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Photonics Technology Letters, IEEE

Issue 13 • Date July1, 2010

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Displaying Results 1 - 25 of 27
  • [Front cover]

    Publication Year: 2010 , Page(s): C1
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  • IEEE Photonics Technology Letters publication information

    Publication Year: 2010 , Page(s): C2
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  • Table of contents

    Publication Year: 2010 , Page(s): 949 - 950
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  • Corrugation-Induced SiO _{2} Planar Long-Period Gratings for Photonic Applications

    Publication Year: 2010 , Page(s): 951 - 953
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (421 KB) |  | HTML iconHTML  

    A long-period grating based on silica planar lightwave circuit technology is reported. The grating structure has been realized by forming a periodic corrugation on the lower waveguide cladding layer. This structure offers a permanent refractive index modulation, resulting in a grating that is highly stable to environmental variation. A strong rejection band is observed at a specified resonance wavelength. Device sensitivity to external refractive index change of up to 2.9 × 10-6/pm can be achieved without any surface modification. Thermal characterization has demonstrated a temperature dependence of only 24.5 pm/°C . View full abstract»

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  • 10 ,\times, 224-Gb/s WDM Transmission of 56-Gbaud PDM-QPSK Signals Over 1890 km of Fiber

    Publication Year: 2010 , Page(s): 954 - 956
    Cited by:  Papers (14)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (305 KB) |  | HTML iconHTML  

    We demonstrate ten-channel wavelength-division-multiplexed (WDM) transmission of 56-Gbaud polarization-division-multiplexed quadrature phase-shift keying signals (i.e., at a line rate of 224 Gb/s) over 1890 km of fiber on a 100-GHz WDM grid (spectral efficiency of ~2 b/s/Hz). The coherent intradyne receiver digitizes the signal at 80 GSamples/s, and is followed by offline digital signal processing. View full abstract»

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  • Fabrication of a Polymeric Optical Waveguide-On-Flex Using Electrostatic-Induced Lithography

    Publication Year: 2010 , Page(s): 957 - 959
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (835 KB) |  | HTML iconHTML  

    A method has been developed for the manufacture of polymeric multimode waveguides using an electrostatic field-induced self assembly and pattern formation process. A spin-coated liquid optical polymer placed between two conductive plates experiences an electrostatic force from an applied electric field gradient across the plates. Surface electrohydrodynamics instability patterning is employed to fabricate optical core microstructures using a patterned master plate. The result shows a good replication of the pattern from the master plate to the optical polymer. The process protocols were defined to achieve waveguides with low sidewall roughness together with an optical coupling interface. We have demonstrated multimode waveguide arrays with a 50 μm × 50 μm cross section and 250-μm pitch on a 10 mm × 10 mm flexible substrate. The refractive index and absorption measurement of the electrostatic-induced optical film show insignificant changes when compared with the unexposed film. Using the cutback approach, the propagation loss of the waveguide is measured at -1.97 dB/cm. The whole fabrication process is found to be fast, cost-effective, and no photosensitive material is needed as in the conventional photolithography approach. View full abstract»

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  • Simultaneous Implementation of Photonic Logic or and and Gates for CSRZ-OOK Signals

    Publication Year: 2010 , Page(s): 960 - 962
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (405 KB) |  | HTML iconHTML  

    A simultaneous implementation of photonic or and and logic gates for 10-Gb/s carrier-suppressed return-to-zero on-off-keying (CSRZ-OOK) signals is demonstrated using degenerate and nondegenerate four-wave mixing in a 60-m highly nonlinear photonic crystal fiber (HNL-PCF). Two different wavelength combinations of three-input lights, two input CSRZ-OOK data together with a CSRZ-OOK clock, are proposed to flexibly select the output wavelength of two logic and gates and one logic or gate. Experimental demonstrations at 10-Gb/s CSRZ-OOK format with clear waveforms, correct spectra, and bit-error rate verify the logic integrity of the scheme. Although three input wavelengths with a fixed spacing must be reserved in advance, the proposed scheme is still promising for future ultra-high-speed optical signal processing applications, due to the femtosecond response of the HNL-PCF nonlinearity. View full abstract»

