• Title/Summary/Keyword: Optical communication line

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A Study on Short-Range Wireless Communication System Development Using LED Based on Power Line Communication (전력선통신기반 LED를 이용한 단거리 무선통신 시스템 개발에 관한 연구)

  • Yun, Ji-Hun;Kim, Yong-Kab
    • The Journal of Korea Institute of Information, Electronics, and Communication Technology
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    • v.3 no.1
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    • pp.19-23
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    • 2010
  • This study is to develop power line communication and short-range wireless communication system using LED. I will create optical receiver and transmitter using LED and optical sensor and connectors for display device and communication in receiver and transmitter were created. Experiment method is to signal and waveform through oscilloscope date from optical sensor after chosen a highly efficient LED. In addition, reception and transmitter of smoothly data using visible light communication program were checked. I will compliment problems through this experiment and constantly study, improve on power loss.

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Searching and Autoalignment Method for Indoor Free-space Optical Communication (실내용 자유 공간 광 통신을 위한 수신단의 위치 탐색 및 자동 링크 정렬 방법)

  • Lee, Kwanyong;Cho, Seung-Rae;Lee, Chang-Hee
    • Korean Journal of Optics and Photonics
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    • v.30 no.6
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    • pp.230-236
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    • 2019
  • We propose and demonstrate a searching and autoalignment method for indoor optical wireless communication, using a cost-effective retroreflective sheet and a microelectromechanical system (MEMS) mirror. We use an extremum-seeking method for a single axis and beam steering with a MEMS mirror to maintain a line of sight (LOS) with the optical link. This autoalignment method shows a receiver sensitivity of -31.87 dBm for a bit rate of 2.5 Gb/s over a 7 m communication link.

A Study on the Characteristic for Abnormal Tension of Overhead Optical Communication Line (가공 광통신선의 이상 장력에 대한 특성 연구)

  • Cho, Hyun-Seob;Han, Kun-Hee
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.9 no.3
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    • pp.658-663
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    • 2008
  • In this study, we estimated the influence of electrical pole by FEM(Finite Element Method) and developed protective system by designing and interpreting protective system for electrical pole and overhead optical communication line when abnormal strength worked on messenger wire. Protective system did not shed messenger wire under wind pressure and discontent load but did assign a part to preventing rupture of electrical pole and disconnection of optical communication line through automatically shed messenger wire over fixed strength. Structure of protective system analysis by FEM and prove property by measuring tensile strength for practical product.

The analysis of planar optical waveguide using transmission line analogy (전송선 이론을 이용한 평면 광 도파관의 전파특성 해석)

  • Kwon, Bum;Park, Yong-Tae;Son, Tae-Ho;Lee, Sang-Seol
    • Proceedings of the KIEE Conference
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    • 1988.07a
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    • pp.457-460
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    • 1988
  • We present here a numerical solution for obtaining propagation characteristics including lossess for various modes of an multi-layered optical waveguide structure. The method is based on transmission line analogy. A comparison with other method shows the our results are accurate and simple.

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A Development and Performance Assessment of On-Line Monitoring System for Optical Fiber Composite Underground Distribution Network using DTS (DTS를 활용한 광복합 지중 배전계통 실시간 감시시스템 개발 및 성능평가)

  • Cho, Jin-Tae;Kim, Ju-Yong;Lee, Hak-Ju;Cho, Hwi-Chang;Choi, Myeong-Ho
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.25 no.6
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    • pp.115-121
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    • 2011
  • Intelligent distribution equipment is inevitable to realize self-healing which is one of smart grid functions in distribution network. Therefore, most of distribution equipment have been developed with self diagnostic sensors. However, it is not effective to construct on-line monitoring system for underground distribution cable because of high cost and low sensitivity. Recently, optical fiber composite cable is being considered for communication and power delivery in order to cope with increasing communication in distribution network. This paper presents the design and performance assessment results of underground cable on-line monitoring system using DTS(Distributed Temperature Sensing) and optical fiber composite underground cable.

