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Displaying 1-28 of 28 articles from this issue
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Article type: Cover
Pages Cover1-
Published: November 26, 2009
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (14K) -
Article type: Index
Pages Toc1-
Published: November 26, 2009
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (100K) -
Article type: Bibliography
Pages Misc1-
Published: November 26, 2009
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (56K) -
Kei NAKAGAWA, Koji KIKUSHIMAArticle type: Article
Session ID: BCT2009-113
Published: November 26, 2009
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSCascaded Optical Modulation scheme is a system where input laser light is modulated by cascaded external optical modulators one after another. The system can add new data in many places. We examine dropping (removing) channel in Cascaded Optical Modulation scheme with PD, Filter, LD. If the system is realized, we can drop needless data and add new data in the empty channel. In this paper, the necessary electronic filter characteristics to realize the system and the system realization probabilty are reported.View full abstractDownload PDF (544K) -
Yutaro ISHIKURO, Koji KIKUSHIMAArticle type: Article
Session ID: BCT2009-114
Published: November 26, 2009
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSIn this paper, we propose the new optical router system that adds the wavelength conversion ability and the wavelength selection ability to the conventional optical router respectively. The wavelength conversion is made by using optical SSB modulator. The relative intensity noise (RIN) of the new optical router system by the wavelength conversion is calculated. The result shows that the noise level (RIN) of the proposal composition is low, and the proposed system is feasible.View full abstractDownload PDF (682K) -
Masatoshi YAMAMOTO, Koji KIKUSHIMAArticle type: Article
Session ID: BCT2009-115
Published: November 26, 2009
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSUp to now, cascade modulation scheme has been proposed as a optical modulation method. This scheme allows optical modulators to be widely separated. In this paper, distortion and maximum input power to the amplifier dependency on carrier number were calculated for multi-channel CS (communication satellite TV broadcast) compatible video signal modulation by cascaded optical modulation scheme. Calculation shows transmission of 600 carrier satellite video signals by 50 or 100 signal per modulatorView full abstractDownload PDF (565K) -
Yasuhiro KANAOKA, Ikuo YAMASHITA, Satoru KASHIMURA, Satoru SHIMIZUArticle type: Article
Session ID: BCT2009-116
Published: November 26, 2009
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSRadio over fiber technique (ROF) is attractive method for wireless communication. Because the number of wireless equipment can be reduced by dividing and combining of optical signals on the optical fiber and major equipment can be located in a base station. Especially for multi cell system, these features of ROF become effective. However in the case transmission characteristics might be degraded by inter-symbol interference in the area where radio waves come from different remote antennas. In order to obtain stable throughput with whole area, interference reduction scheme is needed. For this purpose we propose multi cell ROF system applying MIMO. Multi path condition is formed in the interference area by allocating two or more of MIMO antenna output to each adjacent RA, and transmission characteristic at the area is improved applying the effect of MIMO transmission. In this report, the transmission characteristic was examined by the outdoor experiment about this method.View full abstractDownload PDF (652K) -
Kensuke IKEDAArticle type: Article
Session ID: BCT2009-117
Published: November 26, 2009
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSTo realize millimeter-wave radio on fiber (RoF) access system, a cost reduction of a central station (CS) is the one of the most important problem to be solved. The CS becomes large and high-cost because a number of RF and optical devices for each BS are needed in general way. We have already proposed a novel system configuration of millimeter-wave RoF access system, to simplify a CS. In the proposal, we adopted wavelength tunable lasers in the CS to switch BS. The switching is realized by changing the wavelength of the light source. In this report, the influences of adjacent wavelength channel interferences are investigated by measuring BERs (bit error rates). We successfully demonstrated that the bit error rates (BER) were below 10-9 in 40 wavelength channels (from 1530nm to 1560nm) without significant quality deterioration.View full abstractDownload PDF (1096K) -
Masaki NODA, Satoshi YOSHIMA, Masamichi NOGAMI, Junichi NAKAGAWAArticle type: Article
Session ID: BCT2009-118
Published: November 26, 2009