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  • Broadband Quantum-Dot Infrared Photodetector

    Publication Year: 2010 , Page(s): 963 - 965
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (90 KB) |  | HTML iconHTML  

    In this letter, we report the five-period quantum-dot infrared photodetectors (QDIPs) with a bi-stacked quantum-dot (QD) structure for a wide and relatively flat detection response ranging from 4 to 11 μm with high responsivities. The bi-stacked QD structure consists of a standard InAs QD and an InGaAs-capped InAs QD layer separated by a 50-nm GaAs barrier layer. The device exhibits a wide detection window in the range of 4-11 μm with high responsivities, which suggests that similar responsivities can be obtained for the standard QD and the InGaAs-capped QD layers in the mid-wavelength (MWIR) and long-wavelength (LWIR) infrared ranges, respectively. The results are advantageous for the development of broadband QDIPs covering MWIR and LWIR ranges based on the stacked QD structures. View full abstract»

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  • Photonic Crystal Cavity-Based Y Splitter for Mechano-Optical Switching

    Publication Year: 2010 , Page(s): 966 - 968
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (356 KB) |  | HTML iconHTML  

    We propose a Y splitter in a two-dimensional photonic crystal with a triangular lattice of air holes suitable for mechano-optical switching. Full switching between the two output ports can be achieved at a certain wavelength owing to the presence of a resonant central cavity with well-chosen symmetry. Experimental results confirm the operation of the device and its potential as an ultracompact mechanical switch. View full abstract»

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  • Numerical Solution of the Dynamics of Microring Resonator Modulators

    Publication Year: 2010 , Page(s): 969 - 971
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (199 KB) |  | HTML iconHTML  

    A numerical solution of the dynamics of microring resonator modulators is proposed in which the transmission process is discretized in the time domain. This solution is effective and provides theoretical rigor, and is compatible with computer programming applications. A numerical example demonstrates that the dynamic process should be taken into account at high modulation frequencies that are comparable to the free-spectral range frequency. The bandwidth of the index modulation series-coupled microring resonators is limited by the resonator linewidth. View full abstract»

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  • Terahertz Tube Lattice Fibers With Octagonal Symmetry

    Publication Year: 2010 , Page(s): 972 - 974
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (502 KB) |  | HTML iconHTML  

    A new hollow core fiber for terahertz applications consisting of dielectric tubes arranged with an octagonal symmetry is presented. Simulation results have shown that this fiber exhibits an effectively single-mode propagation with lower propagation loss with respect to hollow core fibers with a hexagonal symmetry. The suppression of higher order modes is due to a better phase-matching condition with cladding modes propagating into the hollow core of tubes. In particular, by using tubes with 44-μm thickness and outer diameters as low as 0.5 mm, a rejection of high order modes higher than 20 dB/m and fundamental mode propagation loss lower than 5 dB/m from 2.30 to 2.85 THz can be obtained. View full abstract»

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  • High-Responsivity and High-Speed Waveguide Photodiode With a Thin Absorption Region

    Publication Year: 2010 , Page(s): 975 - 977
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (272 KB) |  | HTML iconHTML  

    The characteristics of a waveguide photodiode with a thin absorption layer are reported. A responsivity of 1.08 A/W at 1.55 μm was measured using a 0.1-μm -thick absorption region with a polarization dependence of less than 0.25 dB. A thin absorption layer enables us to use a thicker intrinsic layer. Using a thicker intrinsic region of 0.9 μm and an adiabatically reduced waveguide width, a bandwidth of 42 GHz was achieved. Adopting a tapering waveguide width did not give rise to a degradation of responsivity or alignment tolerance. View full abstract»

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  • Optimization of a Broadband Gain Element for a Widely Tunable High-Power Semiconductor Disk Laser

    Publication Year: 2010 , Page(s): 978 - 980
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (399 KB) |  | HTML iconHTML  