Effect of Chaos and Instability of Brillouin-Active Fiber Based on Optical Communication Networks

  • Kim, Yong-Kab
    • The Journal of Korea Institute of Information, Electronics, and Communication Technology
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    • v.6 no.4
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    • pp.272-277
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    • 2013
  • In this paper the effect of instability and chaos in optical fiber networks based on the Internet is described. Nonlinear optical fiber effect especially Brillouin scattering in networks has emerged as the essential means for the construction of active optical devices used for all-optic in-line switching, channel selection, amplification, oscillation in optical communications and a host of other applications. The inherent optical feedback by the back-scattered Stokes wave in optical networks also leads to instabilities in the form of optical chaos. This paradigm of optical chaos in fiber Internet serves as a test for fundamental study of chaos and its suppression and exploitation in practical application in optical fiber communication. This paper attempts to present a survey and some of our research findings on the nature of Brillouin chaotic effect on Internet based optical communication.

Effect of Chaos and Instability of Brillouin-Active Fiber Based on Optical Communication

  • Yeom, Keong-Tae;Kim, Kwan-Kyu;Kim, Ji-Hyoung;Kim, Yong-Kab
    • The Journal of Korea Institute of Information, Electronics, and Communication Technology
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    • v.1 no.1
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    • pp.61-66
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    • 2008
  • In this paper the effect of instability and chaos in optical fiber networks based on the Internet is described. Nonlinear optical fiber effect especially Brillouin scattering in networks has emerged as the essential means for the construction of active optical devices used for all-optic in-line switching, channel selection, amplification, oscillation in optical communications and a host of other applications. The inherent optical feedback by the back-scattered Stokes wave in optical networks also leads to instabilities in the form of optical chaos. This paradigm of optical chaos in fiber Internet serves as a test for fundamental study of chaos and its suppression and exploitation in practical application in optical fiber communication. This paper attempts to present a survey and some of our research findings on the nature of Brillouin chaotic effect on Internet based optical communication.

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Modelling the Mode Behavior of Circular Vertical-Cavity Surface-Emitting Laser

  • Ho, Kwang-Chun
    • International Journal of Internet, Broadcasting and Communication
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    • v.4 no.2
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    • pp.22-27
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    • 2012
  • The design characteristics of circular vertical-cavity surface-emitting lasers are studied by using a newly developed equivalent network. Optical parameters, such as the stop-band or the reflectivity of periodic mirrors and the resonance wavelength, are explored for the design of these structures. To evaluate the differential quantum efficiency and the threshold current density, a transverse resonance condition of modal transmission-line theory is also utilized. This approach dramatically reduces the computational time as well as gives an explicit insight to explore the optical characteristics of circular vertical-cavity surface-emitting lasers (VCSELs).

A study on monitor filter PLC monitor device PON system (PON 시스템 감시 모니터용 PLC 소자)

  • Choi, Young-Bok;Park, Soo-Jin;Koh, Seok-Bong;Lee, Bong-Young
    • 한국정보통신설비학회:학술대회논문집
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    • 2007.08a
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    • pp.22-26
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    • 2007
  • In the fibre to the home (FTTH) era, it is expected that broadband network provisioning will require thousands of optical fibres to be accommodated in a central office for optical access networks. An optical fibre line testing system could be used to reduce maintenance costs and improve service availability depending on the PON's element manager capabilities and the maintenance procedures adopted by the network supplier. When monitoring optical fibres transmitting communication lights, a wavelength of 1625 nm is used for maintenance testing. The splitter installed optical filters allow the communication light to pass but that cut off the test light in the front of optical line terminals (OLTs) and optical network terminals (ONTs). In the economic point of view, We design new planer lightwave circuit splitter embedded filtter and study it optical property.

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Development of a Monitoring Equipment of Current and Potential on Power Transmission Line for 66kV

  • Nisiyama, Eiji;Kuwanami, Kenshi;Kawano, Mitsunori;Matsuda, Toyonori;Oota, I.
    • 제어로봇시스템학회:학술대회논문집
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    • 2003.10a
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    • pp.41-44
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    • 2003
  • We propose portable equipment that monitors current and voltage of high-potential power transmission lines. In the equipment, a current and voltage sensor are attached to an insulator that supports a power transmission line: A clamped to the power line and the detected current signal is transmitted to the ground station by a wireless optical link using transmission line is detected by a high resistance element, zinc oxide (ZnO). That acts as a potential divider between the power line and ground. We make an experimental device for 66kV power line and demonstrate that it can monitor currents proposed equipment is small-sized, light, and inexpensive in comparison with the conventional CT (current transformer) and PT (potential transformer) since it does not require high potential insulators and magnetic cores, further, the equipment is easily installed owing to its small size and its simple structure.

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