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Photonics Technology Letters, IEEE

Issue 15 • Date Aug.1, 2012

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Displaying Results 1 - 25 of 41
  • [Front cover]

    Publication Year: 2012 , Page(s): C1
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    Freely Available from IEEE
  • IEEE Photonics Technology Letters publication information

    Publication Year: 2012 , Page(s): C2
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    Freely Available from IEEE
  • Table of contents

    Publication Year: 2012 , Page(s): 1265 - 1266
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  • Message Encoding/Decoding Using Unpredictability-Enhanced Chaotic VCSELs

    Publication Year: 2012 , Page(s): 1267 - 1269
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (742 KB) |  | HTML iconHTML  

    Successful message encoding/decoding in an unpredictability-enhanced chaotic vertical-cavity surface-emitting lasers (VCSELs) system is achieved numerically via the chaos-shift-keying technique. Both VCSELs are subject to variable-polarization optical feedback (VPOF), and polarization-preserved optical injection is adopted. Better decoding performance is achieved by choosing proper polarizer angle, and the security is, to some extent, enhanced owing to the VPOF. View full abstract»

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  • Feed Forward Noise Suppression in Injection Seeded WDM-PON With ASE

    Publication Year: 2012 , Page(s): 1270 - 1272
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (578 KB) |  | HTML iconHTML  

    We propose a noise suppression method using a feed forward circuit for injection-seeded WDM-PON. The required injection power is reduced by 8 dB by employing the proposed method. We investigate the limiting factors by tracing the relative intensity noise in the injection-seeded WDM-PON. Interplay of two filtering effects determines the net suppression of noise. View full abstract»

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  • Nanoprojection Lithography Using Self-Assembled Interference Modules for Manufacturing Plasmonic Gratings

    Publication Year: 2012 , Page(s): 1273 - 1275
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (491 KB) |  | HTML iconHTML  

    A new nanoprojection lithography (NPL) is proposed to manufacture plasmonic nanogratings. Here, low-cost self-assembly elastomeric polydimethylsiloxane wavy structures are used as the interference modules, with their periods and amplitudes largely controlled by the applied mechanical strain in the synthesis process. Well-defined plasmonic grating couplers with desired feature sizes and wavelengths of operation were obtained. This NPL may enable large-area and flash manufacturing of plasmonic nanogratings with tunable array periods. View full abstract»

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  • Low-Loss Microdisk-Based Delay Lines for Narrowband Optical Filters

    Publication Year: 2012 , Page(s): 1276 - 1278
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (775 KB) |  | HTML iconHTML  

    Over-coupled microdisk resonators with high intrinsic quality factors are proposed as compact and low-insertion-loss delay lines for narrowband optical filters. Design challenges including dealing with the multimode nature of the microdisk resonator and achieving a strong coupling to the selected mode are addressed. Employing the microdisk-based delay line, we demonstrate a compact first-order tunable narrowband filter in a silicon-on-insulator platform, whose 3-dB bandwidth can be tuned from 0.47 to 4 GHz within an area of 0.05 mm2. View full abstract»

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  • Guiding of Long-Range Hybrid Plasmon Polariton in a Coupled Nanowire Array at Deep-Subwavelength Scale

    Publication Year: 2012 , Page(s): 1279 - 1281
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (319 KB) |  | HTML iconHTML  

    A novel type of hybrid plasmonic waveguiding structure that integrates semiconductor and metallic nanowires has been proposed and investigated at telecommunication wavelengths. Semiconductor nanowires symmetrically placed on both sides of a metallic nanowire provide an additional degree of freedom for tuning the characteristics of the plasmonic nanowire mode. Theoretical analysis reveals that at appropriate geometrical parameters, the symmetric hybrid plasmonic mode of the waveguide could achieve subwavelength mode confinement with ultra-long propagation distance (even exceeding the millimeter range). Such a hybrid plasmonic nanowire structure could facilitate ultra-strong light-matter interaction between semiconductor and metal materials, and enable important applications in nanolasers and nonlinear photonics. View full abstract»

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  • Joint-Polarization Carrier Phase Estimation for PS-QPSK Signals

    Publication Year: 2012 , Page(s): 1282 - 1284
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (373 KB) |  | HTML iconHTML  

