ITE Technical Report
Online ISSN : 2424-1970
Print ISSN : 1342-6893
ISSN-L : 1342-6893
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22.21
Displaying 1-10 of 10 articles from this issue
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  • [title in Japanese]
    Article type: Cover
    Pages Cover1-
    Published: March 19, 1998
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.22.21.0_Cover1
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • [title in Japanese]
    Article type: Index
    Pages Toc1-
    Published: March 19, 1998
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.22.21.0_Toc1
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • A Study on Phase Noise Suppression Method for OFDM Receivers
    Noboru TAGA, Takashi SEKI, Makoto SATO, Yuji OHASHI
    Article type: Article
    Pages 1-6
    Published: March 19, 1998
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.22.21.0_1
    CONFERENCE PROCEEDINGS FREE ACCESS
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    An OFDM signal is very sensitive to a carrier phase noise because it consists of thousands of orthogonal subcarriers. There are two effects caused by phase noise in tuner. One is common phase error(CPE) which occurs commonly to all subcarriers, another is the inter carrier interference(ICI) which is caused by a loss of orthogonality among subcarriers. The ICI becomes a serious problem when the low frequency component of phase noise is large, and the number of subcarrier is large as in 8k-OFDM. This paper describes a new phase noise suppression method which reduces the ICI very effectively. The experimental results shows that the proposed method improves BER remarkably under the carrier phase noise circumstance.
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  • DQPSK Coherent Optical Demodulation Experiment with Phase Diversity
    Mikio Maeda, Hiroyuki Furuta, Masao Yamamoto, Kimiyuki Oyamada, Noboru ...
    Article type: Article
    Pages 7-12
    Published: March 19, 1998
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.22.21.0_7
    CONFERENCE PROCEEDINGS FREE ACCESS
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    A phase-diversity technique is a viable way to achieve wideband TV program transmission systems with closely-arranged optical signals in broadcasting stations. This report describes the first DQPSK coherent detection using phase diversity. An excellent BER of 10 ^<-11> was achieved with received optical power of -27dBm at 2.97Gbit/s that corresponds to the transmitting rate of two channels of the uncompressed digitalized HDTV signal. Optical intensity modulation with a microwave subcarrier is a key technology that can realize QPSK coherent detection easier than the direct optical phase modulation technology so far proposed.
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  • Transmission Characteristics of Data Multiplexed in Low Frequency Region of HDTV Signal
    Yosuke Endo, Makoto Yamamoto, Kimiyuki Oyamada
    Article type: Article
    Pages 13-18
    Published: March 19, 1998
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.22.21.0_13
    CONFERENCE PROCEEDINGS FREE ACCESS
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    This report describes a new transmission method of low-bit-rate data, which is useful for managing the optical video-routing network in a broadcast station. The data is modulated and multiplexed in low-frequency region of an HDTV signal band. We discussed the influence of HDTV signal on the performance of the data transmission. This method is effective when the HDTV signal is re-scrambled. The optical modulation index of the data should be 4.0% in order to achieve 10^<-4> of bit-error rate.
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  • Architectures of WDM ring networks
    Naohide NAGATSU
    Article type: Article
    Pages 19-24
    Published: March 19, 1998
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.22.21.0_19
    CONFERENCE PROCEEDINGS FREE ACCESS
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    Ring networks that employ WDM technologies will be a key application among various transport network applications to support future high-speed multi-media services. This paper categorizes WDM ring networks as per the optical channel schemes and ring architectures such as uni-directional/bi directional and 2-fiber/4-fiber ring. The protection architecture and network supervisioning capability are taken into consideration for comparison among different types of ring. The multiple fiber ring architectures and their node architecture are also presented. Finally application range for each type of ring are presented.
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  • Optical Access Network System Using Partial Response
    Fumitada DOI, Yoshitomo FUJITA, Tetsuya MIKI
    Article type: Article
    Pages 25-30
    Published: March 19, 1998
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.22.21.0_25
    CONFERENCE PROCEEDINGS FREE ACCESS
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    Target system for this study is an optical access network system with the combination of an optical fiber and an existing twist pair cable. The key technology in this system is a partial response over twist pair cable, which enables low cost and highly efficient transmission of high speed digital signals for multimedia telecommunications.
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  • Fiber-Optic Transmission Experiment of 60GHz-Band Millimeter-Wave Downlink using an External Modulation
    Toshiaki KURI, Ken-ichi KITAYAMA, Yasunori OGAWA, Andreas STOHR
    Article type: Article
    Pages 31-36
    Published: March 19, 1998
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.22.21.0_31
    CONFERENCE PROCEEDINGS FREE ACCESS
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    In this paper, a fiber-optic 60GHz-band millimeter(mm)-wave downlink system using external modulation technique is investigated. We prepared the fiber-optic 60GHz-band mm-wave downlink testbed which consists of a control station, a standard single-mode fiber (SMF), a base station and a wireless terminal. To modulate the laser output with 60GHz-band mm-wave signals directly, a specially designed electro-absorption (EA) modulator which works with high-efficiency at around 60GHz is used in our system. Using the downlink testbed, the influence of the fiber dispersion which has never been reported for over 50GHz is experimentally verified. Moreover, the transmission of 156Mb/s-DPSK 60GHz-band subcarrier multiplexed signals over the standard SMF is successfully demonstrated, using an optical single side band filtering technique to overcome the fiber dispersion. As a result, we will show that our system is going on a realizable system.
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  • Simulation of the characteristics of external cavity lasers using fiber gratings
    Manabu Shiozaki, Masahiro Takagi, Takashi Kato, Goro Sasaki
    Article type: Article
    Pages 37-42
    Published: March 19, 1998
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.22.21.0_37
    CONFERENCE PROCEEDINGS FREE ACCESS
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    The external cavity lasers using fiber gratings are expected to be useful as the light source in WDM systems, because of their high selectivity of lasing wavelength. But it is pointed out that these lasers are unstable by the mode hopping when the temperature is changing. In this paper, we simulated the mode hopping characteristics of these lasers, by the combination of the resonance analysis considering the reflection profile of fiber gratings and rate equations. Good agreement between calculated and experimental results were obtained, so the applicability of the simulation methods were confirmed. Moreover we revealed the relationship between the structure of the lasers and the temperature dependence of the lasing character, considering thermal shift of wavelength and gain difference between main mode and side mode.
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  • [title in Japanese]
    Article type: Appendix
    Pages App1-
    Published: March 19, 1998
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.22.21.0_App1
    CONFERENCE PROCEEDINGS FREE ACCESS
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