• Title/Summary/Keyword: Optical communication

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Vertical Coupling of Polymeric Double-Layered Waveguides Using a Stepped MMI Coupler

  • Lee, Jong-Moo;Ahn, Joon-Tae;Cho, Doo-Hee;Ju, Jung-Jin;Lee, Myung-Hyun;Kim, Kyong-Hon
    • ETRI Journal
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    • v.25 no.2
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    • pp.81-88
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    • 2003
  • We designed a multimode interference (MMI) coupler to use in vertical coupling of double layered polymeric waveguides and analyzed the coupling characteristics by comparing our experimental and simulation results. We found that our proposed new structure, a stepped MMI coupler, is effective in vertical coupling between waveguide layers with a short length of MMI and has a high tolerance for the variation in the structure of an MMI coupler that can be induced as errors in the fabrication process.

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A Study on the Optical communication part Lid glass manufacture technology by high temperature and compression molding (광통신 부품 Lid glass 고온압축성형의 관한 연구)

  • Jang, K.C.;Lee, D.G.;Jang, H.
    • Proceedings of the KSME Conference
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    • pp.1526-1531
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    • 2007
  • Data transmission capacity that is required in 2010 is forecasted that increase by optical communication capacity more than present centuple, and is doing increased demand of optical communication related industry product present. Specially, Lid glass' application that is one of optical communication parts is used in optical communication parts manufacture of Fiber array, Ferrule array, Fanout Black, Silica optical waveguide chip and splitter etc. Also, it is used widely for communication network system, CATV, ATM-PON, FTTH and system. But, Lid glass need much processing times and becomes cause in rising prices of optical communication parts because production cost is expensive. The objectives, of this work is to suggest the micro concave and convex pattern manufacturing technology on borosilicate plate using high temperature and compression molding method. As a result, could developed micro pattern Mold more than 5 pattern, and reduce Lid Glass manufacture cycle time.

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The Moving Object Detecting and Tracking System Using the Difference Images (차영상을 이용한 이동 방향 검출 및 추적 시스템)

  • Moon, Cheol-Hong;Kim, Sung-Oh;Kim, Kap-Sung;Jang, Dong-Young;Roo, Young-Soo
    • Proceedings of the IEEK Conference
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    • pp.421-422
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    • 2006
  • Using the still image through the camera reports which the moving object tracking system. Moving object direction detected to compare the two difference images. And base block set at moving object. Matching area set current difference image. The edge image of prior frame and current frame implement the moving object tracking system to block matching.

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Fabrication of 2.5 Gbps Burst-mode Receiver and its Full Compliance to GPON

  • Lee, Mun-Seob;Lee, Byung-Tak;Kim, Jong-Deog;Lee, Dong-Soo
    • Journal of the Optical Society of Korea
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    • v.12 no.4
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    • pp.355-358
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    • 2008
  • In the current GPON market and standard, the line bit rate requirement is changing from 1.25 Gbps to 2.5 Gbps. We fabricate a 2.5 Gbps burst-mode receiver with commercially available blocks and optimize it with an APD bias control. A burst-mode measurement setup is made for the full compliance test with the GPON standard. The device meets the partially defined 2.5 Gbps specs in the current ITU G.984.2 standard, also, supports 1.25 Gbps specs for the coexistence issue in an access network. The full-compliant measurement values can be used as a guideline for fixing "for further study" specs in the current GPON standard at 2.5 Gbps.

Terabit WDM Optical Transmission System Technology (테라비트급 WDM 광전송시스템 기술)

  • Lee H.J.;Kwon Y.;Joo M.J.;Ko J.S.;Lee J.H.
    • 한국정보통신설비학회:학술대회논문집
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    • pp.135-136
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    • 2002
  • 테라비트급 WDM 광전송시스템은 채널당 10Gb/s의 전송속도를 갖는 채널을 파장분할다중하여 하나의 광섬유로 전송하는 시스템이다. 시스템의 주요 영역으로는 광을 송수신하는 광트랜스폰더, 다채널의 광신호를 다중/역다중 하는 광 다중화기/역다중화기, 광신호를 증폭하기 위한 광증폭기, 그리고 광분기 삽입기 등으로. 구성된다. 우리가 구성하는 테라비트급 WDM 광전송시스템은 구조 변경없이 TM 및 ADM 방식을 수용한다. 시스템의 신뢰성을 위해 종속망 절체 및 광학적 계층에서의 보호절체 방식으로 1+1 OCh 및 1+1 OMS 절체 기능을 선택적으로 수용할 수 있어 시스템 운영에 따라 효율적이고 경제적인 망 운영을 할 수 있다. 감시채널은 시스템 유지보수에 필요한 신호(PMI, FDI, BDI 등) 및 시스템 DCC용으로 되어 있으며, WDM 망에 적합한 감시 체계를 설계하였다.

