transition in electrically pumped InAs/GaAs quantum-dot amplifiers emitting near 1.3 mum at room temperature. We compare three samples differing only in the level of p-doping, and interpret the measured index changes taking into account the... View full abstract»

• ### Characterization of Quantum-Cascade Lasers Using Single-Pass Transmission Spectroscopy

Publication Year: 2009, Page(s):586 - 593
Cited by:  Papers (2)
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The study of the electron distribution and intersubband transitions in quantum cascade (QC) lasers provides fundamental insights into the laser operation. Measurements on intersubband transitions are often performed on QC lasers under nonoperating conditions, i.e., at zero electric field. In this study, a single-pass transmission technique that allows for probing of QC lasers under operating condi... View full abstract»

• ### Phase-Noise-Compensated Optical Frequency-Domain Reflectometry

Publication Year: 2009, Page(s):594 - 602
Cited by:  Papers (23)  |  Patents (1)
| | PDF (480 KB) | HTML

The theory of phase-noise-compensated optical frequency-domain reflectometry (PNC-OFDR), a novel type of optical frequency-domain reflectometry (OFDR) with a measurement range much longer than the laser coherence length, is described, and the signal and noise spectral densities are deduced for a discussion of signal-to-noise ratio (SNR). The analysis of PNC-OFDR shows the possibility of obtaining ... View full abstract»

• ### An Electrooptic Multiple-Quantum-Well Device for Image Processing

Publication Year: 2009, Page(s):603 - 608
Cited by:  Papers (2)
| | PDF (614 KB) | HTML

We investigated the use of an analog self-electrooptic effect device based on GaAs multiple quantum wells as an image processor chip to early vision processes. We focused our attention at the edge detection process using layouts of photodetectors to extract Laplacians of images. Laplacians of linear, constant, step, and Gaussian intensity profiles agree with the expected values. These results show... View full abstract»

• ### Measurement and Simulation of Distributed-Feedback Tapered Master-Oscillator Power Amplifiers

Publication Year: 2009, Page(s):609 - 616
Cited by:  Papers (37)
| | PDF (670 KB) | HTML

The spectral and spatial behavior of monolithically integrated distributed-feedback tapered master-oscillator power amplifiers emitting around 973 nm is experimentally and theoretically investigated. We demonstrate a good agreement between experiments and theory and analyze peculiarities of the observed dynamical regimes. View full abstract»

• ### Optimization of InGaN–GaN MQW Photodetector Structures for High-Responsivity Performance

Publication Year: 2009, Page(s):617 - 622
Cited by:  Papers (16)
| | PDF (971 KB) | HTML

InGaN-GaN multiple-quantum-well (MQW)-based photodetectors, with a detection edge at 450 nm and a high responsivity, have been fabricated and characterized. We show that the performance of MQW-based photodetectors strongly depends on a proper device design, i.e., number of QWs, and barrier and blocking layer thickness and doping level. Namely, the responsivity can be varied in the ~ 1 to ~ 100 mA/... View full abstract»

• ### Optimal Doping Density for Quantum-Well Infrared Photodetector Performance

Publication Year: 2009, Page(s):623 - 628
Cited by:  Papers (13)
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We present a systematic study on a set of n-type GaAs-AlGaAs quantum-well infrared photodetectors (QWIPs) with varying Si doping density in the wells. It is revealed that the increase in doping density enhances proportionally the absorption efficiency and responsivity while increasing exponentially the dark current and hence the dark current noise. We experimentally confirm the theoreticall... View full abstract»

• ### Extinction Ratio Improvement Due to a Bogatov-Like Effect in Ultralong Semiconductor Optical Amplifiers

Publication Year: 2009, Page(s):629 - 636
Cited by:  Papers (10)
| | PDF (730 KB) | HTML

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 si... View full abstract»

• ### Optical Switching Based on the Conditional Faraday Effect With Electron Spins in Quantum Dots

