The Review of Laser Engineering
Online ISSN : 1349-6603
Print ISSN : 0387-0200
ISSN-L : 0387-0200
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Volume 29, Issue 9
Displaying 1-11 of 11 articles from this issue
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  • An Epoch of an Research Institute
    Yoshiro OWADANO
    2001 Volume 29 Issue 9 Pages 575
    Published: September 15, 2001
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.29.575
    JOURNAL FREE ACCESS
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  • Preface for Special Issue on Optical Fiber Amplifiers for WDM Transmission
    Noriaki ONODERA
    2001 Volume 29 Issue 9 Pages 576
    Published: September 15, 2001
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.29.576
    JOURNAL FREE ACCESS
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  • Er3+-Doped Tellurite Fiber Amplifiers
    Atsushi MORI
    2001 Volume 29 Issue 9 Pages 577-581
    Published: September 15, 2001
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.29.577
    JOURNAL FREE ACCESS
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    This paper reports recent progress on broadband Er3+-doped tellurite fiber amplifiers (EDTFA) and discusses their future prospects. The spectroscopic properties of Er3+ in tellurite glasses are comparedwith those of silica and fluoride glasses and then EDTF module fabrication is described. This paper also describes broadband gain-flattened EDTFAs operating in the C plus L-band and L-band and outlines their application to ultrahigh-capacity WDM networks.
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  • Gain-Shifted Thulium-Doped Fiber Amplifier
    Tadashi KASAMATSU
    2001 Volume 29 Issue 9 Pages 582-589
    Published: September 15, 2001
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.29.582
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    The growing need for increases in the transmission capacity of optical communications has driven research efforts of broadband fiber amplifiers that can fully exploit the low-loss region of silica fibers (1450-1650 nm, <0.25dB/km). The so-called S-band (1480-1530nm) is becoming more promising as a candidate for the next-generation transmission band. By using 1.05- and 1.56-?Em dual-wavelength pumping, we first demonstrated a gain-shifted thulium-doped fiber amplifier (GS-TDFA) operating at the S-band. We have then demonstrated a highly-efficient (29%) and high-power (+21.5dBm) GS-TDFA by use of practical laser-diode pumping of 1.4 and 1.56?Em. With the GS-TDFA, a record 10.92-Tb/s capacity WDM transmission has recently been demonstrated. In this paper, we review these recent results by starting from thebasic operational concept of gain shifting. Amplification and transmission characteristics confirm the applicability of GS-TDFAs to large-capacity field-use WDM networks.
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  • [title in Japanese]
    2001 Volume 29 Issue 9 Pages 589-589,593
    Published: September 15, 2001
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.29.589
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  • Bismuth Based Erbium Doped Fiber for WDM Amplifiers
    Naoki SUGIMOTO
    2001 Volume 29 Issue 9 Pages 590-593
    Published: September 15, 2001
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.29.590
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    We fabricated bismuth based erbium doped fiber (Bi-EDF) with Er concentration of 6, 500 ppm andevaluated amplifying performance. A net gain of 18 dB was achieved at 1560 nm using only 22 cm-long Bi-EDF. And we can also obtain more than 9 dB gain in C+L band using this fiber. The maximum saturation output power at the wavelength from 1530 to 1610 nm was estimated to be approximately 13 dBm. Moreover, Bi-EDF can be fusion spliced to SiO2 fiber using a conventional splicing machine.
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  • Fiber Raman Amplifiers
    Yoshihiro EMORI, Shu NAMIKI
    2001 Volume 29 Issue 9 Pages 594-598
    Published: September 15, 2001
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.29.594
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    This paper reviews recent progress in broadband Raman amplifiers for WDM applications. After discussing the fundamentals of Raman amplifiers, basic characteristics of multi-wavelength pumped Raman amplifiers are presented. The design procedure of multi-wavelength pumped Raman amplifiers is summarizedwith respect to the pumping wavelength and power allocation, which are explained by superposition rule and pumpto-pump energy transfer, respectively. The comparison between simulated and experimental results is presented to illustrate the validity of the procedure. The design and demonstration of outstanding performances such as 100nm of flat gain bandwidth and 0.1dB flatness over 80nm are also presented.
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  • Coherent Optical Amplifier
    Atsushi TAKADA, Wataru IMAJUKU
    2001 Volume 29 Issue 9 Pages 599-604
    Published: September 15, 2001
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.29.599
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    Coherent optical amplifiers intensify the amplitude of the component which has a given optical phase and attenuate the amplitude of the component which has the optical phase orthogonal to the 'amplified phase'. Principles, effectiveness in the optical transmission and current status of experimental demonstrations of the coherent amplifiers are reviewed.
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  • Singlet Oxygen Generator for a Discharge Pumped Oxygen-Iodine Laser
    Hiroo FUJII, Yoshihumi KIHARA, Eiji YOSHITANI, Josef SCHMIEDBERGER
    2001 Volume 29 Issue 9 Pages 605-609
    Published: September 15, 2001
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.29.605
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    High efficient singlet oxygen generator for a discharge pumped oxygen-iodine laser was developed. The discharge under conditions of a radio-frequency 100 MHz and an input power of 200 W was done in various gas mixing conditions. The best result was obtained when O2 and N2 were supplied to the generator before a discharge nozzle, and NO and NO2 were put into afterglow plasma region after the nozzle. The O2 (a1Δ) relative yield of 41.0 % was achieved in the case of O2: N2/NO: NO2=250: 50/100: 100 sccm atthe pressure of 0.3 Torr. Moreover, the O2 increase by the recombination of O atoms that caused by the dissociation of NO and NO2 under the discharge was small when both gases were put after the dischargenozzle.
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  • Optical System for Detecting Creases in Polyethylene Sheets
    Fumitaka MURASE, Kazuhiko ISHIKAWA, Katsuhiko ASADA, Toshiaki TANAKA, ...
    2001 Volume 29 Issue 9 Pages 610-612
    Published: September 15, 2001
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.29.610
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    An optical system for detecting creases has been developed. The system consists of a movable sensor head with a pulsed semiconductor laser of 10 kHz and a silicon photodiodes, an analog data processing system including an amplifier with a band-pass-filter, a rectifier and an integrated circuit, and a digital data processing system including an 8 bit A/D converter with a sampling frequency of 1 kHz, a personal computer, and an alarm for crease detection. The detection capability for creases with widths of 2 mm and lengths longer than 3 m was above 95 % for manufacturing plants with production conditions of lm/s and sheets with widths of 1 m.
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  • Fundamentals of Semiconductor Lasers II
    Wataru SUSAKI
    2001 Volume 29 Issue 9 Pages 613-619
    Published: September 15, 2001
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.29.613
    JOURNAL FREE ACCESS
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