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Design of optical transmitter system for high-speed wireless optical communication (초고속 무선 광통신을 위한 송신광학계의 설계)

  • 권영훈;임천석
    • Korean Journal of Optics and Photonics
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    • v.15 no.2
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    • pp.158-170
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    • 2004
  • Wireless optical communication is expected for high-speed optical communication in the areas of saturated optical fiber communication and low population density. In this paper, we present an optical transmitter system for wireless optical communication with new design concepts different from the usual optical imaging system. The specifications are the following: the source is a laser diode(LD) of wavelength 830 nm in which the divergent angle from the tangential plane differs from that from the sagittal plane. Here, the requested transmission distances are very long range such as 500 m to 1500 m and beam diameter is 3 m at the receiver with symmetrical energy distribution. For the evaluation characteristics of this kind of non-imaging system, two optical quantities, the relative illumination distribution and energy transfer efficiency, are numerically calculated through lots of ray tracing.

Indoor Wireless Optical Communication Using a Lighting LED and a Solar Cell (조명용 LED와 솔라 셀을 이용한 실내 무선광 통신)

  • Lee, Seong-Ho
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.21 no.3
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    • pp.285-291
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    • 2010
  • In this paper, we demonstrate that indoor wireless optical communication is possible with an LED and a solar cell. A lighting LED is used for lighting and signal transmission. A solar cell is used for collecting light energy and signal detection. This scheme is very useful because transmission is possible without any additional communication systems. In experiments, wireless optical communication was carried out at a data rate of 9.6 kbps using a lighting LED and a solar cell.

Analysis of Laser Diode Equivalent Circuit using Rate Equation (Rate equation을 이용한 광송신용 LD의 등가회로 분석)

  • Kim Do-Kyoon;Yun Young-Sul;Lee Jun-Jea;Choi Young-Wan
    • 한국정보통신설비학회:학술대회논문집
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    • pp.46-49
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    • 2004
  • 레이저 다이오드 (LD)의 광 직접 변조시 광자와 전자의 동역학에 의하여 입출력 관계가 결정된다. 이는 LD의 직접 변조 시 대역폭을 제한하는 요소로 작용한다. 높은 대역폭을 가지는 광송신기 설계를 위하여 LD의 등가회로 분석은 필수적이다. LD의 등가회로는 E/O response를 이용하여 소신호 분석을 통해 얻을 수 있으며, E/O response는 rate equation을 이용하여, 구할 수 있다. LD의 등가회로는 직렬 저항값, 기생 커패시턴스, 외부 회로와의 연결을 위한 와이어에 기인하는 인덕턴스 성분 등으로 구성된다. 본 논문에서는, rate equation을 사용하여 계산된 결과를 이용하여, LD의 등가회로를 도출하였다.

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Measurement technology of performance evaluation of optical collimator with high-functionality (고기능 광콜리메이터 성능평가 측정 기술)

  • Choi, D.S.;Je, T.J.;Hwang, K.H.;Kang, Y.H.
    • Proceedings of the KSME Conference
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    • pp.1355-1360
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    • 2003
  • Currently, product of optical collimator for optical communication is depending on handiwork, and some companies are propelling semi-automatic system composite of manual and automatic operations. In this point of time, the importance of automatic system of optical collimator for optical communication is taking its place as a core technology in the development of parts with high-efficiency of optical communication. In order to develop such an optical collimator in this study, we designed an automatic assembly system, and developed a software for the system operation. At a result of that, we could carry out a single work process individually running processes of collimator fabrication, a constant work process constantly running all of the processes, and performance evaluation of the collimator.

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Economic Analysis of Optical Communication Control System in High Voltage Magnetizer (고전압 착자기에서의 누전 사고 방지를 위한 광통신 제어시스템의 도입 방안과 경제성 분석)

  • Bae, Young Woo;Kim, Wooju;Hong, June Seok
    • Journal of Information Technology Applications and Management
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    • v.26 no.6
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    • pp.103-117
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    • 2019
  • Demand for high power motors is rapidly increasing as the 4th industry and convergence technology has recently emerged. In order to produce high-strength permanent magnets, the magnets used for magnetization have been increased from DC 300V in the 1970s to DC 2.5kV in the 2010s, Up to DC 10kV in the 2030s, It is expected that higher voltage will be used to magnetize. However, in the case of a magnetizer using an existing electric signal control device, it is necessary to use a control device with a high-voltage insulation function in case a high voltage used for magnetization is leaked to the control device. If a short circuit accident occurs, the controller must be shut down and serious problems such as excessive repair costs arise. In this study, a control system adopting optical communication method instead of electric signal control method is proposed to prevent leakage currents in high-voltage magnetizer. We design a transmitter(Tx) and a receiver(Rx) device for the optical communication control device and implemented a prototype connecting the optical cable. In order to demonstrate the utility of high-voltage magnetizer using the optical communication control device, we analyzed the initial cost and the yearly cost for the years to analyze the net present value. As a result, In the case of the low-voltage magnetizer, the electric signal control method cost less, As the operating voltage of the magnetizer becomes higher. It is confirmed that it takes less cost when the optical communication control device is used.