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSRapid burst-mode transmitting/receiving techniques are the key technologies enabling the burst-mode upstream transmission of 10G-EPON systems. We have developed a burst-mode ONU transmitter with high launch power DFB-LD of 1.27um wavelength, and a burst-mode OLT receiver including a newly developed preamplifier IC and limiting amplifier IC incorporating continuous AGC/ATC functions to fully compliant with IEEE802.3av 10G-EPON PR30 standards. The transmitting characteristics of a fast LD turn-on/off time of less than 6ns and a high launch power of more than +8.0dBm, and the receiving characteristics of receiver sensitivity of -30.1dBm and the upstream power budget of 38.1dB are successfully achieved.View full abstractDownload PDF (1246K) -
Masato HIRUTA, SHINICHIRO Haruyama, Masao NAKAGAWA, Norio SHIBATA, Hir ...Article type: Article
Session ID: BCT2009-119
Published: November 26, 2009
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSIn recent years, for the realization of the ubiquitous society, the information infrastructure development has been increasing in the environment of the moving train. However, the current ground-to-train communication systems are not enough in point of transmission speed. Optical Wireless Train Communication System using Mobile Object Tracking Technique that we have addressed has used 2 mirrors for X-axis and Y-axis direction independently to control optical beam. But, this conventional system has many problems like the difficuly of control and oscillation of mirror. In this paper, we propose the ground-to-train communication system using biaxial control actuator. Biaxial control actuator is able to move the X-axis and Y-axis direciton concurrently, so can expect the simplification of processing. Moreover, we improve this system by introducing tension structure and miniaturizing the actuator. We report our proposed system's effectiveness by weighing the two systems experimentally.View full abstractDownload PDF (1514K) -
Xin LIN, Syoichi ISHIKAWA, Kazutoshi HIROHASHI, Shinichiro HARUYAMA, M ...Article type: Article
Session ID: BCT2009-120
Published: November 26, 2009
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSA compact infrared communication device with bidirectional directed transmission function is developed as a mobile terminal for an indoor high-speed optical wireless LAN (local area network). In order to realize high-precision control for optical axis of the terminal and miniaturization of the terminal equipment, a spatial omnidirectional control method by one-point support technique to orient the optical axis using a four-quad APD (avalanche photodiode) with high sensitivity and a mirror coil actuator with single axis control is proposed. By using this method, the optical axis point on the four-quad APD can be searched and controlled servo-actionably. We also have implemented this terminal equipment, which has transmission speed of 100Mbps and evaluated its communication quality.View full abstractDownload PDF (747K) -
Shinichiro ITO, Yoshinori MATSUMOTOArticle type: Article
Session ID: BCT2009-121
Published: November 26, 2009
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSVisible light communication have been developed in these years, and a communication method that sends IrDA signal by using visible light is standardized. The purpose of this study is to combine Visible light ID signal and visible IrDA. In this system, visible light LED simultaneously sends these two type signals, then the filtering and reconstruction circuit separate each signal at the receiver.View full abstractDownload PDF (819K) -
Keiji OKAMOTO, Fumihiko ITOArticle type: Article
Session ID: BCT2009-122
Published: November 26, 2009
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSThe techniques for the measurement of polarization mode dispersion (PMD) are of growing importance as fiber-optic communication systems progress toward higher-speed and larger-capacity. Time-domain waveform analysis such as eye-pattern is commonly used for evaluating the quality of optical signals. Simultaneously performing these analytical operations would make it possible to identify the impact of the PMD on the transmitted signal while monitoring its deteriorated waveform. We present here a newly-developed xy-field sampling technique, based on the linear optical sampling, that can completely characterize the PMD vector including high-order components while simultaneously monitoring the eye diagram of the ultrafast signals.View full abstractDownload PDF (851K) -
Tatsuya KOSAKA, Koji KIKUSHIMAArticle type: Article
Session ID: BCT2009-123
Published: November 26, 2009
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSWe calculated the optical loss and the cost of 1x16xN optical access network which is able to be constructed. The calculation results show that, for example, 1x16x8 branch is able to be constructed up to total distance about 2km. It shows feasibility of secondary branch. To evaluate this network system, we calculated the amount of the cost reduction and the transmission capacity per customer for 1x16xN branch. The calculation results show that the cost reduction of several ten billion yen by the secondary branch. In addition, we confirmed the enough transmission capacity for the customer.View full abstractDownload PDF (604K) -
