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Photonics Technology Letters, IEEE

Issue 9 • Date May1, 2012

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Displaying Results 1 - 25 of 33
  • [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): 717 - 718
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  • Editorial: Increasing the Page Limit to Permit Four-Page Letters

    Publication Year: 2012 , Page(s): 719 - 720
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  • Experimental Demonstration of an Elastic Packet Routing Node Based on OCDMA Label Coding

    Publication Year: 2012 , Page(s): 721 - 723
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (566 KB) |  | HTML iconHTML  

    We propose and demonstrate experimentally an all-optical packet routing scheme using hybrid-wavelength-division multiplexing/optical-code-division multiple access labeling for 40-Gb/s nonreturn-to-zero (NRZ) data. With no electronic control, the system forwards asynchronously packets delimited by valid label and suppresses unwanted traffic. It consists of an optical flip-flop controlled by two correlators combined with a Mach-Zehnder interferometer that selects packets for each fiber output. The experimental results show optical switching operation for the optical-code gate with an extinction ratio of 16 dB between the switched and unswitched packets and a switching time below 2 ns. Error-free operation has been successfully achieved with low-power penalty for 40-Gb/s NRZ data. View full abstract»

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  • Analysis of CMOS Compatible Cu-Based TM-Pass Optical Polarizer

    Publication Year: 2012 , Page(s): 724 - 726
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (284 KB) |  | HTML iconHTML  

    A transverse-magnetic-pass (TM-pass) optical polarizer based on Cu complementary metal-oxide-semiconductor technology platform is proposed and analyzed using the 2-D method-of-lines numerical model. In designing the optimum configuration for the polarizer, it was found that the metal-insulator-metal (MIM) polarizer structure is superior compared to the insulator-metal-insulator polarizer structure due to its higher polarization extinction ratio (PER) and low insertion loss. An optimized MIM TM-pass polarizer exhibits simulated long wavelength pass filter characteristics of >;~1.2 μ.m, with fundamental TM0 and TE0 mode transmissivity of >;70% and <;5%, respectively, and with PER ~11.5 dB in the wavelength range of 1.2-1.6 μ.m. The subwavelength and submicrometer features of this TM-polarizer are potentially suitable for compact and low power photonics integrated circuit implementation on silicon-based substrates. View full abstract»

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  • Generation of Flat Optical-Frequency Comb Using Cascaded Intensity and Phase Modulators

    Publication Year: 2012 , Page(s): 727 - 729
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (801 KB) |  | HTML iconHTML  

    A scheme using one intensity modulator and two phase modulators driven directly by sinusoidal waveform to generate an optical-frequency comb (OFC) is experimentally demonstrated. It is relatively simple, where Bragg grating or specially tailored waveforms are not used. By setting the ratio of direct-current bias to half-wave voltage and phase shifts between sinusoidal waveform applied on the intensity and two phase modulators at appropriate values, 29 comb lines with spectral power variation less than 1.5 dB at 10 GHz are obtained. And the scheme has adjustability; a flat-top OFC with frequency spacing of 9.5-10 GHz is achieved. View full abstract»

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  • Tunable Fractional Order Temporal Differentiator by Optically Pumping a Tilted Fiber Bragg Grating

    Publication Year: 2012 , Page(s): 730 - 732
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (353 KB) |  | HTML iconHTML  

    We propose and demonstrate an optically tunable photonic fractional temporal differentiator using a tilted fiber Bragg grating written in an erbium/ytterbium (Er-Yb) co-doped fiber. Thanks to the high absorption of the Er-Yb co-doped fiber, when it is pumped the refractive index is changed, and thus the phase of a cladding mode resonant wavelength is changed continuously by continuous tuning of the pumping power. By locating the wavelength of the input light wave at the location of a cladding mode resonant wavelength, a temporal differentiator with a tunable fractional order is achieved. The proposed technique is experimentally evaluated. A temporal differentiator with a tunable fractional order is demonstrated. The use of the fractional differentiator to implement temporal differentiation of a Gaussian pulse with a bandwidth of 28 and 75 GHz is also demonstrated. View full abstract»

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  • Simple Estimation of the XPM-Induced Phase Error Variance in Hybrid OOK-PSK Systems

    Publication Year: 2012 , Page(s): 733 - 735
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (256 KB) |  | HTML iconHTML  

    The variance of cross-phase modulation-phase error induced by low bit rate on-off keying (OOK) channels is analytically estimated based on the stochastic properties of random binary sequences. These results may be applied to coherent quadrature phase-shift keying transmission systems with neighboring 10-Gb/s OOK channels. View full abstract»