    The layer structure of the gain element in an optically pumped semiconductor disk laser was parametrically optimized with respect to a target function specifying a desired unsaturated reflectance over a desired wavelength range at a constant pump intensity. Spectral threshold pump intensity measurements confirmed the efficacy of the design, showing a much wider low-threshold regime than a conventional nonbroadband gain element, in good agreement with simulations. This evaluation avoids the possible influence of additional factors under high-power operation. Nonetheless, having a high and nearly constant broadband unsaturated reflectance at low pump intensity is a key to obtain good high-power performance, as evidenced by the obtained continuous tuning from 967 to 1010 nm with a maximum output power of 2.6 W. View full abstract»

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  • 10-GHz All-Optical Gate Based on a III–V/SOI Microdisk

    Publication Year: 2010 , Page(s): 981 - 983
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (255 KB) |  | HTML iconHTML  

    We demonstrate an ultrafast and low-power all-optical gate in pump-probe configuration based on free-carrier- induced refractive index modulation in a 5-μm radius InP-InGaAsP microdisk heterogeneously integrated onto a silicon-on-insulator waveguide circuit. High-speed gating is obtained by extracting the carriers from the microdisk active layer by applying a reverse bias. Measured transient responses show that this gate is capable of working up to 20 GHz. View full abstract»

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  • Localized Surface Plasmon-Enhanced Nitride-Based Light-Emitting Diode With Ag Nanotriangle Array by Nanosphere Lithography

    Publication Year: 2010 , Page(s): 984 - 986
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (832 KB) |  | HTML iconHTML  

    We describe a method to enhance the light output power of nitride-based light-emitting diodes (LEDs) through the coupling of multiple quantum wells (MQWs) with localized surface plasmon (LSP). The LSP was generated on an Ag nanotriangle array (NTA) on a 40-nm-thick p-type GaN layer beneath the p-pad of the LED, which was partially etched by inductively coupled plasma system. The Ag NTA was fabricated by nanosphere lithography. The resonant frequency of a generated LSP can be precisely controlled by changing the size of the polystyrene nanosphere and the Ag deposition thickness. Under the optimum conditions, the light output power of LED with an Ag NTA was 15.4% higher than LED without an Ag NTA at an inject current of 20 mA. The improvement in light output power can be attributed to the coupling effect between MQW and LSP. View full abstract»

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  • Gain Dynamics in Quantum-Dot Semiconductor Optical Amplifiers at 1550 nm

    Publication Year: 2010 , Page(s): 987 - 989
    Cited by:  Papers (12)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (481 KB) |  | HTML iconHTML  

    We report an experimental study of the gain recovery of an InAs-InGaAsP-InP columnar-quantum-dot semiconductor optical amplifier around 1550 nm. We find a three-step recovery process that gives around 85% gain recovery in only 10 ps and 100% in around 30 ps in case of a quite complete gain saturation. We also give a possible physical explanation for the peculiar gain dynamics. View full abstract»

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  • Field-Sequential Operation of Laser Diode Pumped Nd : YVO _{4} /PPMgLN Microchip Green Laser

    Publication Year: 2010 , Page(s): 990 - 992
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (297 KB) |  | HTML iconHTML  

    A compact modulated laser-diode pumped microchip green laser is presented based on optical-contact Nd : YVO4/periodically poled MgO : LiNbO3 (Nd : YVO4/PPMgLN) crystal. Linearly polarized green light of 450 mW was achieved with a maximum electrical-to-optical efficiency (EOE) of 16.25%. A peak power of 541.5 mW and an EOE of 13.9% was obtained when pumped by a peak current of 1.96 A. This green laser is designed for mobile laser display devices and has potential to be manufactured in mass production at low cost. View full abstract»

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  • Stealth Transmission of Time-Domain Spectral Phase Encoded OCDMA Signal Over WDM Network

    Publication Year: 2010 , Page(s): 993 - 995
    Cited by:  Papers (7)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (454 KB) |  | HTML iconHTML  

    Security enhancement of stealth channel by combining time-domain spectral phase en/decoding (SPE/D) OCDMA scheme and group velocity dispersion is proposed and experimentally demonstrated. The time-domain spectral phase encoded OCDMA signal, which utilizes a linearly chirped fiber Bragg grating for pulse broadening and a high-speed phase modulator for SPE, has been stealth transmitted over a public wavelengthdivision-multiplexing network. Error-free transmission (bit-error rate <; 10-9) has been achieved for both the public and stealth channel with 32-chip 40-Gchip/s gold codes. View full abstract»

