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Lightwave Technology, Journal of

Issue 7 • Date April1, 2012

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Displaying Results 1 - 20 of 20
  • [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): 929 - 930
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  • Resonant Fiber Optic Gyroscope Using an Air-Core Fiber

    Page(s): 931 - 937
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (479 KB) |  | HTML iconHTML  

    Air-core photonic bandgap fibers (PBFs) have great potential for the resonant fiber-optic gyroscope (RFOG), because they reduce both the Kerr-induced drift and the thermal polarization instability. We experimentally studied an open-loop RFOG in which a 20-m resonant loop of 7-cell air-core fiber is closed by connecting the air-core fiber to a conventional single-mode fiber directional coupler. We measured a random walk of 0.055 °/s1/2 and a long-term drift with a standard deviation of 0.5° /s and a peak-to-peak variation of 2.5 °/s over 1 hour. We discuss the sources of error in this RFOG and identify areas for future improvement. We project that with straightforward improvements, tactical-grade performance should be possible. View full abstract»

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  • Ferroelectric Liquid Crystal Mixture Integrated Into Optical Waveguides

    Page(s): 938 - 943
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1060 KB) |  | HTML iconHTML  

    We report an on-chip integrated ferroelectric liquid crystal (FLC) waveguide structure suitable for telecommunication applications. Single gaps with different widths of 5, 10, and 20 μ m inside individual silica waveguides were filled with an FLC mixture. The waveguide devices operate as a binary switch or an attenuator in a temperature range from 30 ° C to 60 ° C. The FLC mixture exhibited a good alignment quality in these gaps without alignment layers. A good extinction ratio of up to 33.9 dB and a low insertion loss of <; 4.3 dB at λ = 1550 nm were observed. Switching times of <; 100 μs were obtained for the low electric fields applied in this experiment. View full abstract»

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  • Broadband Mach–Zehnder Switch for Photonic Networks on Chip

    Page(s): 944 - 952
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1328 KB) |  | HTML iconHTML  

    In this paper, we propose a broadband silicon Mach-Zehnder switch (MZS) for wavelength division multiplexing applications on photonic networks on chip. The proposed reconfigurable switch is based on a single-stage three-waveguide interferometric configuration in which the phase shift is achieved via a p-i-n diode. The device is analyzed by the coupled-mode theory and by the finite-difference beam propagation method. The proposed configuration leads to a considerable increase in the bandwidth with respect to the conventional MZS. For example, the two-waveguide MZS with a gap g=0.30 μm between the two coupled waveguides exhibits bandwidth Δλ = 60 nm, crosstalk CT = - 15 dB, and insertion loss IL = 1.1 dB. Conversely, a bandwidth Δλ = 115 nm is achieved for the three-waveguide configuration to parity of the other parameters. View full abstract»

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  • Demonstration of a Remotely Dual-Pumped Long-Reach PON for Flexible Deployment

    Page(s): 953 - 961
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1626 KB) |  | HTML iconHTML  

    We propose and experimentally demonstrate a flexible wavelength division multiplexing/time division multiplexing network architecture for converged metro-access environment. Entire passiveness in the fiber plant is achieved with remote amplification in the signal distribution nodes along the metro ring and in the power splitters of the local access tree. We assist a traditional remote pumping scheme with a distributed pump provided by the optical network units and demonstrate that loss budgets beyond 30 dB can be supported. Data transmission of up to 10 Gb/s is evaluated in different deployment scenarios, reaching from a 78 km long reach rural to a dense 1:128 split/λ urban configuration with field installed fibers, including also worst case resilience configurations. View full abstract»

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  • Auto Bias Control Technique Based on Asymmetric Bias Dithering for Optical QPSK Modulation

    Page(s): 962 - 968
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1200 KB) |  | HTML iconHTML  

    This paper describes a simple and highly sensitive auto bias control (ABC) technique based on asymmetric bias dithering for optical quadrature phase shift keying (QPSK) modulation and QPSK variants. Using our asymmetric bias dithering proposal, the required bandwidth of the ABC circuit is only dc ~ 2fd, where fd is the frequency of dithering, fd <; 1 kHz. Thus, the circuit can be constructed without using high-speed components, and bias control performance is not limited by the signal bit rate. In this paper, we detail the concept of asymmetric bias dithering. We describe experiments that confirm bias monitoring and ABC operation, using a 20-64 Gbit/s optical QPSK signal. Its typical penalty is 0.1 dB, and Q factor fluctuation is negligible over 6 h of operation. View full abstract»

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  • Fabrication of High Glass Transition Temperature Graded-Index Plastic Optical Fiber: Part 2—Fiber Fabrication and Characterizations