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  • Multistandard Wireless Transmission Over SSMF and Large-Core POF for Access and In-Home Networks

    Publication Year: 2012 , Page(s): 736 - 738
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (707 KB) |  | HTML iconHTML  

    An end-to-end transmission of coexisting multistandard radio (LTE, WiMAX, and UWB) signals is demonstrated for the first time with the transmission over a combined access and in-home networks consisting of 25-km SSMF, 25-m large-core diameter polymethylmethacrylate graded-index plastic optical fiber link and 1-m wireless. The residential gateway includes O-E-O conversion to connect the access and in-home parts of the networks. This letter demonstrates a fully integrated radio signal distribution scenario from the central station to the end-user personal area networks. View full abstract»

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  • Pilot-Symbols-Aided Carrier-Phase Recovery for 100-G PM-QPSK Digital Coherent Receivers

    Publication Year: 2012 , Page(s): 739 - 741
    Cited by:  Papers (15)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (290 KB) |  | HTML iconHTML  

    A feedforward pilot-symbols-aided carrier-phase recovery scheme is described. The approach relies on pilot symbols that are time-division multiplexed with the transmitted data. In the scheme, an initial coarse estimation of the optical carrier phase, exploiting the knowledge of pilot symbols, is followed by a fine nondata-aided, or blind, estimation. The main advantage of the proposed solution is that of avoiding the phase- ambiguity problem after a cycle slip. The overhead and the impact on the performance of pilot symbols are investigated for long-haul transmission of 100-Gb/s polarization-multiplexed quadrature phase-shift keying wavelength-division-multiplexing signals in different scenarios. For homogeneous transmission, the proposed scheme outperforms blind carrier recovery with differential decoding. View full abstract»

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  • Turnaround-Point Long-Period Fiber Gratings (TAP-LPGs) as High-Radiation-Dose Sensors

    Publication Year: 2012 , Page(s): 742 - 744
    Cited by:  Papers (9)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (299 KB) |  | HTML iconHTML  

    This letter reports the application of turnaround-point (TAP) long-period gratings (LPGs) for radiation dosimetry. The LPGs were realized using the laser-writing technique. After a gamma dose of 6 kGy, the TAP-LPGs show a radiation-induced shift of more than 35 nm for each of the dual resonance dips, which is the highest shift reported to date for any type of fiber gratings. These LPGs can therefore be used as radiation sensors down to doses of a few Gy with modest wavelength-resolving instrumentation. The LPGs show significant sensitivity of wavelength shifts up to 80 nm for a dose of 65 kGy. We attribute the very high radiation sensitivity to near-TAP operation and doping of Boron in the fiber. This should open up applications of LPGs to radiation dosimetry. View full abstract»

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  • Polarization Switching in Vertical-Cavity Surface-Emitting Lasers With Anisotropic Cavity Geometry and Injection

    Publication Year: 2012 , Page(s): 745 - 747
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (321 KB) |  | HTML iconHTML  

    Vertical-cavity surface-emitting lasers with anisotropic cavity geometry and current injection capable of bias-dependent polarization switching are demonstrated. A cruciform-shaped photonic crystal defect and ion-implanted aperture defines the transverse cavity which is combined with perpendicularly positioned metal contacts for orthogonal electron injection paths. The dominant polarization is determined by the direction of current injection rather than the crystallographic axes as found in isotropic cavities. In addition to polarization control and switching, this type of laser has potential for a novel digital modulation scheme with low-operating-power and high-extinction ratio. The authors achieve 9-dB switching contrast with switching amplitude, with the modulation speed thermally limited. View full abstract»

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  • All-Optical T-Flip-Flop Using a Single SOA-MZI-Based Latching Element

    Publication Year: 2012 , Page(s): 748 - 750
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (291 KB) |  | HTML iconHTML  

    The authors demonstrate a novel all-optical T-flip-flop (TFF) layout utilizing a single optical latching element that comprises an integrated semiconductor optical amplifier and Mach-Zehnder inteferometer and a feedback loop. Experimental proof-of-concept verification is presented at 8 Mb/s using off-the-shelf bulk components and a fiber-based feedback implementation. The proposed TFF architecture requires the minimum number of active components and just a single toggling signal as input. Its simple circuit design is amenable with photonic integration and holds the credentials for operation at multi-Gb/s speeds. View full abstract»

