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Published: November 20, 2008
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Article type: Index
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Published: November 20, 2008
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Masatoshi Shimizu
Article type: Article
Session ID: BCT2008-101
Published: November 20, 2008
Released on J-STAGE: September 20, 2017
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Construction of optical access network is going on toward realizing ICT-driven society. However, when foreseeing an era of over 20-million optical subscribers, drastic downsizing of optical cables and closures, as well as operation facility, is an important issue. In this paper, I report an outline of a novel optical fiber cable systems, where a bending-loss insensitive fibers (Hall-assisted fiber: HAF) is employed. The operation issue of the cable system is also discussed. We believe that this new optical access cable system is promising particularly for reducing operative cost (OPEX), as well as reducing provisioning cost itself (CAPEX).
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Kazuhide NAKAJIMA, Tomoya SHIMIZU, Chisato FUKAI, Katsumi HIRAMATSU, S ...
Article type: Article
Session ID: BCT2008-102
Published: November 20, 2008
Released on J-STAGE: September 20, 2017
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Optical fibers with improved bending loss characteristics have been developed intensively. A hole assisted fiber (HAF) can realize a superior bending loss characteristics by simply introducing several air holes around the conventional doped core. In this paper, we experimentally investigate the bending loss and cutoff wavelength characteristics of HAF taking into account the filling fraction of air holes. We also propose a novel technique for evaluating the long term reliability under ultra small bending condition. The validity of the proposed technique is successfully clarified experimentally.
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Kazuo Hogari, Yusuke Yamada, Kunihiro Toge
Article type: Article
Session ID: BCT2008-103
Published: November 20, 2008
Released on J-STAGE: September 20, 2017
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This paper proposes ultra-high-density optical fiber cables that use bending loss insensitive optical fibers. These cables have great advantages in terms of cable weight and diameter and will be easy to install in a small space in underground ducts and on residential and business premises. Optimum bending loss insensitive optical fiber is selected experimentally to obtain optical fiber cables with the maximum fiber density. 100-, 200- and 1000-fiber cables were obtained with fiber densities of over 2.6, 2.7 and 5.0 fibers/mm^2 and cable diameters of 7.0, 9.6 and 15.8 mm, respectively. The transmission, mechanical and mid-span access characteristics of these cables were confirmed to be excellent. Moreover, this paper also proposes pre-connectorized optical fiber cable with adjustable excess length using above ultra-high-density optical fiber cables. This cable has a coiled cable part at a cable end that is used to cope with excess cable length after cable installation.
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Shigeru TOMITA, Tetsuya HOSHIJIMA, Ryo KOYAMA, Kotaro SAITO, Yoshiteru ...
Article type: Article
Session ID: BCT2008-104
Published: November 20, 2008
Released on J-STAGE: September 20, 2017
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When we connect HAF(Hole-Assisted Fiber), it is desirable to use a mechanical splice from the view point of economical reasons and easy handling. Therefore, we have clarified factors of excess losses when we connect HAF, and we developed a new mechanical splice using a new index matching material. Characteristics of a new mechanical splice are good in order to be used in the field. We also developed a new optical fibre cables closure which contains HAF from the view point of decreasing number of items and assembling time, in order to utilize a characteristic of HAF that a bending loss is quite low. We have measured assembling time of a newly developed closure, it is found that 25% of the time is reduced.
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Shinichi Aozasa, Shigenori Uruno, Masaki Waki, Yoshitaka Enomoto, Yuji ...
Article type: Article
Session ID: BCT2008-105
Published: November 20, 2008
Released on J-STAGE: September 20, 2017
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Due to spread of optical access service targets the realization of the optical access network with 20 million subscribers by 2010, the importance of optical distribution and management system in central office tends to increase. In this paper, we introduce optical distribution technologies employ Hole Assisted Fiber (HAF) and facilities identification technologies employ RF-ID and LED which can realize reliable and safety.
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Takashi MATSUI, Kunihiro TOGE, Toshio KURASHIMA, Shigeru TOMITA, Masat ...