Publication Year: 2009, Page(s):637 - 645
Cited by:  Papers (4)
| | PDF (385 KB) | HTML

We present the theoretical foundation of a novel concept for optical switching based on the conditional Faraday effect with electron spins in quantum dots (QDs). Calculations for light of wavelengths lambda = 1.3 mum and lambda = 1.55 mum show devices with active regions of a few hundred microns are possible. Case studies for both spherical and nonspherical QDs are considered, with calculations fo... View full abstract»

• ### Matching Layers in Bragg Reflection Waveguides for Enhanced Nonlinear Interaction

Publication Year: 2009, Page(s):646 - 653
Cited by:  Papers (19)
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Bragg reflection waveguides (BRWs) with matching layers placed between the core and claddings are proposed and analyzed as a means of enhancing the effective second-order optical nonlinearity. The addition of matching layers to conventional BRW structures provides extra degrees of freedom, which enable further optimization to enhance the nonlinear conversion efficiency. Pertinent parameters includ... View full abstract»

• ### Theoretical Investigation for Reducing Polarization Sensitivity in Si-Nanowire-Based Arrayed-Waveguide Grating (de)Multiplexer With Polarization-Beam-Splitters and Reflectors

Publication Year: 2009, Page(s):654 - 660
Cited by:  Papers (7)
| | PDF (909 KB) | HTML

A novel design for reducing polarization sensitivity in silicon-on-insulator-based arrayed-waveguide grating (AWG) (de)multiplexer is presented. Each arrayed waveguide has two sections separated by a polarization beam splitter (PBS). These two sections have different core widths and length differences. With these PBSs, one polarization is reflected and the other one goes through. The through polar... View full abstract»

• ### Quantitative Study of Optical Frequency Noise to Intensity Noise Conversion in Line-by-Line Pulse Shaping

Publication Year: 2009, Page(s):661 - 673
Cited by:  Papers (1)
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We report the first quantitative study of intensity noise induced in line-by-line pulse shaping in response to time-varying changes in the comb frequency offset. Controllable comb linewidth broadening is synthesized through frequency dithering of a continuous-wave laser that is fed to a phase modulator. An electrical spectrum analyzer is used to examine the current power spectra of shaped time-dom... View full abstract»

• ### Demonstration of Bias-Controlled Algorithmic Tuning of Quantum Dots in a Well (DWELL) MidIR Detectors

Publication Year: 2009, Page(s):674 - 683
Cited by:  Papers (24)
| | PDF (1137 KB) | HTML

The quantum-confined Stark effect in intersublevel transitions present in quantum-dots-in-a-well (DWELL) detectors gives rise to a midIR spectral response that is dependent upon the detector's operational bias. The spectral responses resulting from different biases exhibit spectral shifts, albeit with significant spectral overlap. A postprocessing algorithm was developed by Sakoglu that exploited ... View full abstract»

• ### A Nonlinear Switch Based on Irregular Structures and Nonuniformity in Doped Photonic Crystal Fibers

Publication Year: 2009, Page(s):684 - 693
Cited by:  Papers (2)
| | PDF (1500 KB) | HTML

We propose a novel nonlinear switch-based on the irregularity in a three-core-doped photonic crystal fiber (PCF). We numerically investigate the proposed structure, which consists of air holes arranged in a triangular lattice around two defects separated by a single Er-Yb doped core. Its switching operation is based on the gain change in the doped core due to the nonuniformity and irregular struct... View full abstract»

• ### Optimum Design for 160-Gb/s All-Optical Time-Domain Demultiplexing Based on Cascaded Second-Order Nonlinearities of SHG and DFG

Publication Year: 2009, Page(s):694 - 699
Cited by:  Papers (4)
| | PDF (452 KB) | HTML