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  • Perfectly Orthogonal Optical Single-Sideband Signal Generation Based on Stimulated Brillouin Scattering

    Publication Year: 2012 , Page(s): 751 - 753
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (396 KB) |  | HTML iconHTML  

    We experimentally demonstrate a perfectly orthogonal optical single-sideband signal generation technique using stimulated Brillouin scattering. By using both the Brillouin gain and loss, a perfectly orthogonal optical single-sideband signal is achieved. In addition, the modulation depth of the single-sideband signal is adjustable by separately tuning the gain and loss for the optical carrier. View full abstract»

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  • Tunable High-Order Harmonic Mode-Locking in Yb-Doped Fiber Laser With All-Normal Dispersion

    Publication Year: 2012 , Page(s): 754 - 756
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (326 KB) |  | HTML iconHTML  

    A tunable high-order harmonic and passively mode-locked Yb-doped fiber laser with all-normal dispersion is demonstrated. Using the mode-locking mechanism of the nonlinear polarization evolution (NPE) effect and a cascade long period fiber grating (C-LPFG) as an all-fiber format spectral filter for the strong pulse shaping, a maximum of 14th-order harmonic mode-locked (HML) Yb-doped fiber laser can be tunably achieved with a repetition rate of 35.497 MHz compared with the fundamental repetition rate of 2.538 MHz, which is the highest harmonic mode-locked laser with all-normal dispersion so far. At the 14th HML output, the cavity supermodes are suppressed to 23 dB, and the pulses duration is 1.23 ns with a maximum pulse energy of 0.97 nJ. View full abstract»

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  • 4 ,\times, 4 InAlGaAs/InAlAs Optical-Switch Fabric by Cascading Mach–Zehnder Interferometer-Type Optical Switches With Low-Power and Low-Polarization-Dependent Operation

    Publication Year: 2012 , Page(s): 757 - 759
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (892 KB) |  | HTML iconHTML  

    High-speed optical switches are essential devices to construct next-generation optical networks. We have studied 22 InAlGaAs/InAlAs hybrid-waveguide-type Mach-Zehnder interferometer-type optical switches and demonstrated low-polarization-dependent switching operation with crosstalks of less than , injection currents of about 5 mA, and response times of about 3 ns. In this letter, our conventional 22 optical switch was extended to a 44 optical-switch fabric by a cascading approach. As a result, fundamental switching operation was confirmed with low power consumption and low polarization dependence. View full abstract»

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  • Transmission Over 608 km of Standard Single-Mode Fiber Using a 10.709-Gb/s Chirp Managed Laser and Electronic Dispersion Precompensation

    Publication Year: 2012 , Page(s): 760 - 762
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (542 KB) |  | HTML iconHTML  

    An electronic dispersion precompensation scheme for a chirp-managed directly modulated laser is described and experimentally demonstrated for transmission at 10.709 Gb/s. A single look-up-table (LUT) for the drive current is designed to mitigate the effects of fiber dispersion and the intrinsic nonlinear modulation response of the laser. Experimental results show that an 11-bit LUT can compensate the dispersion of 608 km of a standard single-mode fiber with a required optical-signal-to-noise ratio of 14.5 dB at a bit-error ratio of 3.8 × 10-3. View full abstract»

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  • High Sensitivity Polymer Optical Fiber-Bragg-Grating-Based Accelerometer

    Publication Year: 2012 , Page(s): 763 - 765
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (236 KB) |  | HTML iconHTML  

    We report on the fabrication and characterization of the first accelerometer based on a polymer optical fiber Bragg grating (FBG) for operation at both 850 and 1550 nm. The devices have a flat frequency response over a 1-kHz bandwidth and a resonance frequency of about 3 kHz. The response is linear up to at least 15 g and sensitivities as high as 19 pm/g (shift in resonance wavelength per unit acceleration) have been demonstrated. Given that 15 g corresponds to a strain of less than 0.02% and that polymer fibers have an elastic limit of more than 1%, the polymer FBG accelerometer can measure very strong accelerations. We compare with corresponding silica FBG accelerometers and demonstrate that using polymer FBGs improves the sensitivity by more than a factor of four and increases the figure of merit, defined as the sensitivity times the resonance frequency squared. View full abstract»

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  • Single Photon Router in the Optical Regime Based on a Cavity Optomechanical System With a Bose–Einstein Condensate

    Publication Year: 2012 , Page(s): 766 - 768
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (271 KB) |  | HTML iconHTML  

