# IEEE Photonics Technology Letters

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Displaying Results 1 - 25 of 30
• ### [Front cover]

Publication Year: 2009, Page(s): C1
| PDF (165 KB)
• ### IEEE Photonics Technology Letters publication information

Publication Year: 2009, Page(s): C2
| PDF (38 KB)

Publication Year: 2009, Page(s):955 - 956
| PDF (43 KB)
• ### VCSEL Intrinsic Response Extraction Using $T$-Matrix Formalism

Publication Year: 2009, Page(s):957 - 959
Cited by:  Papers (8)
| | PDF (161 KB) | HTML

We present a new method to remove the parasitics contribution to the vertical-cavity surface-emitting laser (VCSEL) chip response, in order to obtain the intrinsic S 21 behavior. We demonstrate that the chip can be split into two cascaded subsystems representing the electrical access and the optical cavity, respectively. An equivalent electrical circuit defining the behavior of t... View full abstract»

• ### Silicon-on-Insulator (SOI) Ring Resonator-Based Integrated Optical Hydrogen Sensor

Publication Year: 2009, Page(s):960 - 962
Cited by:  Papers (23)
| | PDF (140 KB) | HTML

We demonstrate a novel, highly sensitive integrated hydrogen sensor based on a silicon ring resonator on the silicon-on-insulator platform. The hydrogen sensitive element in the sensor structure is a platinum-doped tungsten oxide catalytic coating. The catalytic combustion of hydrogen in air leads to a local temperature rise in the ring resonator. The resulting thermo-optic effect shifts the ring ... View full abstract»

• ### Packaging-Induced Strain Measurement Based on the Degree of Polarization in GaAsP–GaInP High-Power Diode Laser Bars

Publication Year: 2009, Page(s):963 - 965
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The strain caused by device packaging was studied in high-power semiconductor laser bars by measuring the degree of polarization. Polarization measurement with intentionally GaAsP-GaInP strained laser bar packaged on a Cu heat sink for 799-nm emission revealed the variation of band edges between the conduction band and heavy-hole or light-hole bands in the active region. This served as a method fo... View full abstract»

• ### In-Plane Optical Anisotropy of GaN Refractive Index in Visible Light Region

Publication Year: 2009, Page(s):966 - 968
Cited by:  Papers (7)
| | PDF (397 KB) | HTML

The optical properties of metal-organic chemical vapor deposition gallium nitride layers were measured with the use of a grating-assisted optical coupler. The application of a waveguide-based grating structure for in-coupling of radiated modes was the basis of the work presented here. A set of six grating couplers, providing different propagation angles Phi with respect to the a-axis of GaN... View full abstract»

• ### Microwave Correlator Based on a Nonuniformly Spaced Photonic Microwave Delay-Line Filter

Publication Year: 2009, Page(s):969 - 971
Cited by:  Papers (11)
| | PDF (186 KB) | HTML

We propose and demonstrate a novel technique to perform matched filtering of a phase-coded microwave signal using a photonic microwave delay-line filter. The photonic microwave delay-line filter is designed to have a frequency response that is conjugate to the spectrum of the phase-coded microwave signal. To implement the delay-line filter, the tap coefficients are usually complex, which is diffic... View full abstract»

• ### Synthesis of a 4 $times$ 4 Walsh–Hadamard Transformer Using Long-Period Waveguide Grating Arrays

Publication Year: 2009, Page(s):972 - 974
Cited by:  Papers (4)
| | PDF (108 KB) | HTML

Synthesis of discrete unitary transformations using long-period grating arrays are analyzed. Matrix analysis of the coupled-mode equations is used to derive the conditions for the generation of unitary transformations on coherent spatial optical signals. General expressions for the transform matrix are derived. In particular, the grating parameters for the synthesis of a 4 times 4 Walsh-Hadamard t... View full abstract»

• ### Effect of N-Type AlGaN Layer on Carrier Transportation and Efficiency Droop of Blue InGaN Light-Emitting Diodes

Publication Year: 2009, Page(s):975 - 977
Cited by:  Papers (46)
| | PDF (452 KB) | HTML

The effect of an n-type AlGaN layer on the physical properties of blue InGaN light-emitting diodes (LEDs) is investigated numerically. The p-type AlGaN electron-blocking layer is usually used in blue LEDs to reduce the electron leakage current. However, the p-type AlGaN layer also retards the injection of holes, which leads to the degradation of efficiency at high current. To improve the efficienc... View full abstract»

• ### Low Power Consumption DQPSK Demodulator Using Silica-Based Planar Lightwave Circuit