Akira AGATA, Masayuki OISHI, Yukio HORIUCHIArticle type: Article
Session ID: BCT2009-124
Published: November 26, 2009
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSA passive optical network (PON) outside plant, which shares one optical fiber with multiple subscribers by using a power splitter, is being deployed as an infrastructure for the fiber-to-the-home (FTTH) systems. One of the main focuses for PON network planning is to determine the optical cable route of a point-to-multipoint network that connects every subscriber to the central offices (COs) through the power splitter(s) within a limited deployment cost under realistic restrictions, such as possible fiber paths, the splitting ratio of optical splitters and locations, when the locations of COs and subscribers are given. In this paper, we propose a novel suboptimal design algorithm for PON outside plant deployment. Under the realistic restrictions, the algorithm can automatically generate a suboptimal PON network that connects every subscriber to the COs in terms of total fiber length.View full abstractDownload PDF (860K) -
Shun MORIMURAArticle type: Article
Session ID: BCT2009-125
Published: November 26, 2009
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSThe author has been proposed an automatic chromatic dispersion compensation method that can be constructed at low cost for future photonic networks. Measuring time domain characteristics of high-speed transmission signals is not neccessary on the method, but a signal power in a certain bandwidth of frequency spectrum is measured, and only the value is applied to feedback control. Therefore expensive measuring equipments are unnecessary, the system is able to be realized very easily. In this paper, spectrum change of optical signals along with long fiber transmission is analized by numerical simulation, and feasibility of the proposed method is described. In addition, simple comparison between basic experiments and numerical analysis results is made.View full abstractDownload PDF (937K) -
Kyosuke YAGURA, Hiroshi NARUSEArticle type: Article
Session ID: BCT2009-126
Published: November 26, 2009
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSA method is proposed for improving the spatial resolution of a distributed fiber optic strain measurement based on Brillouin scattering, using a Wiener filter, and the measurement characteristics are investigated by simulation. With this method, the scattered light powers (SLPs) within a fiber section that corresponds to the improved spatial resolution are calculated by applying a Wiener filter to the SLPs observed in the longitudinal direction of the fiber at each measurement frequency. The center frequency of the spectrum is then obtained from the SLP calculated at the same measurement distance. Simulations clarified that the increase of the center frequency leading part could be improved from two to six times compared with the conventional method, due to calculation of the center frequency from the observed power spectrum when changed to a rectangular shape.View full abstractDownload PDF (627K) -
Hisaaki NAKANE, Daisuke KAKUTA, Tomoya YAMAMOTO, Shigekatsu TETSUTANI, ...Article type: Article
Session ID: BCT2009-127
Published: November 26, 2009
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSIn order to increase the number of fibers accommodated in a conduit, we have developed a small diameter 1000-fiber underground optical cable. This cable has a small diameter slotted rod and incorporates bending-loss insensitive fiber and thin ribbon. We have also optimized the size of the inner pipe to allow us to install two new 1000-fiber cables additionally. These techniques make it possible to install more fibers in a conduit, and contribute to the effective use of underground facilities.View full abstractDownload PDF (869K) -
Yutaka HOSHINO, Masayoshi TSUKAMOTO, Noboru OKADAArticle type: Article
Session ID: BCT2009-128
Published: November 26, 2009
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSWe developed the optical cable for installation which had both functions of drop cable and indoor cable by contain indoor cable for wiring in house. It is superior to tensile strength without the problem in a beautiful sight and could be superior to execution characteristics even if we wired directly a optical drop cable in house. We confirmed to show a good characteristic in general characteristic evaluation.View full abstractDownload PDF (586K) -
Tadayoshi Sayama, Satoru Shiobara, Daiki Takeda, Katsuyoshi Endo, Naok ...Article type: Article
Session ID: BCT2009-129
Published: November 26, 2009