Article type: Article
Session ID: BCT2008-106
Published: November 20, 2008
Released on J-STAGE: September 20, 2017
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The macro-bending based fiber identification technique is widely used to identify the optical fibers at the worksite. While bending-loss insensitive fibers have been received increasing attention, it is difficult to apply the macro-bending based fiber identification technique to these fibers. In this paper, we propose a new fiber identification technique based on long-period grating technique. We also show that the proposed technique can be utilized for a hole-assisted fiber with an extremely low bending loss.
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Yuji AZUMA, Kuniaki TANAKA, Kohichi YOSHIDA, Kazunori KATAYAMA, Takesh ...
Article type: Article
Session ID: BCT2008-107
Published: November 20, 2008
Released on J-STAGE: September 20, 2017
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The construction of the optical access line transfer is done by temporarily interrupting network service. However, to obtain the consent of all accommodated customers, a lot of time is spent on the adjustment of the schedule. This paper reports on the result of examining the transfer method that avoids service interruption. This method is a technology that installs another temporary route between an optical coupler and an outside optical splitter, matches its distance with main route, and transfers signals data without service interruption.
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Yosuke MIZUNO, Weiwen ZOU, Zuyuan HE, Kazuo HOTATE
Article type: Article
Session ID: BCT2008-108
Published: November 20, 2008
Released on J-STAGE: September 20, 2017
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Recently, we have proposed a Brillouin optical correlation-domain reflectometry (BOCDR) to measure the distribution of strain along an optical fiber from a single end of the fiber, and obtained 13-mm spatial resolution and 50-Hz sampling rate. These resolution, which is directly related to the signal-to-noise (SN) ratio, and sampling rate were limited by the use of an electrical spectrum analyzer (ESA). In this paper, we examine the possibilities of improvements of the SN ratio and the sampling rate as well as a cost reduction with a new BOCDR system based on optical heterodyne detection that uses a single-sideband modulator and fast Fourier transform and contains no ESA. In the experiment, the SN ratio was not as good as that of the conventional BOCDR, but the sampling rate was enhanced to 400 Hz. In addition, noise inherent to this scheme was observed and discussed.
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Huilian MA, Zuyuan HE, Kazuo HOTATE
Article type: Article
Session ID: BCT2008-109
Published: November 20, 2008
Released on J-STAGE: September 20, 2017
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For applications requiring smaller, lighter and robust gyros, waveguide-type optical passive ring resonator gyroscope (OPRG) is a promising candidate. The drift level of OPRQ which is seriously affected by the backscattering induced noise, is limited by the carrier suppression level in phase modulation spectroscopy technique. In this paper, we examine the influence of the carrier suppression level on the gyro performance experimentally. In order to achieve high carrier suppression directly by controlling the peak-to-peak voltage of the sine wave applied to the phase modulator, high precision calibration of the phase modulator is necessary. Suppressed carrier level higher than 50dB has been obtained by controlling the voltage with the accuracy of 1 mV. Proportional integrator (PI) is adopted to eliminate the residual error for the lock-in frequency. A bias stability of 3.1°/s is firstly demonstrated in a silica waveguide ring resonator with the ring length of 7.9cm.
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Masaki YOSHINO, Hideaki UCHIYAMA, Shinichiro HARUYAMA, Masao NAKAGAWA, ...
Article type: Article
Session ID: BCT2008-110
Published: November 20, 2008
Released on J-STAGE: September 20, 2017
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We propose a new measurement system using visible light communication and image sensor. Measurement is a essential technique for building, bridge and tunnel construction and disaster prediction. However, conventional measurement method (like total station, GPS) takes amount of time and trouble. On the other hand, visible light communication utilizing LED lighting equipment is proposed. Visible light communication can receive plural light signals at the same time by using image sensor as receiver. Our proposed system can measure multiple locations at the same time at short times and can be implemented easily. We show the availability of our proposed method by experimental assessment.