    We investigate a carrier phase estimation algorithm for the polarization-switched quadrature phase-shift-keying modulation format. The algorithm, which is based on the conventional block Mth power feed-forward scheme, works jointly on both polarizations and shows a significant performance improvement compared with a polarization-independent scheme. We evaluate the tolerance to laser phase noise in numerical simulations and the tolerance to nonlinear distortions in single-channel and Nyquist wavelength-division-multiplexing transmission experiments over up to 17000 km of ultralarge-effective-area fiber. View full abstract»

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  • Closed-Form Expression for the Bit-Error Rate of Spectral-Amplitude-Coding Optical CDMA Systems

    Publication Year: 2012 , Page(s): 1285 - 1287
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (184 KB) |  | HTML iconHTML  

    The spectral-amplitude-coding optical code-division multiple-access (SAC-OCDMA) technique is a vital candidate for future optical networks. Until now, there has been no exact analysis for the performance of systems using these techniques, and most researchers use upper and/or lower bounds to obtain the bit-error rate (BER) of these systems. In this letter, a more accurate analysis of the statistics, in terms of the mean and variance, of the decision current in SAC-OCDMA receivers is developed. These statistics are used to evaluate the BER of SAC-OCDMA techniques based on the Gaussian approximation method. Furthermore, the derived BER is evaluated numerically, for two different types of SAC-OCDMA codes, and is shown to fit properly between the upper and lower bounds of the BER. View full abstract»

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  • Field Trials of PNC-OFDR in Different Environments for Detecting Short Beat Lengths

    Publication Year: 2012 , Page(s): 1288 - 1291
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (410 KB) |  | HTML iconHTML  

    A spatial resolution of 10 cm was obtained for distances of 60~80 km in different field environments using phase-noise-compensated optical frequency domain reflectometry. The outstanding spatial resolution makes it possible to identify high-birefringence sections along installed cables. In field trials, we successfully observed beat lengths as small as ~20 cm, which showed that there were very large birefringence sections in the installed cables. To the best of our knowledge, this is the first time that such short beat lengths have been directly detected in a nondestructive measurement for long fibers, and the result will be very useful in relation to fiber management. View full abstract»

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  • Flip Chip Quantum-Dot Semiconductor Disk Laser at 1200 nm

    Publication Year: 2012 , Page(s): 1292 - 1294
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (525 KB) |  | HTML iconHTML  

    In this letter, we present the first 2-W flip chip quantum-dot (QD) semiconductor disk laser operating at 1200 nm. Compared to other techniques used for thermal management, e.g., intracavity heat spreader approach, the flip chip design preserves undisturbed optical spectrum and exhibits low intracavity losses. The latter is particularly essential for power scaling of lasers with QD gain media. View full abstract»

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  • Differential Techniques for High-Resolution BOTDA: An Analytical Approach

    Publication Year: 2012 , Page(s): 1295 - 1297
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (246 KB) |  | HTML iconHTML  

    We derive an analytical solution for the differential gain in Brillouin optical time-domain analysis. The found solution gives insight into the mechanisms leading to the high-spatial and spectral resolution observed in differential schemes. An experimental test has been carried out to validate the analytical solution. View full abstract»

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  • Enhanced Light Extraction Efficiency of GaN-Based LEDs With 3-D Colloidal-Photonic-Crystal Bottom Reflector

    Publication Year: 2012 , Page(s): 1298 - 1300
    Cited by:  Papers (7)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (429 KB) |  | HTML iconHTML  

    In this letter, self-assembled polystyrene nano-spheres with a diameter of 193 nm were used to fabricate the 3-D colloidal-photonic-crystal (CPC) bottom reflector for blue GaN-based light-emitting diodes (LEDs). Experimentally, the key point is the hydrophilic treatment of substrate and immediately to disperse the suspension into the substrate at 30 °C. The equilibrium between the particle transport and crystallization in the aqueous solution helps CPCs to form a faced-centered-cubic phase when the solution temperature decreases. This will lead to the improvement of reflectivity due to reduced defects, such as dislocations and vacancies, in the CPCs. The light output intensity of the LEDs fabricated with a well-controlled 3-D-CPC bottom reflector increases by 219% compared to that of conventional LEDs without it. View full abstract»

