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Lightwave Technology, Journal of

Issue 15 • Date Aug.1, 2010

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Displaying Results 1 - 16 of 16
  • [Front cover]

    Page(s): C1
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  • Journal of Lightwave Technology publication information

    Page(s): C2
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  • Table of contents

    Page(s): 2097 - 2098
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  • Propagation Delay of Waveguide Photodetector

    Page(s): 2099 - 2104
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (500 KB) |  | HTML iconHTML  

    Optical phase locked loop (OPLL) photonic integrated circuits (PIC) are critical for the high dynamic range phase modulated RF/photonic links. They provide for linear phase demodulation. A challenge for implementing the OPLL PICs is how to reduce the loop propagation delay. In this paper we analyze the delay of a waveguide photodetector, which is a critical component of an OPLL. We also introduce and experimentally validate a counter propagating photodetector device concept. This enables the elimination of the propagation delay due to the finite length of a waveguide photodetector. View full abstract»

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  • OSNR Monitoring in the Presence of First-Order PMD Using Polarization Diversity and DSP

    Page(s): 2105 - 2114
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (676 KB) |  | HTML iconHTML  

    We analytically study optical signal-to-noise ratio (OSNR) monitoring using polarization diversity and digital signal processing (DSP) in the presence of first-order polarization-mode dispersion (PMD). We derived conditions on the input signal polarization, principle states of polarization (PSP) and differential group delay (DGD) of the fiber, polarization beam splitter (PBS) axes and receiver electrical low-pass filter bandwidth such that the monitored OSNR is least affected by PMD and we propose the use of a polarization scrambler (PS) before the PBS to achieve such conditions in practice. In addition, two special polarization states for which the proposed technique can operate independent of first-order PMD are identified. The theoretical predictions are verified through simulations. The analytical insights developed represent a more general and unified framework of which various OSNR monitoring techniques based on polarization diversity proposed in the literature can be understood as special cases. View full abstract»

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  • Suppression of Fiber Fuse Propagation in Hole Assisted Fiber and Photonic Crystal Fiber

    Page(s): 2115 - 2120
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1123 KB) |  | HTML iconHTML  

    We suppressed fiber fuse propagation in hole-assisted fiber (HAF) and photonic crystal fiber (PCF) with input powers above 14 W at 1480 and 1550 nm. This result indicates that the threshold power of fiber fuse propagation in HAF and PCF can be at least 10 times larger than that in conventional single-mode fiber (SMF) in the optical communication band. We also observed the dynamics of fiber fuse termination at a splice point between a test fiber (HAF or PCF) and a conventional fiber (SMF or dispersion-shifted fiber (DSF)). Our experimental results show that air holes in HAF and PCF play an important role in suppressing fiber fuse propagation. View full abstract»

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  • Fibers in Printed Circuit Boards With Passively Aligned Coupling

    Page(s): 2121 - 2128
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2781 KB) |  | HTML iconHTML  

    Several types of printed circuit boards with embedded optical glass fibers for board level optical interconnects are presented. Transmitter and receiver coupling elements were developed which are solder temperature resistant and align passively on the fiber ends of the embedded glass fibers. Further a cost-effective demonstrator system using FPGA, serializer/deserializer, VCSEL driver, and photodiode amplifiers to test the optical interconnect was set up and is described. View full abstract»

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  • Hierarchical QoS Routing in Next Generation Optical Networks

    Page(s): 2129 - 2138
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (643 KB) |  | HTML iconHTML  

    In this paper, we study the problem of inter-domain routing with two additive QoS constraints in hierarchical optical networks. We develop an inter-domain routing protocol that (1) identifies the QoS supported by the paths, (2) selects an inter-domain path that satisfies the QoS requirement of a connection request, and (3) reserves the wavelength on each link along the path in such a way that the number of wavelength converters needed is minimized. Both formal analyses and extensive simulation experiments show that our inter-domain routing protocol outperforms the existing protocols. View full abstract»

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  • High Transmission Enhanced Faraday Rotation in Coupled Resonator Magneto-Optical Waveguides

    Page(s): 2139 - 2145
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (554 KB) |  | HTML iconHTML  

    We propose a novel magneto-optical waveguide configuration consisting of coupled-resonator magneto-optical waveguides to obtain enhanced transmission and Faraday rotation. We show theoretically that such a configuration can enhanced the localization of light and as a result, enhanced Faraday rotation and transmittance simultaneously. The calculations revealed that required optical isolator performance, transmittance 95%, Faraday rotation angle 22.81 degree and large amount of magneto-optical figure of merit, can be fulfilled with our optimized waveguide. Since our investigation showed that the use of optimized one dimensional coupled resonator magneto-optical waveguide with a rotation of half of 45 degree would make it possible to assemble low loss magneto-optical isolators. View full abstract»

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  • Origins of Cross-Phase Modulation Impairments in Optical Transmission Systems Without In-Line Dispersion Compensation

    Page(s): 2146 - 2152
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (199 KB) |  | HTML iconHTML  