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Norio YASUDA, Shinichiro HARUYAMA, Masao NAKAGAWA
Article type: Article
Session ID: BCT2008-111
Published: November 20, 2008
Released on J-STAGE: September 20, 2017
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In this paper, we propose a new optical diffusing system for short range high speed optical wireless communication to transmit large size files instantly when a receiver is positioned near a transmitter. A convex lens and a rectangular acrylic rod and diffuser are used for eye safety and to expand the reception area and to receive signals even when the receiver is leaned. The signal-to-noise ratio (SNR) characteristic of the proposed system is evaluated by experiment. The experimental results show that the sufficient received SNR for the high speed data transmission is obtained by the proposed system even when the receiver is positioned at 5cm from the transmitter and is leaned.
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Masayoshi KANDA, Shinichiro HARUYAMA, Masao NAKAGAWA
Article type: Article
Session ID: BCT2008-112
Published: November 20, 2008
Released on J-STAGE: September 20, 2017
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the organic electroluminescence(OLED) technology attracts attention as display, television and the new lighting equipment. The OLED will appear to the various markets in future. In this paper, we examine possibility of the light wireless communication with the OLED. The light wireless communication is light space communication attracting attention as means of high-speed wireless communication. The OLED which we use for an experiment is a white element for illumination. We examine whether we can use the OLED as optical transmitter. In addition, we examine whether we can use OLED as optical receiver. We assume the light receive process of OLED and show it with our experiment. We show possibility about OLED as the optical transmitter and OLED as the optical receiver from a provided experiment result.
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Masato HIRUTA, SHINICHIRO Haruyama, Masao NAKAGAWA, Shoichi ISHIKAWA
Article type: Article
Session ID: BCT2008-113
Published: November 20, 2008
Released on J-STAGE: September 20, 2017
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In recent years, for the realization of the ubiquitous society, the demand of the information infras-tructure development has been increasing and is no exception in the environment of the moving train. However, considering the current ground-to-train communication systems, these are not enough in point of transmission speed and cannot meet diverse needs of broadband users. In this paper, we propose a new ground-to-train communication system using mobile object tracking technique thinking that can realizes enough transmission speed on the moving train. Based on the practical experiments, we report our proposed system's effectiveness as the new high-speed ground-to-train communication system.
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Kazutoyo KUSAMA, Joji MAEDA
Article type: Article
Session ID: BCT2008-114
Published: November 20, 2008
Released on J-STAGE: September 20, 2017
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Radio over Fiber systems, the carrier frequency of which is beyond microwave band, severely suffer from a fading due to fiber dispersion. In this paper, we experimentally demonstrate the Radio over Fiber transmission of 111.689Mbps BPSK signal with carrier frequency of 10.804GHz, observe the change in an optical waveform along with the transmission, and measure the bit error rate varying the optical transmission power. The transmission over 25km fiber shows a lager power penalty than does the 10km fiber transmission, though by increasing the incident power, we find the decrease in the power penalty because of a parametric gain in the transmission fiber. By calculating modulation indexes from the observed waveforms after transmission, we show that the degradation in the modulation index coincides with the power penalty.
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Toshiaki SHITABA, Satoshi IKEDA, Hisao YOSHINAGA
Article type: Article
Session ID: BCT2008-115
Published: November 20, 2008
Released on J-STAGE: September 20, 2017
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First, the technical outline of the FTTH video distribution system employing super wide band FM conversion scheme put to practical use in NTT is described. Next, the result of examining the design of frequency modulation index of BS/CS-IF signals, the deteriorations of transmission characteristics due to residual FM components, and multiple methods of BS/CS-IF signals to realize expanding transmission bandwidth is described.
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Takeshi KUSAKABE, Takuya KURAKAKE, Kimiyuki OYAMADA
Article type: Article
Session ID: BCT2008-116
Published: November 20, 2008
Released on J-STAGE: September 20, 2017
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For transmission of digital broadcast over FTTH, we have proposed a base-band time-division multiplexing system. We evaluated the cost of transmission equipments using proposed system. Compared with conventional SCM and FM conversion systems, we have found that we could make up a distribution network using the proposed system at lower cost.
