The Review of Laser Engineering
Online ISSN : 1349-6603
Print ISSN : 0387-0200
ISSN-L : 0387-0200
Search
Advanced search
OR
Browse
Search
Volume 33, Issue 2
Displaying 1-11 of 11 articles from this issue
Show all abstracts
    • |<
    • <
    • 1
    • >
    • >|
  • Preface to Special Issue on Recent Progress in High Speed Optical Communication Technologies
    Takashi MIZUOCHI
    2005 Volume 33 Issue 2 Pages 82
    Published: February 15, 2005
    Released on J-STAGE: March 26, 2014
    DOIhttps://doi.org/10.2184/lsj.33.82
    JOURNAL FREE ACCESS
    Download PDF (199K)
  • Line Codings for Photonic Transport Network Using Ultra-High-Speed Channels
    Yutaka MIYAMOTO
    2005 Volume 33 Issue 2 Pages 83-88
    Published: February 15, 2005
    Released on J-STAGE: March 26, 2014
    DOIhttps://doi.org/10.2184/lsj.33.83
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    This paper reviews the recent progress in high-speed optical line coding for future photonic transport network. We proposed the novel return-to-zero (RZ) line coding schemes that use carrier-suppressed return-to-zero (CS-RZ) pulse generation in both intensity-modulation and direct detection (IM-DD) system and differential phase shift keying (DPSK) system for the purpose of the modulation bandwidth reduction and the enhancement of fiber-nonlinearity tolerance in the long-haul dense wavelength division multiplexing (DWDM) transmission. The large tolerance of these formats against several fiber non-linearities and their wide dispersion tolerance characteristics are confirmed at the channel rate of 43 Gbit/s with 100 GHz spacing. The novel idea of duobinary modes splitting in DPSK spectral structure are proposed to understand the advantage of novel CS-RZ DPSK format concerning the strong spectral filtering and chromatic dispersion across the photonic transport network.
    View full abstract
    Download PDF (1256K)
  • Adaptive Dispersion Equalization Techniques in High-Speed Optical Fiber Transmission Systems
    Yuichi TAKUSHIMA
    2005 Volume 33 Issue 2 Pages 89-94
    Published: February 15, 2005
    Released on J-STAGE: March 26, 2014
    DOIhttps://doi.org/10.2184/lsj.33.89
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    The group-velocity dispersion (or chromatic dispersion) of fibers for transmission is one of the most crucial issues in high bit-rate transmission systems. As the bit-rate increases, the allowable range of group-velocity dispersion decreases substantially, and hence the bit-error rate performance can be easily perturbed due to the variation of the dispersion. For installation and reliable operation of such systems, the adaptive dispersion equalization, which can measure the accumulated dispersion of transmission systems and compensate for it so as to keep the total dispersion within the dispersion tolerance in real time, is of great importance. In this paper, we explain the adaptive dispersion equalization system and show recent research activities on in-service dispersion monitors and tunable dispersion compensators.
    View full abstract
    Download PDF (1201K)
  • Compensation of Polarization Mode Dispersion for High-Speed Optical Fiber Transmission Systems
    Hiroyuki TODA, Masayuki MATSUMOTO, Daniele ALZETTA
    2005 Volume 33 Issue 2 Pages 95-99
    Published: February 15, 2005
    Released on J-STAGE: March 26, 2014
    DOIhttps://doi.org/10.2184/lsj.33.2_95
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    In optical fiber transmission systems, polarization mode dispersion (PMD), represents a severe source of degradation as the bit rate increases. In this paper, we review PMD compensation techniques performed in optical domain. We also report our experimental results on PMD compensation by distributing linear polarizers along the transmission line. Polarizers are used as PMD compensator elements with only 1 degree-of-freedom (DOF) which result in simple configuration and fast response. Even though the polarizers do not compensate 1 st-order PMD perfectly, Distributed 4 polarizers outperformed a 2-DOF polarizer-based PMD compensator placed at the optical receiver front-end.
    View full abstract
    Download PDF (3870K)
  • Overcoming Fiber Nonlinear Effects in Large Capacity Optical Transmission Systems
    Katsuhiro SHIMIZU, Takashi MIZUOCHI, Kazuyuki ISHIDA, Kuniaki MOTOSHIM ...
    2005 Volume 33 Issue 2 Pages 100-105
    Published: February 15, 2005
    Released on J-STAGE: March 26, 2014
    DOIhttps://doi.org/10.2184/lsj.33.100
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    We have tackled the technical challenge of how to mitigate fiber nonlinearity effects in our high-speed optical communication systems. Over the last decade, we have improved the tolerance to nonlinearity by 30 dB by developing numerous technologies that can be categorized into four types:(1) new design of optical fibers to reduce nonlinearity, (2) transmission and signal amplification technologies that reduce signal power level without optical SNR degradation, (3) dispersion management techniques to reduce the nonlinear interactions, and (4) new modulation formats and forward-error-correction techniques. We believe that a deeper understanding of fiber nonlinearity effects will make it possible to realize more cost effective and transparent optical networks in the near future.
