• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 하계학술대회 논문집 D
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• pp.2543-2545
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• 2002

There are many applicable services such as remote metering, load control, distribution line automation, Pole transformer Monitoring having their own networks in the electric power company. The application of the optical network technology as the back-born network to the Automation Systems in KEPCO is potentially beneficial in reliability, speed, and expandability. The 1-core and 2-core optical modems were developed and used by the Distribution Automation System. But, They had some disadvantages and advantages. So, We designed the new optical modems applied each advantages. This paper presents some of design efforts and test results for the multi-channel optical modem at KRPRI.

• Journal of the Optical Society of Korea
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• 제16권2호
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• pp.101-106
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• 2012

We demonstrate a cost effective broadcast signal transmission at 1.25-Gb/s with 100 GHz channel spacing based on a broadband light source (BLS) for a wavelength division multiplexing-passive optical network (WDM-PON). The BLS is implemented by using mutually injected Fabry-Perot laser diodes (MI F-P LDs). The error-free transmission without a forward error correction (FEC) is achieved by its low relative intensity noise (RIN). The number of usable modes is determined by RIN and/or extinction ratio (ER) in the spectrum sliced light output.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2006년도 하계종합학술대회
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• pp.73-74
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• 2006

In this paper, we designed, constructed and evaluated the system for the FTTH suited to a residence and apartment using CWDM-PON techniques. These systems have capacity to service at 100Mbps rate to 384 users in the same breath. Also, the services include the internet, CATV, IPTV and wireless LAN. In the case of wire network, the data could be transmitted by UTP cable and optical fiber and case of wireless one, the data transmitted using WLAN. The distance between the cental office and the user is 20km and the data rate is 100Mbps maximum. Of course, the optical network used just one fiber optical core. For the basic material, we obtained the characteristics of optical transceiver module, Mux/Demux and transmission qualities depends on the environment.

• Journal of the Optical Society of Korea
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• 제9권1호
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• pp.1-5
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• 2005

Using tightly focused femtosecond laser pulses, we produce an optical waveguide and optical devices in transparent materials. This technique has the potential to generate not only channel waveguides, but also three-dimensional optical devices. In this paper, an optical splitter and U-grooves, which are used for fiber alignment, are simultaneously fabricated in a fused silica glass using near-IR femtosecond laser pulses. The fiber aligned optical splitter has a low insertion loss, less than 4㏈, including an intrinsic splitting loss of 3㏈ and excess loss due to the passive alignment of a single-mode fiber. Finally, we demonstrate the utility of the femtosecond laser writing technique by fabricating gratings at the surface and inside the silica glass.

• 한국통신학회논문지
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• 제30권11B호
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• pp.707-721
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• 2005

폭발적으로 증가하는 데이터 트래픽을 수용하기 위해 광 전송망이 핵심적인 해결책으로 부각되고 있으며, 대규모의 광 전달망에서 사용자가 원하는 대역폭의 단대단 연결을 실시간 수준으로 제공하기 위한 제어구조 관련 연구가 요구되고 있다. 이러한 문제 해결을 위해, IETF와 ITU-T에서는 차세대 통합 전달망의 연결 제공 시간을 단축시키기 위한 제어 평면에 대한 연구를 의욕적으로 진행하고 있으며, 그러한 연구들은 기본적으로 분산형 제어체계에 기반하고 있다. 본 연구에서는 집중형 제어 체계가 분산형에 비해 가지고 있는 고유한 장점들을 광 전달망 상에 활용하기 위한 연구로서, 광 전달망의 연결 제어에 대한 집중형 제어 체계의 적용 가능성을 조사하고, 새로운 제어 구조의 형태와 제어 절차를 제안하였다. 또한 제안한 구조에 대한 IETF의 기존 라우팅 프로토콜과 시그널링 프로토콜의 활용 가능성을 검토하고 필요한 보완 부분에 대해 제시하였다.

• 한국정보과학회논문지:정보통신
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• 제36권4호
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• pp.360-368
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• 2009

세계적으로 가입자망의 고도화 및 광대역화가 경쟁적으로 추진되고, 이에 따른 신규 서비스도 활성화되고 있는 추세이다. 국내 광통신 산업의 저변 확대와 육성 발전, 차세대 장비 개발, 광가입자망 기반 고품질 서비스 및 플랫폼 개발의 일환으로, ETRI(Electronics and Telecommunications Research Institute)에서는 자체적으로 FTTH(Fiber-To-the-Home) 표준 BMT(Bench Mark Test) 테스트베드와 네트워크 운영센터 및 IPTV 서비스 장비로 FTTH 서비스센터를 구축하고, 통신망사업자를 통하여 규모 있는 상용 광가입자망을 구축하고 연동하였다. 본 논문에서는 ETRI의 FTTH 서비스센터와 통신사업자의 상용 광가입자망 구축에 사용되는 FTTH E-PON(Ethernet Passive Optical Network) 시스템에 대해 QoS(Qualiy of Service) 기반의 TPS(Triple Play Service)와 QoE(Quality of Experience) 측면에서 시험한 성능 평가 결과를 기술하였다.

• Journal of the Optical Society of Korea
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• 제11권4호
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• pp.149-152
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• 2007

We present a simple and efficient management scheme for gain control of EDFA by using standardized network management protocol(Simple Network Management Protocol) and operating the optical amplifier in a link-control scheme. We have demonstrated the proposed scheme by using SNMP Simulator and optical simulation software package.

• 전자통신동향분석
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• 제35권5호
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• pp.57-68
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• 2020

This paper reviews the recent trends in optical access technologies and their future directions. As the number of hyper-connected, ultra-low-latency, and hyper-realistic services increases, the wireless path has become shorter and the optical access network has become deeply penetrated into the end user. The optical access network continues to evolve through endless innovation via high-speed, ultra-low-latency, and abstraction/virtualization technologies.

• 한국광학회:학술대회논문집
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• 한국광학회 2005년도 제16회 정기총회 및 동계학술발표회
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• pp.162-163
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• 2005

One of the most important things in EPON(Ethernet Passive Optical Network) is that ONUs(Optical Network Units) have to share a channel in upstream direction. We proposed a new algorithm of Dynamic Bandwidth Allocation using Multiple LLID(Logical Link IDentifier). We show how to allocate bandwidth in Queues for improving performance from Bandwidth using Multiple LLID.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2003년도 하계종합학술대회 논문집 I
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• pp.386-389
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• 2003

This paper proposes the architecture of a multiple ring based optical network with single hop between edge nodes using either the concept of circuit switching or multi-wavelength label. The structure of the multi-wavelength label, be shown through the single wavelength-band and the multiple wavelength-band that can reduce number of ring. To avoid the collision of the optical packets at an outward port, we proposed the dynamic allocation scheme of the outward optical packets based on the fiber do]ay lines(FDLs).