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Toshihito FUJIWARA, Koji KIKUSHIMA
Article type: Article
Session ID: BCT2008-117
Published: November 20, 2008
Released on J-STAGE: September 20, 2017
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We propose and demonstrate a transmission system that retransmits 21 GHz satellite broadcasting signals (21GHz RF) with 10G-EPON. Experiments show sufficient performance to satisfy 29dB loss budget.
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Masatoshi YAMAMOTO, Koji KIKUSHIMA
Article type: Article
Session ID: BCT2008-118
Published: November 20, 2008
Released on J-STAGE: September 20, 2017
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We calculated the frequency characteristics and cascade-step-number characteristics of the cascade modulation system that modulates the super-multi-carriers. Distortion and noise value of the cascaded modulation system and traditional single modulation system were calculated. The calculated values were compared on the base of communication satellite, CS, signal standard. Calculation result shows that the properties of cascaded and single modulation system are nearly equal. Therefore, we can say that the cascaded modulation system is superior to the traditional single modulation scheme, because the cascaded modulation system has better network flexibility.
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Kyosuke AKITA, Koji KIKUSHIMA
Article type: Article
Session ID: BCT2008-119
Published: November 20, 2008
Released on J-STAGE: September 20, 2017
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This paper describes the properties of an optical modulator that uses three-step cascade modulation scheme for multi-channel signal modulation. First, the paper examines computer simulations of the value and distribution of distortion. Next, distortion and carrier-to-noise characteristics were calculated for the frequency of new signal set between from 13GHz to 35GHz. The calculation clarified that it was possible to conform with the standard when the frequency of new signal was more than 25GHz.
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Masaaki KAWASE
Article type: Article
Session ID: BCT2008-120
Published: November 20, 2008
Released on J-STAGE: September 20, 2017
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In this presentation, we report high density SM optical fiber ribbon cable and jointing technologies for FTTH networks. We have developed a 1000-fiber cable composed of 8-fiber ribbons, a mass fusion splicing technique and a. multi-fiber connector. Further, we have also developed a new maintenance system for optical fiber network with maintenance-free water blocking cables. Using these technologies, we have realized an FTTH system with a highly reliable and economical infrastructure.
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Takashi Matsuo, Daishi Sakakibara, Kenji Kawashima, Yukio Nakamura, Ma ...
Article type: Article
Session ID: BCT2008-121
Published: November 20, 2008
Released on J-STAGE: September 20, 2017
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We showed that wind pressure load on SZ spiral cable is less than on straight cable by Computational Fluid Dynamics (CFD) simulation. Moreover, we optimized parameters such as slit length. We performed a wind tunnel experiment, and got the results that wind pressure load on SZ spiral type is 45% less than on straight type.
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Xinyu FAN, Yusuke KOSHIKIYA, Fumihiko ITO
Article type: Article
Session ID: BCT2008-122
Published: November 20, 2008
Released on J-STAGE: September 20, 2017
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Polarization mode dispersion (PMD) is now becoming the ultimate limit for system performances in optical communication systems. To replace the bad sections of a link with large PMD, distributed measurement technique is highly required. Polarization optical time domain reflectometry (P-OTDR) is an effective technique which enables us to obtain the information of backscattered states of polarization (SOP) along optical fibers, providing a method of estimating localized PMD However, if the fiber under test has a high-PMD section, the spatial resolution of P-OTDR is insufficient in some cases. In contrast, we proposed the phase-noise compensated optical frequency domain reflectometry (PNC-OFDR), which provides a high spatial resolution and a long measurement range. In this paper, we use PNC-OFDR with a polarization diversity scheme to measure the distributed information of backscattered polarization state including the phase information (Stokes parameter), which makes it possible to measure a high-PMD section.