All-optical time-domain demultiplexing based on cascaded second-order nonlinearities of second-harmonic generation and difference-frequency generation in quasi-phase-matched periodically poled lithium niobate waveguides is discussed in order to maximize conversion efficiency and control crosstalk under the given level. The three parameters, including the waveguide length, clock pulsewidth, and clo... View full abstract»

• ### InGaAs/GaAs 0.98- $mu{hbox {m}}$ Low-Divergence Central-Lobe Semiconductor Lasers With $delta$ -Doped Resonant Tunneling Quantum Wells

Publication Year: 2009, Page(s):700 - 7010
Cited by:  Papers (1)  |  Patents (2)
| | PDF (474 KB) | HTML

In this paper, we describe a new structure design for producing low-threshold, high-efficiency, and high-brightness 0.98-mum lasers. In this structure, we incorporated a self-discriminating weak optical confinement asymmetrical waveguide coupled to passive waveguides, and an active region based on three InGaAs quantum wells (QWs) coupled to Te n-type delta-doping. Optimized coupling between the de... View full abstract»

• ### Nearly Shot-Noise-Limited Performance of Dual-Channel Linear Optical Sampling for Ultrafast DPSK Signals

Publication Year: 2009, Page(s):711 - 719
Cited by:  Papers (7)  |  Patents (1)
| | PDF (620 KB) | HTML

This paper describes a newly developed dual-channel linear optical sampling technique for observing ultrafast optical differential phase-shift keying (DPSK) signals. As the proposed measurement scheme offsets two parallel interferometers by a relative delay corresponding to 1-symbol length of the DPSK signal, the measured phase distribution reflects the signal quality which is determined by the ph... View full abstract»

• ### On the Effects of an Antireflection Coating Impairment on the Sensitivity to Optical Feedback of AR/HR Semiconductor DFB Lasers

Publication Year: 2009, Page(s):720 - 729
Cited by:  Papers (8)
| | PDF (1412 KB) | HTML

The sensitivity to optical feedback of 1.55- mum antireflection (AR)/high-reflection (HR) DFB semiconductor lasers is presented in this paper. The onset of the coherence collapse, which is the most critical feedback regime for optical transmissions, is theoretically investigated with a stress on its dependence with facet phase effects (FPEs). Taking into account FPEs on both facets, the sensitivit... View full abstract»

• ### Voltage Tunability of Quantum Cascade Lasers

Publication Year: 2009, Page(s):730 - 736
Cited by:  Papers (15)
| | PDF (1144 KB) | HTML

The voltage tunability of three types of quantum cascade laser designs is investigated. The tuning coefficients and tuning ranges of electroluminescence and laser emission from all designs are measured and compared with the calculated results. A reduced tunability was observed in all lasers above threshold. This is attributed to the decrease of resistance across the laser active region (AR) as the... View full abstract»

• ### Quantum Efficiency Analysis of InAs–GaSb Type-II Superlattice Photodiodes

Publication Year: 2009, Page(s):737 - 743
Cited by:  Papers (12)
| | PDF (227 KB) | HTML

We compare the experimentally measured and theoretically calculated quantum efficiency (QE), where an analytical drift-diffusion photocurrent model is used, of n+ -on-p InAs-GaSb superlattice (SL) photodiodes. With inputs of the transport parameters obtained by the electron-beam-induced current technique and absorption coefficient spectra calculated by the eight-band kldrp method for th... View full abstract»

• ### Parametric Analysis of Spin-Polarized VCSELs

Publication Year: 2009, Page(s):744 - 749
Cited by:  Papers (14)
| | PDF (229 KB) | HTML

Calculations of spin-injected vertical-cavity surface-emitting lasers (VCSELs) are presented using an efficient algorithm for solution of the steady-state rate equations in the spin-flip model. The effects of spin relaxation, birefringence, electron and photon lifetimes, linewidth factor, and the magnitude and ellipticity of the pumping are investigated. After a review of published values for spin... View full abstract»

## 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
Prof. Hon Ki Tsang
Chinese University of Hong Kong