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  • Quality Standardization for Polydimethysiloxane-Based Optical Interconnect Production From Optical Aspects

    Publication Year: 2010 , Page(s): 996 - 998
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (445 KB) |  | HTML iconHTML  

    The influences of waveguide materials, fabrication conditions, and packaging substrates on the optical waveguide properties of electrical-optical circuit boards have been investigated by systematic variation of these conditions. Pt catalyst in polydimethysiloxane, casting mould sidewall roughness, interlay thickness, and packaging substrates show sensitive impact on optical waveguide insertion loss and in terms of defined target of optical loss, the basic quality criteria can be defined before production. View full abstract»

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  • All-Fiber Optical Faraday Mirror Using 56-wt%-Terbium-Doped Fiber

    Publication Year: 2010 , Page(s): 999 - 1001
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (180 KB) |  | HTML iconHTML  

    An all-fiber optical Faraday mirror that consists of a fiber Faraday rotator and a fiber Bragg grating is demonstrated. The fiber Faraday rotator uses a 21-cm-long section of 56-wt%-terbium-doped silicate fiber. The polarization state of the reflected light is rotated 89°±2° with a 16-dB polarization extinction ratio. View full abstract»

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  • Colorless FSK Demodulation and Detection With Integrated Fabry–Pérot-Type SOA/REAM

    Publication Year: 2010 , Page(s): 1002 - 1004
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (531 KB) |  | HTML iconHTML  

    A receiver for optical frequency modulated signals, based on colorless demodulation and detection, is presented. An integrated combination of semiconductor optical amplifier (SOA) and reflective electroabsorption modulator (REAM) is designed to obtain a comb-like spectral detection function, replacing the typically required costly frequency discrimination filter. The spectral properties of the designed SOA/REAM chip are discussed and the reception of a 10-Gb/s optical frequency modulated downstream signal is demonstrated, proving the applicability as receiving optical subsystem in the customer premises equipment of fiber-to-the-home access networks with wavelength reuse for upstream transmission and no downstream crosstalk. View full abstract»

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  • Noise Spectrum Characterization of Slow Light SOA-Based Microwave Photonic Phase Shifters

    Publication Year: 2010 , Page(s): 1005 - 1007
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (278 KB) |  | HTML iconHTML  

    Numerical and experimental investigations of the noise properties of semiconductor-optical-amplifier-based microwave photonic phase shifters are presented. Dependencies of the noise power spectral density on key parameters accounting for slow light propagation are reported. The effect of suppressing the red-shifted sideband at the output of the amplifier on the noise spectrum nature is widely characterized. Discussions are finally given in case of cascading several phase shifting stages. View full abstract»

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  • Photorefractive-Damage-Resistant Locally Er–Mg-Doped Near-Stoichiometric Ti : Mg : Er : LiNbO _{3} Strip Waveguides: A Way Towards New Devices

    Publication Year: 2010 , Page(s): 1008 - 1010
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (159 KB) |  | HTML iconHTML  

    We report photorefractive-damage-resistant near-stoichiometric (NS) Ti : Mg : Er : LiNbO3 strip waveguides fabricated on an initially congruent, undoped Z-cut substrate in sequence by local Er-doping in air, Mg-Ti prediffusion in wet O2 atmosphere, and post vapor-transport-equilibration. These waveguides with an initial Ti-strip width of 4-7 μm are single-mode at 1.3-1.5 μm, support only transverse-magnetic mode, and have a loss of 1.4 dB/cm. The waveguides are NS, still retain LiNbO3 phase, and show stable 1531-nm small-signal enhancement under the 980-nm pump power of at least 216 mW, implying that the photorefractive effect is effectively suppressed. The waveguides would open up a way towards new devices. View full abstract»

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  • Special issue on ultrafast science and technology

    Publication Year: 2010 , Page(s): 1011
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    Freely Available from IEEE
  • Announcing an issue of the IEEE JSTQE on NonlinearOptical Signal Processing

    Publication Year: 2010 , Page(s): 1012
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    Freely Available from IEEE

Aims & Scope

This letters journal 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.

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
Dr. Seb J. Savory
University College London