    View full abstract
    Download PDF (1093K)
  • Enabling Technologies for 40 Gbit/s-Based Ultra-Dense WDM Transmission
    Itsuro MORITA
    2005 Volume 33 Issue 2 Pages 106-110
    Published: February 15, 2005
    Released on J-STAGE: March 26, 2014
    DOIhttps://doi.org/10.2184/lsj.33.2_106
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    High spectral efficiency is the key to cost-effective capacity expansion in WDM systems, since it can relax the requirements for the transmission line. This paper reviews enabling technologies to achieve higher spectral efficiency in 40 Gbit/s-based DWDM transmission. As examples of 40 Gbit/s-based highly spectral-efficient WDM transmissions, 100% spectral-efficient transmission with asymmetrically bandlimited CS-RZ signal and 80% spectral-efficient transpacific transmission with bandlimited CS-RZ DPSK signal are described.
    View full abstract
    Download PDF (1088K)
  • 160-GHz Actively Mode-Locked Semiconductor Laser and Its Application to Optical Clock Recovery
    Tetsuichiro OHNO, Kenji SATO, Ryuzo IGA, Yasuhiro KONDO, Kaoru YOSHINO ...
    2005 Volume 33 Issue 2 Pages 111-115
    Published: February 15, 2005
    Released on J-STAGE: March 26, 2014
    DOIhttps://doi.org/10.2184/lsj.33.2_111
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    A 160-GHz optical pulse train was generated by a semiconductor mode-locked laser integrated with a highmesa EA modulator synchronized with 80-GHz electrical signal. The timing jitter is suppressed to about 0.12 ps for RF input powers larger than 10 dBm. Furthermore, a 160-GHz optical clock is recovered from a 160-Gbit/s signal using a similar mode-locked laser diode in a wide wavelength range. The wide locking range was obtained for both lasers due to the integrated chirped distributed Bragg reflector.
    View full abstract
    Download PDF (941K)
  • Optical Switch Architectures for High-Speed and Large-Capacity WDM Networks
    Shoichi HANATANI
    2005 Volume 33 Issue 2 Pages 116-121
    Published: February 15, 2005
    Released on J-STAGE: March 26, 2014
    DOIhttps://doi.org/10.2184/lsj.33.116
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    An optical switch is one of the key elements in advanced high-speed and large-capacity WDM optical transport networks, in particular, to implement protection and restoration functionality in photonic layers. Optical switch architecture technology for protection and restoration is reviewed, focusing coexistence with the installed SONET/SDH system over WDM and in-service scalability from 1:1 to optical rings/meshes as well as low insertion loss and switching speed.
    View full abstract
    Download PDF (4281K)
  • The Detection of Metal Fatigue by Laser-Induced Thermal Vibration
    Akira MORI, Shinichi IWASA, Shigeto KITAMURA, Kaoru SUZUKI
    2005 Volume 33 Issue 2 Pages 122-125
    Published: February 15, 2005
    Released on J-STAGE: March 26, 2014
    DOIhttps://doi.org/10.2184/lsj.33.122
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    A fundamental study of a nondestructive detection method for metal fatigue in sheet materials with simple equipments was performed by using laser-induced thermal vibration. In the experiments, changes in amplitude of laser induced thermal vibration were found around the target portion. This position corresponded to the site where analysis indicated that the stress concentrated. Precise measure ents of the vibrations can be applied to analyze two-dimensional stress distributions. In this paper, we measure the amplitude of vibration on a metal sample by the laser-induced thermal vibration and analyze the stress distribution by finite element method when stress was added to the load. We examine the relation between the site of large amplitude place and concentration of stress.
    View full abstract
    Download PDF (1958K)
  • Enhancement of Conversion Efficiency of Extreme Ultraviolet (EUV) Emission from a Laser-Produced Plasma by Use of Water Jet Target
    Takeshi HIGASHIGUCHI, Chirag RAJYAGURU, Masato KOGA, Wataru SASAKI, Sh ...
    2005 Volume 33 Issue 2 Pages 126-129
    Published: February 15, 2005
    Released on J-STAGE: March 26, 2014
    DOIhttps://doi.org/10.2184/lsj.33.126
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Extreme ultraviolet (EUV) radiation at the wavelength of around 13 nm was observed from a laser-produced plasma using continuous liquid water-jet. The EUV conversion efficiency (CE) was found to depend strongly on the laser focal spot size near the plasma expansion diameter. The maximum EUV CE was observed to be 0.38%/2π sr at 13.0nm in 2% bandwidth.
    View full abstract
    Download PDF (641K)
  • 1.52-W Frequency-Doubled Fiber-Based Continuous Wave Orange Laser Radiation at 590nm
    Lalit Bhushan SHARMA
    2005 Volume 33 Issue 2 Pages 130-131
    Published: February 15, 2005
    Released on J-STAGE: March 26, 2014
    DOIhttps://doi.org/10.2184/lsj.33.130
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Generation of cw orange laser radiation at 590-nm by single-pass frequency doubling of 1180-nm high-power Raman fiber laser in a 20-mm long bulk periodically poled MgO doped lithium niobate (PP-MgO: LN) crystal is presented. A maximum cw orange output power of 1.52 W with conversion efficiency of 7.7 % and the power stability of±1.3% over a two-hour period has been achieved.
    View full abstract
    Download PDF (397K)
    • |<
    • <
    • 1
    • >
    • >|
feedback
 Top