Publication Year: 2009, Page(s):978 - 980
Cited by:  Papers (1)
| | PDF (233 KB) | HTML

We demonstrate a low power consumption differential quadrature phase-shift keying (DQPSK) demodulator using silica-based planar lightwave circuit (PLC) technology. A reduction of the power consumption is achieved by suppressing the temperature dependence of the circuit characteristic and eliminating a thermo-electric cooler (TEC) device. The maximum power consumption of the fabricated demodulator ... View full abstract»

• ### Interferometric Noise Characterization and Suppression in Optical CDMA Networks

Publication Year: 2009, Page(s):981 - 983
Cited by:  Papers (5)
| | PDF (306 KB) | HTML

A solution for suppressing multiple-access interference and incoherent interferometric noise in 2-D optical code-division multiple access (CDMA) networks is demonstrated using a dispersion-imbalanced loop mirror containing a 15-m heavily GeO2-doped fiber. From the experimental study of the degradation caused by noise, bit-error-rate (BER) measurements in a two-user system having coheren... View full abstract»

• ### Polarization Characteristics of an External Cavity Diode Laser With Littman–Metcalf Configuration

Publication Year: 2009, Page(s):984 - 986
Cited by:  Papers (2)
| | PDF (236 KB) | HTML

Polarization characteristics of an external cavity diode laser (ECDL) in Littman configuration with a diffraction grating are presented in this letter. Using a conventional analyzer, it is found that both linear polarized and elliptical polarized (EP) emission can be obtained from the ECDL. It is also an EP state in the laser cavity when the output is in EP state. Experimental results indicate tha... View full abstract»

• ### Transversal Loading Sensor Based on Tunable Beat Frequency of a Dual-Wavelength Fiber Laser

Publication Year: 2009, Page(s):987 - 989
Cited by:  Papers (13)
| | PDF (193 KB) | HTML

Microwave signal generation by using the photonic beating from a phase-shift fiber Bragg grating (PS-FBG)-based dual-wavelength laser is proposed and experimentally demonstrated. The dual-wavelength laser is formed by a linear cavity, in which a PS-FBG is used as a dual-wavelength selective component. Transversal loading on the PS-FBG enhances the birefringence of the optical fiber and consequentl... View full abstract»

• ### Video-Service-Overlaid Wavelength-Division-Multiplexed Passive Optical Network

Publication Year: 2009, Page(s):990 - 992
Cited by:  Papers (8)  |  Patents (1)
| | PDF (205 KB) | HTML

We propose and demonstrate a novel wavelength-division-multiplexed passive optical network (WDM-PON) with multicast overlay. By superimposing an inverse return-to-zero multicast signal onto a nonreturn-to-zero point-to-point signal, simultaneous transmission is realized for both services. At the optical network unit (ONU), only one photodiode is required to detect both signals. No complex receiver... View full abstract»

• ### Instability of the Multimode Fiber Frequency Response Beyond the Baseband for Coherent Sources

Publication Year: 2009, Page(s):993 - 995
Cited by:  Papers (12)
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Fluctuations of the multimode fiber (MMF) frequency response beyond the baseband are observed experimentally when highly coherent light sources are used. This behavior is caused by the variation of the mode group powers caused by the relative modal phase fluctuation combined with spatial filtering at elements such as nonideal connectors. The observed effect may have vital influence on subcarrier m... View full abstract»

• ### Improvement in the Light Output Power of GaN-Based Light-Emitting Diodes by Natural-Cluster Silicon Dioxide Nanoparticles as the Current-Blocking Layer

Publication Year: 2009, Page(s):996 - 998
Cited by:  Papers (17)
| | PDF (819 KB) | HTML

In this study, the fabrication and characterization of InGaN-GaN multiple-quantum-well light-emitting diodes (LEDs) with silicon dioxide (SiO2) nanoparticles as the current-blocking layer (CBL) are described. The performance was improved by introducing SiO2 nanoparticles, not deposited by commonly used plasma-enhanced chemical vapor deposition, as the CBL beneath the p-pad. T... View full abstract»

• ### High-Power Tunnel-Injection 1060-nm InGaAs–(Al)GaAs Quantum-Dot Lasers

Publication Year: 2009, Page(s):999 - 1001
Cited by:  Papers (14)
| | PDF (159 KB) | HTML

High-power 1060-nm InGaAs-(Al)GaAs quantum-dot (QD) laser material was developed with an integrated InGaAs quantum film acting as a tunnel injector for electrons. In comparison to a QD laser without tunnel-injection design, the new type of lasers exhibit a strongly improved temperature stability of the threshold current and internal quantum efficiency. View full abstract»