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Kazuho OHARA, Yukio HORIUCHI
Article type: Article
Session ID: BCT2008-123
Published: November 20, 2008
Released on J-STAGE: September 20, 2017
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A new PON protection architecture has been proposed. In this architecture, two PON systems are combined with optical splitters and optical switches as such that one OLT can accommodate all of ONUs when failure occurs at the other OLT. This paper also has reported that our experiments have confirmed the feasibility of the proposed architecture and has reported the fault time.
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Masashi EGUCHI, Yasuhide TSUJI
Article type: Article
Session ID: BCT2008-124
Published: November 20, 2008
Released on J-STAGE: September 20, 2017
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Various approachs for the bending loss evaluations of an absolutely single-polarizationsingle-polarization elliptical-hole core circular-hole holey fiber are applied. In general, an accurate evaluation of the bending loss of an optical fiber with an arbitrary refractive index profile is a cumbersome task, esspecially for holey fibers. Our simulations show that when the bending loss formulas for round fibers are applied to a holey fiber by regarding it as a step-index round fiber having the equivalent refractive index, the definition of the core region is the most crucial issue.
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Tadashi MURAO, Kunimasa SAITOH, Masanori KOSHIBA
Article type: Article
Session ID: BCT2008-125
Published: November 20, 2008
Released on J-STAGE: September 20, 2017
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Solid-core photonic bandgap fibers (SC-PBGFs) have gathered much attention because of its intriguing transmission band properties which can be understood by the theory for ARROW waveguides. In SC-PBGFs, it has been reported experimentally that the centripetal radiation as well as the centrifugal radiation occurs, when the fiber is bent at longer wavelength ranges in the PBG. This anomalous property was explained by considering the existence of the inner radiation caustic, which can not be seen in conventional optical fibers. However, the further analysis is required to understand the detailed properties of bent SC-PBGFs. In this paper, we investigate the bending loss properties for the SC-PBGFs through a full-vector modal solver based on the finite element method (FEM). In particular, we show that the cladding modes which induced by the bend cause the complete or incomplete leaky mode coupling with the core mode. Moreover, we show the structural and wavelength dependence of the bending losses for the SC-PBGFs.
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Ryuichi YOSHIDA, Yukihiro TSUCHIDA, Tadashi MURAO, Kunimasa SAITOH, Ma ...
Article type: Article
Session ID: BCT2008-126
Published: November 20, 2008
Released on J-STAGE: September 20, 2017
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In this work, we propose low polarization-dependent thermo-tunable couplers based on solid-core photonic band-gap fibers (PBGFs) filled with high temperature-dependent liquid. Firstly, by employing a full-vectorial finite element method, the temperature dependence on photonic band-gap and effective indices of the fundamental modes are investigated, and we numerically confirm that thermo-tunable couplers based on solid-core PBGFs can be realized. In addition, by evaluating the structural parameters dependence on coupling length and normalized output power for x- and y-polarized waves, we present a design method for the low polarization-dependent thermo-tunable couplers based on solid-core PBGFs.
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Hirohisa YOKOTA, Hirotomo YASHIMA, Yoh IMAI, Yutaka SASAKI
Article type: Article
Session ID: BCT2008-127
Published: November 20, 2008
Released on J-STAGE: September 20, 2017
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A fused fiber coupler forming with a photonic crystal fiber (PCF) and a single-mode fiber (SMF) as a solution of their connection method was proposed and was theoretically and experimentally investigated. In the theoretical investigation, it was shown that a power transmission from SMF to PCF in SMF-PCF coupler depends on an air hole collapsed elongation ratio and an SMF diameter in the coupler taper. It was also clarified that the power transmission can be maximized by choosing the air hole collapsed elongation ratio and the SMF diameter properly. A prototype of SMF-PCF coupler was fabricated using CO_2 laser irradiation technique. A power transmission from SMF to PCF in the fabricated coupler was -6.2dB.
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Redouane KATOU, Naokatsu YAMAMOTO, Kouichi AKAHANE, Tetsuya KAWANISHI, ...