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSInside the well of liquid natural gas fields, the temperature and the pressure of depth direction have been measured to improve the gas productivity. Until recently, the gas manufacturer measured the temperature and the pressure periodically at certain depth by electric sensor. However, sometimes the temperature and the pressure fluctuate periodically, since then there has been a demand to measure the whole well at once. Recently, the technology for detecting the strain and the temperature distribution using fiber sensor is studied. The temperature distribution can be measured, but the pressure distribution can not be measured yet. As a solution, we developed distributed pressure optical sensor cable which has optical fiber stranded around the substrate to measure compressive strain with BOTDA (Brillouin Optical Time Domain Analysis).View full abstractDownload PDF (619K) -
Kenichi NAKAZAWA, Tsunekazu WATANABE, Yoshitaka ENOMOTO, Wataru KURATA ...Article type: Article
Session ID: BCT2009-130
Published: November 26, 2009
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSThis paper describes new water sensor modules for detecting underground closures that water has penetrated. We evaluated the prototype bending module and marker module, and confirmed the application of detection. A bending module that controlled bending loss can detect two or more underground closures that water has penetrated. A marker module easily identifies underground closure that water has penetrated.View full abstractDownload PDF (907K) -
Katsuhiro TAKENAGA, Shoji TANIGAWA, Shoichiro MATSUO, Munehisa FUJIMAK ...Article type: Article
Session ID: BCT2009-131
Published: November 26, 2009
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSIn the near future, fibers will be used in optical communication systems under high power conditions. Under high power condition, fiber fuse will pose a real danger to the systems. If once the fiber fuse occurred, the core region of a fiber is destroyed catastrophically by optical discharge and the damage propagates along the fiber toward a light source. It is very important to evaluate the characteristics of fiber fuses under the high power conditions. In this paper, we measured the threshold power of fiber fuse propagation in various fibers.View full abstractDownload PDF (933K) -
Katsunori IMAMURA, Kazunori MUKASA, Takeshi YAGIArticle type: Article
Session ID: BCT2009-132
Published: November 26, 2009
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSHoley fibers suitable for wide band transmission system were numerically studied. By taking the relation between the macro bending loss and the confinement loss into account, the usable transmission band have been clarified. Additionally, the viscosity profile controlled holey fiber utilizing the chlorine doped capillaries was fabricated and the reduction of imperfection and defect losses by relaxation of residual stresses in the core region was confirmed.View full abstractDownload PDF (694K) -
Masaaki Hirano, Shinjirou Hagihara, Fumiyoshi Ohkubo, Yasushi Koyano, ...Article type: Article
Session ID: BCT2009-133
Published: November 26, 2009
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSWe report low insertion loss dispersion compensating fiber (DCF) module for compensating accumulated dispersion at 1.55μm-band in transmission system using 1.3μm standard single mode fiber (SSMF). With employing an appropriate profile to maximize figure-of-merit that indicates the degree of low insertion loss, newly fabricated DCF realizes the record high figure-of-merit of 450ps/nm/dB as well as low residual dispersion within ±0.08ps/nm/km in the C-band (1530-1565nm). Using this DCF, we also fabricate DCF modules and confirm their reliabilities and disabilities. The fabricated DCF module for 80km-long SSMF shows high performances of insertion loss as low as 3.6dB and PMD as low as 0.14ps.View full abstractDownload PDF (582K) -
Shiro RYU, Mikio YAGIArticle type: Article
Session ID: BCT2009-134
Published: November 26, 2009
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSMacrobending loss that occurs at a junction point of optical cables might become harmful to system operation since the loss increases in the long wavelength region for a small bending radius. Hence, it is very important to identify the location of the occurrence point of fiber macrobending. Conventionally, optical time domain reflectometry (OTDR) method with a single wavelength has been used to identify a high loss position. However, the conventional OTDR method is not necessarily sufficient to distinguish between a high splice loss point and a macrobending point. In this paper, we propose a novel identification method of a fiber macrobending point based on the OTDR measurement at two wavelengths, and report the experimental results to verify the methods.View full abstractDownload PDF (800K) -
Article type: Appendix
Pages App1-
Published: November 26, 2009
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (91K) -
Article type: Appendix
Pages App2-
Published: November 26, 2009
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (91K) -
Article type: Appendix
Pages App3-
Published: November 26, 2009
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (91K)
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