• ### Wavelength Multicasting of 320-Gb/s Channel in Self-Seeded Parametric Amplifier

Publication Year: 2009, Page(s):1002 - 1004
Cited by:  Papers (45)
| | PDF (432 KB) | HTML

We report the first 320-Gb/s all-optical wavelength multicast experimental demonstration in two-pump parametric amplifier, assisted by pump-pump self seeding. A single 320-Gb/s channel was successfully multicast to eight wavelengths with minimal conversion efficiency of -1 dB and less than 5-dB gain ripple. Self seeding was achieved by efficient spectral management and optimization of multiple-pum... View full abstract»

• ### Wavelength Path Reconfigurable AWG-STAR Employing Coprime-Channel-Cycle Arrayed-Waveguide Gratings

Publication Year: 2009, Page(s):1005 - 1007
Cited by:  Papers (4)
| | PDF (265 KB) | HTML

We propose a novel reconfigurable AWG-STAR (physical star topology network with arrayed-waveguide grating router) that employs two kinds of cyclic-frequency arrayed-waveguide gratings whose repetition channel numbers are coprime. We demonstrate that all the wavelength paths can be assigned independently with excellent transmission characteristics. View full abstract»

• ### Polarization Switching in Quantum-Dot Vertical-Cavity Surface-Emitting Lasers

Publication Year: 2009, Page(s):1008 - 1010
Cited by:  Papers (12)
| | PDF (109 KB) | HTML

We demonstrate experimental evidence of polarization switching accompanied by polarization-mode hopping in quantum-dot vertical-cavity surface-emitting lasers. In our case, the polarization switching is associated with a change of linearly polarized light to elliptically polarized one, hence switching takes place between elliptically polarized states. Current-modulation measurements show that the ... View full abstract»

• ### Power Sharing in Dual-Wavelength Optically Pumped Midinfrared Laser

Publication Year: 2009, Page(s):1011 - 1013
Cited by:  Papers (2)
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We present a study of dual-wavelength optically pumped midinfrared semiconductor lasers, in which the effects of several design parameters are analyzed. We observe that when the short wavelength waveguide mode overlaps the long wavelength gain region, photon re-absorption occurs, favoring long wavelength emission. We demonstrate high power output from a laser emitting at two wavelength bands. View full abstract»

• ### Investigation of 43-Gb/s Transmission With a Wavelength Preserving SOA-Based Optical Regenerator

Publication Year: 2009, Page(s):1014 - 1016
Cited by:  Papers (3)
| | PDF (202 KB) | HTML

Transmission with cascaded optical regeneration based on synchronous modulation combined with optical reshaping by cross-gain compression in a semiconductor optical amplifier is investigated at 43 Gb/s over transoceanic distances (10 000 km). The proposed optical regenerator configuration performs signal reshaping and retiming while preserving the input signal wavelength. The regenerator cascadabi... View full abstract»

• ### Selection Transmit Diversity for FSO Links Over Strong Atmospheric Turbulence Channels

Publication Year: 2009, Page(s):1017 - 1019
Cited by:  Papers (45)
| | PDF (124 KB) | HTML

In this letter, transmit laser selection for multiple-input-single-output free-space optical communication systems with intensity modulation and direct detection over strong atmospheric turbulence channels is analyzed. Assuming channel side information at the transmitter and receiver, a transmit diversity technique based on the selection of the optical path with a greater value of scintillation ha... View full abstract»

• ### Low Dark Count Single-Photon Avalanche Diode Structure Compatible With Standard Nanometer Scale CMOS Technology

Publication Year: 2009, Page(s):1020 - 1022
Cited by:  Papers (82)  |  Patents (1)
| | PDF (753 KB) | HTML

A single-photon avalanche diode structure implemented in a 130-nm imaging process is reported. The device employs a p-well anode, rather than the commonly adopted p+, and a novel guard ring compatible with recent scaling trends in standard nanometer scale complementary metal-oxide-semiconductor technologies. The 50-mum 2 active area device exhibits a dark count rate of 25 Hz at 20 ... View full abstract»

## Aims & Scope

IEEE Photonics Technology Letters addresses all aspects of the IEEE Photonics Society Constitutional Field of Interest with emphasis on photonic/lightwave components and applications, laser physics and systems and laser/electro-optics technology.

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## Meet Our Editors

Editor-in-Chief
Prof. Jianping Yao
University of Ottawa