    We propose a novel scheme of a single photon router based on a coupled Bose-Einstein condensate cavity system. The numerical results obtained show that by controlling the route of the probe photon using an appropriate pump beam, this coupled system can serve as a single photon router. Importantly, this router works well in the optical regime, instead of the microwave regime, and at an ultralow pump power. The scheme, proposed here, may have potential applications in optical signal processing, communication, and quantum information networks. View full abstract»

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  • Stable Time-Domain Beam Propagation Method for Modeling Ultrashort Pulse Propagation in Dispersive Optical Structures

    Publication Year: 2012 , Page(s): 769 - 771
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (261 KB) |  | HTML iconHTML  

    In this letter, the time-domain beam propagation method has been formulated and verified to model ultrashort optical pulse propagation in structures containing material dispersion. The nonparaxial time-domain wave equation was used to march the pulsed beams using Pade approximant technique. The method has been tested using three different Lorentzian dispersive profiles. It has been observed that the new technique is very stable, accurate, and efficient in modeling ultrashort pulse propagation in long dispersive optical structures. View full abstract»

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  • 160-GBaud DQPSK Optical Time-Division Demultiplexing Using a Polarization Modulator

    Publication Year: 2012 , Page(s): 772 - 774
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (443 KB) |  | HTML iconHTML  

    We propose and experimentally demonstrate a scheme for demultiplexing 160-GBaud differential quadrature phase shift keying optical time-division-multiplexing signals to 40-GBaud tributaries based on a polarization modulator (PolM) connected within a fiber loop. The PolM is used instead of a Mach-Zehnder modulator because the PolM reduces the insertion loss and is free from the bias drift problem since no DC bias is required. The generated optical gate is characterized with a pulsewidth of 5.4 ps, an extinction ratio larger than 15 dB, and a signal-to-noise ratio of over 28 dB at 40 GHz. Error-free performance is achieved with a power penalty of 1.8 dB in the worst case. View full abstract»

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  • Spectrum-Sliced Microwave Photonic Filter With an Improved Dynamic Range Based on a {\rm LiNbO}_{3} Phase Modulator and Balanced Detection

    Publication Year: 2012 , Page(s): 775 - 777
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (351 KB) |  | HTML iconHTML  

    A spectrum-sliced microwave photonic filter with an improved spurious-free dynamic range (SFDR) is proposed and experimentally demonstrated. The basic principle is based on the polarization-sensitive modulation in a phase modulator and the dispersion-induced linear/nonlinear phase-to-intensity conversion. A simultaneous noise and nonlinearity reduction is further achieved via polarization diversity and balanced detection, giving rise to an improved SFDR. In the experiments, the SFDR is measured to be 90 for the novel scheme, in contrast to 75 for the traditional configuration. View full abstract»

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  • Surface Loading Sensitivity Characterization of a Resonant Planar Optical Waveguide Stack

    Publication Year: 2012 , Page(s): 778 - 780
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (312 KB) |  | HTML iconHTML  

    Detuning of a coupled planar waveguide pair through surface loading of the top waveguide that is in contact with the analyte serves as a transducer for a Stacked Planar Affinity-Regulated Resonant Optical Waveguide (SPARROW) sensor. Here we investigate the surface loading detection sensitivity of a SPARROW transducer composed of a stack of two planar alumina waveguides grown using ion beam assisted e-beam deposition. Using a sucrose analyte solution introduced to the stack surface in a poly-di-methyl-siloxane (PDMS) microfluidic channel, the change in optical output power through the coupled waveguide pair as a function of sucrose analyte solution concentration was experimentally determined. Based on the analyte in the evanescent field penetration depth volume, the effective minimum detectable surface loading of the stack was determined to be 20 with a bulk index sensitivity of 5.6 refractive index units (RIU) for this stack configuration and experimental setup. View full abstract»

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  • Monolithic Integrated Silicon Polarization-Independent Tunable Filter Circuit With Germanium p-i-n Photodetector

    Publication Year: 2012 , Page(s): 781 - 783
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (390 KB) |  | HTML iconHTML  

    We report the design, fabrication, and characterization of a monolithic integrated silicon polarization-independent optical tunable filter circuit with germanium p-i-n photodetector (PD). We demonstrate polarization transparent filter characteristics with an extinction ratio of ~22 dB, and a 3-dB bandwidth of 0.33 nm. The tuning range of the filter is ~11.5 nm. The measured fiber-to-PD responsivity of the photonic integrated circuit is ~0.10 A/W at a reverse bias of 5 V. 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