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  • Generation of 16-QAM-OFDM Signals Using Selected Mapping Method and Its Application in Optical Millimeter-Wave Access System

    Publication Year: 2012 , Page(s): 1301 - 1303
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (809 KB) |  | HTML iconHTML  

    A simplified full-duplex 60-GHz optical millimeter-wave access system is proposed and experimentally demonstrated with a 16-QAM-OFDM downlink generated by selected mapping (SLM). The system receiver is realized with optical heterodyne detection and electrical self-mixing down-conversion. In the experiment, 5-Gb/s 16-QAM-OFDM signals are transmitted over 42-km SMF-28 and a 0.4-m wireless channel. The experimental results show that SLM can effectively reduce the peak-to-average power ratio and improve the receiver sensitivity. In addition, the proposed self-mixing down-conversion can simplify the transmitter and receiver configuration, since it eliminates the need for high-frequency microwave source at the central station and local oscillator at the base station. View full abstract»

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  • Orthogonal Single-Polarization Single-Core Photonic Crystal Fiber for Wavelength Splitting

    Publication Year: 2012 , Page(s): 1304 - 1306
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (543 KB) |  | HTML iconHTML  

    A novel photonic crystal fiber (PCF) with a single core, rather than two cores, for wavelength splitting application has been proposed through the full-vector finite-element method. The light located in the 1.31- and 1.55- μm bands propagates through orthogonal polarization states in the proposed fiber. For a propagation distance of 20 mm, the 20-dB bandwidth for the same x- or y-polarized modes within the 1.31- and 1.55- μm wavelength bands could, respectively, reach 20.5 and 45.3 nm, which is much wider than that of a two-core PCF. View full abstract»

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  • Hybrid Silicon-PDMS Optofluidic ARROW Waveguide

    Publication Year: 2012 , Page(s): 1307 - 1309
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (358 KB) |  | HTML iconHTML  

    A hybrid silicon-poly (dimethysiloxane) (PDMS) liquid core antiresonant reflecting optical waveguide (ARROW) is proposed and analyzed. The waveguide hollow core is defined in the bottom silicon wafer sealed by a top PDMS layer. This configuration permits a strongly simplified fabrication process with respect to conventional full silicon-based ARROW waveguides. Furthermore, the transparent PDMS permits out-of-plane light detection and excitation improving the sensing capability. The numerical simulations and the experimental results show that a low loss liquid core ARROW waveguide with a broadband output transmission spectrum can be achieved. View full abstract»

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  • Single Trench SiON Waveguide TE-TM Mode Converter

    Publication Year: 2012 , Page(s): 1310 - 1312
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (428 KB) |  | HTML iconHTML  

    A TE-TM mode converter fabricated in a single trench SiON waveguide is described. The device has the advantage that only single masking and etching process is needed to fabricate it. We discuss the design of the mode converter from the view point of fabrication tolerance. The single trench structure is fabricated using the reactive ion-etch lag phenomenon. A 97% TE-TM mode conversion (extinction ratio=15 dB) is demonstrated at a wavelength of 1.27μm . An excess loss is measured to be 0.8 dB. View full abstract»

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  • Mach–Zehnder-Based Four-Port Switching Module on SOI

    Publication Year: 2012 , Page(s): 1313 - 1315
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (947 KB) |  | HTML iconHTML  

    In this letter, a Mach-Zehnder-based four-port switching module was designed and fabricated by a 0.8-μm standard commercial complementary metal-oxide semiconductor line. The module is composed of five electro-optic switching elements and can be used to realize nonblocking switching for the duplex interconnection among four ports. The switching elements are electrically driven with a nanosecond response. Full routing functionality of the four-port switching module is demonstrated with crosstalk levels lower than -11.8 dB under a common spectral bandwidth of 40 nm. View full abstract»

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  • Optical UWB Waveform Generation Using a Micro-Ring Resonator

    Publication Year: 2012 , Page(s): 1316 - 1318
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (410 KB) |  | HTML iconHTML  