Article type: Article
Session ID: BCT2008-128
Published: November 20, 2008
Released on J-STAGE: September 20, 2017
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We have fabricated a QD-based wavelength-tunable light source for the 1-μm optical-waveband; a self-seeded InGaAs/GaAs QD FP-LD with a tuning range of 4 THz. The fabricated laser operation was investigated in the transmission over 1km HAF and clear eye-opening patterns were successfully demonstrated with respect to 2.5Gbps for various wavelengths in the 1-μm band.
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Akio KOSAKI
Article type: Article
Session ID: BCT2008-129
Published: November 20, 2008
Released on J-STAGE: September 20, 2017
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Several level of corrosion was added to the messenger wire of twisted zinc-coated steel for the opt-fiber communication, the residual thickness of zinc and section area of steel were measured by using trial manufactured Eddy current testing (ECT) meter, and developed the corroded wire diagnosis method by non-destructive method. Influence of the actual corrosion behavior to ECT signal become clear. Also, the estimation both of the residual thickness of zinc and section area of steel seems to be possible by using the evaluation of X-signal (V) and phase (degree). By obtain the corrosion rate of wire the life-time estimation seems to be possible. The other applicable method by ECT was also introduced.
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Kyoichi ORO, Ikuo YAMASHITA, Yasuhiro TSUTSUMI, Tetsuro YABU, Masaharu ...
Article type: Article
Session ID: BCT2008-130
Published: November 20, 2008
Released on J-STAGE: September 20, 2017
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An indirect measurement technique for Raman gain efficiency distribution along the transmission line based on the OTDR is proposed. Our proposed technique is a novel and simple technique for estimating Raman gain efficiency distribution by utilizing the relationship between Raman gain coefficient and relative-index difference for the GeO_2-doped core fibers. Measurement experiments of Raman gain efficiency are made on the optical transmission line composed of four 3-km long single-mode fibers and our present technique is compared with the technique using a pump light. Furthermore, our technique is applied to the optical fiber cables installed in the field, and their Raman gain efficiency distributions are successfully estimated.
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Kenji YOKOMIZO, Eiji KONDA, Toshiaki OZAWA, Noboru OKADA, Masaru EBISA ...
Article type: Article
Session ID: BCT2008-131
Published: November 20, 2008
Released on J-STAGE: September 20, 2017
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We have developed the optical fiber cable that the disassembly is easy for recycling, and the disassembly technology of optical fiber cable, to promote reduction of an industrial waste discharge and enable material recycling. We report on the study of closed recycling, optical fiber cable manufactured by using the polyethylene reproduction material collected from the optical fiber cable.
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Shun MORIMURA, Masahiro KURONO
Article type: Article
Session ID: BCT2008-132
Published: November 20, 2008
Released on J-STAGE: September 20, 2017
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We propose a new technique as a dew condensation water detection method in optical joint boxes used for connection of OPGWs (OPtical Ground Wires) using Fresnel reflectivity change between refractive indices of air and water at an optical fiber end. Using with an OTDR (Optical Time Domain Reflectometer), the method can be operated for detection to a long span fiber line without electric power supplies. In this paper, also with the basic detection principle, experimental results of dew condensation water detection in a pseudo joint box are described.
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Katsushi IWASHITA
Article type: Article
Session ID: BCT2008-133
Published: November 20, 2008
Released on J-STAGE: September 20, 2017
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Akira Mizutori, Takahiro Koga, Youichi Nishizato, Masafumi Koga, Kunih ...
Article type: Article
Session ID: BCT2008-134
Published: November 20, 2008
Released on J-STAGE: September 20, 2017
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This paper proposes a new optical frequency stabilization technique for L-band laser diodes with modulated side-band light. The second sideband light generated by phase-modulation is locked on a ^<12>C^<16>O Gas absorption line; the original carrier is placed on ITU-T frequency grid. An Allan variance of 10^<-8> was achieved for a period of 7 hours. The optical carrier seeds phase-locked 33-carriers in the L-band by the phase modulation technique.