    Page(s): 969 - 973
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (633 KB) |  | HTML iconHTML  

    Graded-index plastic optical fiber (GI POF) whose core material consisted of copolymer of 2,2,2-trichloroethyl methacrylate and N-cyclohexyl maleimide, and diphenyl sulfide (DPS) as dopant was fabricated by the dopant diffusion coextrusion process, where poly(methyl methacrylate) and polycarbonate were employed as cladding and overcladding material, respectively. The glass transition temperature Tg of the core material was set to 115 ° C by modifying copolymer composition ratio and DPS content. The attenuation of the copolymer-based GI POF was 132 and 330 dB/km at the wavelengths of 660 and 780 nm, respectively. The bandwidths were 1.7 GHz and over 2 GHz for 774 and 654 nm wavelength, respectively. Due to the high numerical aperture of 0.3, the bending loss of the sample fiber consisting of 250 μm core diameter was ca. 0.03 dB under conditions of 180° , 10 mm radius, one time bending. As a result of heat resistance performance evaluation, the attenuation was preserved for more than 2000 h at 100 ° C. In mechanical property evaluation, the elongation at yield point was ca. 6.7% and tensile load at yield point was 26.2 N (61.0 N/mm2), and sufficient flexibility was confirmed by the kink stress test. From these results, the GI POF can be used as high-speed data transmissible lines in automobiles and aircraft, and interconnections inside electric appliances. View full abstract»

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  • Performance Analysis for Optical OFDM Transmission in Short-Range IM/DD Systems

    Page(s): 974 - 983
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1758 KB) |  | HTML iconHTML  

    This paper investigates the performance of some recently proposed optical orthogonal frequency-division multiplexing (OFDM) transmission techniques in a short-range intensity-modulated, direct-detected (IM/DD) optical channel. Due to the unipolarity of the IM/DD channel, asymmetric clipping and associated nonlinear distortion is inevitable, resulting in an unfavorable dc power and a significant performance penalty. Using a detailed analysis of the clipped signal, our recent work focused on reducing this clipping-resulted dc via both power optimization and frequency planning. In this paper, a set of effective receiver signal-to-noise ratio formulas is proposed, which helps in accurately and efficiently evaluating the system performance across various optical OFDM systems. We conduct a power efficiency analysis to reveal tradeoffs between power and spectral efficiencies among different systems. Our results show that with a cost of additional complexity, a diversity-combining technique offers significant benefits in all cases. View full abstract»

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  • Passively Mode-Locked Fiber Laser Based on Reduced Graphene Oxide on Microfiber for Ultra-Wide-Band Doublet Pulse Generation

    Page(s): 984 - 989
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (735 KB) |  | HTML iconHTML  

    Graphene with zero-band gap can be easily saturated under strong excitation due to Pauli blocking. In this work, the graphene oxide membrane is reduced on the surface of microfiber by use of high temperature heating. Such reduced graphene oxide can interact with the strong evanescent field of the microfiber and enable saturable absorption in passively mode-locked fiber laser. The system can be effectively utilized to directly generate ultra-wide-band doublet pulses for high-capacity wireless communication applications. View full abstract»

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  • Finite Impulse Response Filter Using 4-Port MMI Couplers for Residual Dispersion Compensation

    Page(s): 990 - 996
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1273 KB) |  | HTML iconHTML  

    Many implementations of optical finite impulse response filter for signal processing applications have been realized in integrated photonics using 2×2 couplers. We have implemented a filter using 4× 4 couplers. Such a filter is useful for the compensation of residual dispersion in a fiber optic transmission system. Silicon photonics realization using 4-port multimode interference couplers in 4 μm silicon-on-insulator technology has been carried out for a free spectral range of 100 GHz. The transmission and group delay for the fabricated device have been measured and a good agreement between the simulation and experimental results has been achieved. The proposed filter can compensate up to ±176 ps/nm of fiber chromatic dispersion. View full abstract»

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  • Blank page

    Page(s): 997 - 998
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  • 38th IEEE Photovoltaic Specialists Conference

    Page(s): 999
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  • 2012 Bipolar/Bicmos Circuits and Technology Meeting

    Page(s): 1000
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  • 2012 IEEE International SOI Conference

    Page(s): 1001
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  • Special issue on From 100G to Terabit Optical Networking

    Page(s): 1002
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  • IEEE/OSA Journal of Lightwave Technology

    Page(s): 1003
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  • Journal of Lightwave Technology information for authors

    Page(s): C3
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  • Blank page [back cover]

    Page(s): C4
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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.

Full Aims & Scope

Meet Our Editors

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