• Journal of the Korea Institute of Information and Communication Engineering
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• v.22 no.1
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• pp.140-146
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• 2018

Recently, VLC(Visible Light Communication) fusing with LED(Light Emitting Diode) used in indoor lighting and wireless communication technology has attracted attention. However, the VLC can communicate only within the coverage to measure the optical signal and the communication disconnection phenomenon is occur in the NLoS(Non-Line-of-Sight) area. In this paper, we propose VLC relay module to extend the coverage of VLC and improve the communication disconnection phenomenon in NLoS area. The proposed VLC relay module transmits the packet received from the transmitter to the VLC relay module and receiver. The experiment was carried out by installing one VLC transmitter and three VLC relay modules, communication coverage expansion and the improvement of communication disconnection phenomenon in the NLoS were confirmed by the increase of the VLC relay module. Also, we confirmed that the optical signal measurement performance is improved 2.4 times by using the dual sampling method.

• 한국정보통신설비학회:학술대회논문집
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• 2003.08a
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• pp.346-348
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• 2003

본 논문에서는 플라스틱 광섬유용(POF) 광커넥터와 광송수신모듈을 설계. 제작하여 특성을 평가하였다. 650nm와 850nm POF 광커넥터는 광학적, 기계적, 환경적 신뢰성 시험을 통해 안정성을 확증할 수 있었다. POF 광송수신모듈은 1.25Gbps와 155Mbps급의 SC, RJ-45 형태의 구조로 제작되었고, 이를 적용하여 S/W Hub 및 광전 Outlet, Media Converter등을 구현하였다.

• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.31-32
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• 2015

태양광 발전 시스템에서 태양광 모듈 모니터링 시스템은 모듈의 전압, 전류, 온도 등의 정보를 얻는 것을 목적으로 하며 이를 통해 사업자로 하여금 태양광 발전시스템의 유지 및 관리에 큰 도움을 줄 수 있다. 태양광 모듈의 DC 전력선 이용하여 통신하는 DC-PLC(DC - Power Line Communication)는 추가적인 통신선이 필요하지 않아 보다 경제적으로 모니터링 시스템을 구성 할 수 있다. 본 논문에서는 디지털 변조 방식으로 ASK(Amplitude Shift Keying) 방식을 사용하고 디지털 대역통과필터를 통해 캐리어 신호의 검출하는 DC-PLC 기반 태양광 모듈 모니터링 시스템의 설계한다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.7 no.8
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• pp.1816-1822
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• 2003

We propose a novel structure of wavelength selective optical add/drop filter comprising two tap couplers and a fiber Bragg grating. The device has unique features including a simpler structure and a lower cost implementation as compared with existing device for the same operation. The filter performance has been measured and analyzed, experimentally. The implemented prototype filter shows good performance with no­crosstalk power penalty in a 155Mbps per channel wavelength­division­multiplexing transmission system but suffers from a relatively high loss of 3.5㏈ and 21㏈ for transmitted and dropped channel, respectively. While the dropped channel extinction ratio was more than 15㏈, the transmitted channel extinction ratio was more than 26㏈.

• Electronics and Telecommunications Trends
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• v.24 no.1
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• pp.12-23
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• 2009

광트랜시버는 광전송 시스템, 대용량 라우터 및 스위치 등의 광통신 장치에서 전기 신호를 광신호로 바꿔 광섬유를 매체로 송신하며 송신된 광신호를 수신하여 다시 전기 신호로 바꿔주는 광송신과 광수신 기능을 담당하는 모듈을 말한다. 광 송수신 모듈은 초창기 155M, 622M, 2.5 Gb/s SDH/SONET 시스템에 사용되었을 때에는 광송신기와 광수신기가 분리되어 있는 구조였으나, 2000년 이후에 들어서서 광송신기와 수신기가 하나의 패키지 안에 구현된 지금의 광트랜시버 모듈이 등장하였다. 또한, 광트랜시버 모듈 업체를 중심으로 시스템 업체, 부품업체들이 모여 산업체 표준(MSA)을 정하면서 개발 비용과 시간 단축의 효과를 거두는 동시에, 기술면에서도 비약적인 발전을 거듭하고 있다. 이러한 광트랜시버의 발전 방향은 고속화, 소형화, 고성능화, 저가격화로 요약할 수 있다. 본 고에서는 10 Gb/s, 40 Gb/s, 100 Gb/s 광트랜시버를 중심으로 기술동향을 설명하고, 광트랜시버를 개발하는 데 필요한 요소기술에 관하여 살펴본다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2017.05a
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• pp.738-740
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• 2017

Visible light communication is a communication method using light, and it has advantage of ensuring security in a single space as compared with RF communication. However, in the area outside the visible line of the light, communication disconnection occurs. Therefore, this paper proposes a relay module to overcome the coverage extension and communication disconnection phenomenon of visible light communication. The proposed relay module transmits and receives data of visible light communication by sequentially transmitting data packets including target ID through adjacent visible light module. Through experimentation of data transmission, we confirmed the extension of the transmission range and the data reception in the area outside the line of sight.

• The Journal of Korea Institute of Information, Electronics, and Communication Technology
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• v.6 no.1
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• pp.51-56
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• 2013

In this paper, we had design the module of the LED-based media transmission mechanics visible light communication system. To implement the media transmission system through visible light communication transmitter, receiver module the using high brightness, we proposed visible light communication system to implement communication distance of up to a maximum transmitter-receiver distance using a variable PD sensor to the receiver and 1~12 the LED light-emitting device to the transmitter. It was increased efficiency of approximately 20% by measuring the performance during lens wearing or not wearing on the LED module to improve the efficiency of the media transmission system.

• Optical Science and Technology
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• v.6 no.4
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• pp.41-44
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• 2002

정보전달의 매체로서 광만큼 우수한 특성을 보이는 것은 아마 없을 것이다. 이러한 광을 제어하고, 먼 거리까지 광신호를 전달하기 위해서는 광모듈 패키징기술의 발전이 없이는 불가능할 것이다. 패키징기술 개발과 신뢰성시험을 통해 광산업을 주도적으로 이끌어가기 위해 설립된 한국전자통신연구원 광통신부품연구센터을 소개하고, 패키징기술 개발 업무중에서 광학관련 기술과 시험시스템 구축에 관해서 분야별로 소개를 한다.

• The Optical Journal
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• s.175
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• pp.72-76
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• 2019

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.20 no.5
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• pp.157-162
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• 2020

In the existing photovoltaic generation system, the system equipped with the reflecting plate is a method in which solar energy (insolation) is concentrated on the surface of the photovoltaic module. However, the solar energy (insolation) lost by being reflected back through the solar module is not considered. Although a method of increasing the amount of power generated by installing a reflector around the solar modules has been proposed, this affects the power generation degradation caused by the shading of other solar modules. Therefore, in order to improve this problem, in this paper, 1) without affecting the development of photovoltaic module according to the shade, 2) photovoltaic module using a reflector rotating the solar energy (insolation) lost by the solar module Study and suggest how to join again. Therefore, the loss of solar energy (insolation) can be minimized through the method of recycling the solar energy according to the countless reflection angle of the lost solar energy (insolation). As a result, it is possible to increase the amount of power generation of the photovoltaic generation system by maximizing the amount of power generation for the same solar radiation.