    The origins of cross-phase modulation (XPM) impairments in optical transmission systems with wavelength-division multiplexing (WDM) at 10 Gbit/s using intensity modulation are studied. We investigate the impact of a co-propagating signal's predistortion and the impact of the underlying dispersion map separately by using modified pump-probe system setups. We find that the dispersion map mainly determines the system's susceptibility to XPM, whereas an increasing predistortion does not result in higher XPM impairments of the system. View full abstract»

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  • Optoelectronic Mixer Based on Composite Transparent Gate InAlAs–InGaAs Metamorphic HEMTs

    Page(s): 2153 - 2161
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1712 KB) |  | HTML iconHTML  

    In this study, sputtered indium-tin-oxide (ITO) formed ITO/Au/ITO was used to form composite transparent gate InAlAs-InGaAs metamorphic HEMTs (CTG-MHEMT), with an optoelectronic mixer significantly markedly improved front-side optical coupling efficiency. The proposed CTG-MHEMT exhibits a high responsivity (λ = 1310 nm) of 1.71 A/W under optimal bias conditions. A -3 dB electrical bandwidth of 400 MHz is produced by the photovoltaic effect and dominated by the long lifetime of the excess holes. The -3 dB electrical bandwidth associated with the photoconductive effect is 2.3 GHz, and is determined mainly by the short electron life time. A power gain cut-off frequency (fmax) of CTG-MHEMT of 18.2 GHz was achieved. This value, is much larger than that of TG-MHEMT (14.6 GHz) because Au nano particles improved the gate resistance. The optoelectronic mixing efficiency was enhanced by tuning the gate bias conditions. The CTG-MHEMT optoelectronic mixer is a cost-effective device, and based on the optical and electrical characteristics, is a promising candidate for simplifying the system architecture in fiber-optic microwave transmission applications. View full abstract»

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  • Distributed Brillouin Fiber Sensor Assisted by First-Order Raman Amplification

    Page(s): 2162 - 2172
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1886 KB) |  | HTML iconHTML  

    Distributed optical fiber Brillouin sensors provide innovative solutions for the monitoring of temperature and strain in large structures. The effective range of these sensors is typically of the order of 20-30 km, which limits their use in certain applications in which the distance to monitor is larger. In this work, we have developed a new technique to significantly extend the measurement distance of a distributed Brillouin Optical Time-Domain Analysis (BOTDA) sensor. Distributed Raman Amplification in the sensing fiber provides the means to enhance the operating range of the setup. Three Raman pumping configurations are theoretically and experimentally investigated: co-propagating, counter-propagating and bidirectional propagation with respect to the Brillouin pump pulse. We show that some of the amplification schemes tested can extend the measurement range and improve the measurement quality over long distances. View full abstract»

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  • Demonstration of an All-Fiber Broadband Optical Parametric Amplifier at 1 \mu m

    Page(s): 2173 - 2178
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (729 KB) |  | HTML iconHTML  

    In this paper, an optical parametric amplifier and wavelength converter in an all-fiber optical configuration is experimentally demonstrated for photonic applications in the 1 μm band. This is achieved by using a microstructured fiber which provides anomalous dispersion at 1 μm and an LiNbO3 electro-optic intensity modulator specially designed at this operating wavelength for generating pump pulses. A gain of greater than 30 dB together with highly efficient wavelength conversion is obtained at 1053 nm. The gain bandwidth and gain-power efficiency are also investigated. Experimental results agree well with the theory of parametric amplification including Raman scattering. View full abstract»

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  • Analysis of Spectral Bendloss Filtering in a Cladding-Pumped W-Type Fiber Raman Amplifier

    Page(s): 2179 - 2186
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (856 KB) |  | HTML iconHTML  

    We design a double-clad fiber with a W-type core for use in a cladding-pumped fiber Raman amplifier operating at the 1st-Stokes wavelength. Compared to a conventional step-index core, a W-type core allows for a larger inner cladding so that pump sources with relatively poor beam quality can be utilized. This is because parasitic Raman conversion to the 2nd Stokes can be suppressed by bending loss, while the sharp spectral characteristics of a W-type fiber allows the loss to be kept low at the 1st Stokes. Without bendloss filtering, the ratio between the inner-cladding area and the effective area of the Stokes wave is limited to approximately eight. With a bendloss-filtered W-type fiber, area ratios of 34 are possible for core diameters up to around 18 μm and inner-cladding diameters up to around 82 μm. We also discuss limitations on the brightness enhancement due to optical damage and pump-signal walk-off in the pulsed regime. View full abstract»

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  • 21st International conference on optical fiber sensors

    Page(s): 2187 - 2188
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  • Journal of Lightwave Technology Information for authors

    Page(s): C3
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Aims & Scope

The Journal of Lightwave Technology contains articles on current research, applications and methods used in lightwave technology and fiber optics.

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Meet Our Editors

Editor-in-Chief
Peter J. Winzer
Alcatel-Lucent Bell Labs