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Nobuyuki KATAOKA, Naoya WADA, Xu Wang, Cincotti Gabriella, Tetsuya MIY ...
Article type: Article
Session ID: BCT2008-135
Published: November 20, 2008
Released on J-STAGE: September 20, 2017
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In optical code division multiple access (OCDMA) system, different users are assigned with different code by using OCDMA E/D on a single wavelength. It can It has unique features of full asynchronous transmission, low latency access, soft capacity on demand as well as optical layer security. Recently, Hybrid using different types of the encoder/decoder in an OCDMA network, which is expected to significantly improve the system flexibility and performance, has been proposed and demonstrated. In this report, we experimentally demonstrate error-free (BER<10^<-9>) transmission without FEC of full-duplex, asynchronous, 10Gbps × 4user DPSK-OCDMA system on same wavelength using hybrid multi-port and SSFBG en/decoder.
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Hitoyuki TAGAMI, Naoki SUZUKI, Mayumi ISHIKAWA, Seiji KOZAKI
Article type: Article
Session ID: BCT2008-136
Published: November 20, 2008
Released on J-STAGE: September 20, 2017
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We propose a burst-mode CDR (Clock and Data Recovery) with a novel structure, which involves a gated oscillator to generate multi-phase clocks on the basis of oversampling method. The multi-phase clocks locked to incoming pulse edges allows the reduction in the number of the multi-phase clocks by half, however both of the maximum error in decision phase and the tolerance to pulse-width distortion hold those in the CDR with a conventional oversampling structure. The reduction in the number of multi-phase clocks enables the burst-mode CDR for lOGbps optical access systems to be easily designed by the current silicon technology.
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Nazuki HONDA, Massaki INOUE, Noriyuki ARAKI, Yuji AZUMA
Article type: Article
Session ID: BCT2008-137
Published: November 20, 2008
Released on J-STAGE: September 20, 2017
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We proposed a new method for locating a faulty facility with high accuracy that uses absolute location makers with assigned BFSs. We designed the frequency difference of the BFS and the marker length. We also demonstrated that we can measure the location marker fiber with a BOTDR and confirmed that the experimental results agreed with the design. This method is effective for reducing the maintenance costs and improving the service reliability of optical fiber networks.
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Hiroshi MIYANO, Kenichiro OHTSUKA, Daizo NISHIOKA, Keiju OKABE, Yoshik ...
Article type: Article
Session ID: BCT2008-138
Published: November 20, 2008
Released on J-STAGE: September 20, 2017
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For the purpose of constructing more economical FTTH network, we have developed a new 32-fiber aerial distribution cable, named "Free Branch Cable"; (FBC) and Pre-connectorized elastic spiral drop cable. The FBC contains 32 individually sheathed 1-fiber elements. The elements are stranded loosely so as to enable to take out any elements at anywhere. The elastic spiral drop cable has high adjustability of cable length. This attribute is beneficial for drop wiring with both end pre-connectorized cable. In this paper, we introduce such new cables' configurations and propose a new wiring concept with these new cables which can reduce total cost of FTTH deployment.
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Norihisa Takeda, Junji Takeshita, Tetsuyuki Baba, Shoji Matsumoto, Yuk ...
Article type: Article
Session ID: BCT2008-139
Published: November 20, 2008
Released on J-STAGE: September 20, 2017
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In recent years, FTTH has become popular as a broadband network service in Japan. Now, requests to install optical fiber cable to individual apartments will increase due to the rapidly expanding load of media services. In the case of new buildings, we have developed a new easy-installation wiring system. It is composed of the Pre-fabrication cable, and the Fan-out indoor cable. Furthermore, we developed the Outdoor-prefabrication cable specifically to service existing individual apartments wanting the new high-speed cable.
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Article type: Appendix
Pages
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Published: November 20, 2008
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Article type: Appendix
Pages
App2-
Published: November 20, 2008
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Article type: Appendix
Pages
App3-
Published: November 20, 2008
Released on J-STAGE: September 20, 2017
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