    Optical generation and transport of ultra-wideband (UWB) pulses extends the reach of these weak signals to several kilometers by exploiting passive optical networks. At the remote node, the UWB transmitter should be low cost and compact in size for indoor communications. We propose and experimentally demonstrate an integrated solution based on a racetrack micro-ring resonator in silicon-on-insulator technology. The resonator filters pulses generated by a gain-switched laser. Frequency-to-time mapping is obtained from fiber propagation. Balanced detection of the pulses ensures FCC-compliant UWB pulse generation. View full abstract»

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  • Ultrafast All-Optical Wavelet Transform Based on Temporal Pulse Shaping Incorporating a 2-D Array of Cascaded Linearly Chirped Fiber Bragg Gratings

    Publication Year: 2012 , Page(s): 1319 - 1321
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (346 KB) |  | HTML iconHTML  

    An all-optical wavelet transformer used to analyze a high-speed and broadband electrical signal is proposed and demonstrated for the first time to our knowledge. The wavelet transform is implemented based on a temporal pulse shaping system incorporating a 2-D array of cascaded linearly chirped fiber Bragg gratings (LCFBGs). An electrical signal to be analyzed is applied to a Mach-Zehnder modulator to modulate the optical spectrum of a time-stretched optical pulse from a mode-locked laser. Each individual LCFBG in the 2-D array functions as a wavelet filter to filter a specific range of the spectrum, which is equivalent to applying a window function to the corresponding section of the temporal signal, and at the same time, as a dispersive element to perform real-time Fourier transform. A Mexican Hat wavelet is employed to implement the optical wavelet transform, which can be achieved based on a specially designed LCFBG. A theoretical analysis is performed which is verified by a proof-of-concept experiment. The key feature of this technique is that it can perform multiresolution time-frequency analysis of an ultrahigh-speed electrical signal, which can give good time resolution for high-speed signals, and good frequency resolution for low-speed signals. View full abstract»

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  • Experimental Demonstration of Signal Decoding Stability on Hybrid WDM/OCDM Add/Drop Node Module for Adaptive Network

    Publication Year: 2012 , Page(s): 1322 - 1324
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (494 KB) |  | HTML iconHTML  

    In this letter, we demonstrate the decoding stability of an optical hybrid filter (OHF) node module for an adaptive network to an environment temperature fluctuation. [Error free] signal decoding was observed from a temperature range of 0° to 60°. Improving athermal mounting technology would expand the applicable temperature range of an OHF node module as the passive node. View full abstract»

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  • Continuous Wave Supercontinuum Generation Through Pumping in the Normal Dispersion Region for Spectral Flatness

    Publication Year: 2012 , Page(s): 1325 - 1327
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (316 KB) |  | HTML iconHTML  

    We demonstrate the generation of a spectrally flat continuous wave supercontinuum by pumping deep in the normal dispersion region. A Raman cascade forms up to the anomalous dispersion region, where modulation instability supercontinuum dynamics are initiated. The Raman cascade seeds the frequency up-shifted part of the continuum, leading to a spectral flatness of 5 dB from 1.15 to 2.15. View full abstract»

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  • All-ETDM 80-Gbaud (640-Gb/s) PDM 16-QAM Generation and Coherent Detection

    Publication Year: 2012 , Page(s): 1328 - 1330
    Cited by:  Papers (9)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (404 KB) |  | HTML iconHTML  

    A single-carrier 640-Gb/s polarization-division multiplexed 16-ary quadrature amplitude modulation signal is generated using electronic multiplexing to 80 Gbaud. Coherent detection and off-line signal processing equalize the limited bandwidth of the transmit and receive hardware. View full abstract»

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  • Real-Time 1.25-Gb/s Transmission Over 50-m SI-POF Using a Green Laser Diode

    Publication Year: 2012 , Page(s): 1331 - 1333
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (354 KB) |  | HTML iconHTML  

    A real-time 1.25-Gb/s transmission over a 50-m step-index plastic optical fiber (SI-POF) with -12.5-dBm sensitivity at bit error rate equal to 10-9 was achieved. The binary modulated signal was received and post-equalized using a fully integrated optical receiver. A green edge-emitting laser diode with 520 nm is used, which gives a lower attenuation over POF compared to the traditional 650-nm red laser. The launched optical power is 1 dBm, which ensures eye-safety (class 1 M) with 6-dB power margin. View full abstract»

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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