• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2002년도 춘계종합학술대회
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• pp.407-410
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• 2002

미국, 독일, 영국 둥 주요 선진국에서는 시내망 경쟁활성화 및 사업자간 중복투자 방지를 위하여 가입자선로 세분화(Local Loop Unbundling: LLU)를 도입하고 있다. 광케이블 개방은 동선 가입자망의 개방과 함께 설비제공 대상의 주요 이슈가 되고 있다. 이 논문에서는 주요국의 광케이블 제공사례를 검토하여 시사점을 도출하고자 한다.

• Current Optics and Photonics
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• 제7권5호
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• pp.511-517
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• 2023

Pipelines play an important role in urban water supply and drainage, oil and gas transmission, etc. This paper presents a technique for pattern recognition of fiber optic vibration signals collected by a distributed vibration sensing (DVS) system using a deep learning residual network (ResNet). The optical fiber is laid on the pipeline, and the signal is collected by the DVS system and converted into a 64 × 64 single-channel grayscale image. The grayscale image is input into the ResNet to extract features, and finally the K-nearest-neighbors (KNN) algorithm is used to achieve the classification and recognition of pipeline damage.

• ETRI Journal
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• 제25권6호
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• pp.531-534
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• 2003

This report describes the effect of optical delay on the suppression of the power transient excursion in a combined gain-controlled erbium-doped fiber amplifier with an internal optical feedback loop (OFL). A simple homogeneous model showed that the optical delay caused a phase change in the oscillation of the surviving and laser channels, which resulted in a reduction of the overall power transient excursion. In addition to the reduction, a real system with a 1528.7-nm OFL shifted the oscillation upward or downward according to channel removal or addition, whereas another one with a 1560.9-nm OFL did not. This different transient behavior reflected a control-wavelength dependence on optical automatic gain control, where spectral-hole burning dominated over relaxation oscillation for 1528.7 nm, and vice versa for 1560.9 nm.

• 한국콘텐츠학회논문지
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• 제6권10호
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• pp.153-162
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• 2006

WDM/SCM FTTH는 가까운 미래에 WDM과 SCM 기술을 사용하여 액세스 네트워크의 다양한 요구 사항들을 충족시킬 수 있는 광 액세스 네트워크이다. 본 논문에서는 WDM FTTH(Fiber To The Home) 및 WDM/SCM (Wavelength Division Multiplexing/Sub-Carrier Multiplexing) FTTH의 새로운 네트워크 구조를 제안하고 네트워크의 광 특성들과 가입자 요구에 의한 대역폭의 동적인 할당에 대한 성능을 시뮬레이션 결과를 통해서 분석한다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1998년도 하계학술대회 논문집 G
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• pp.2464-2466
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• 1998

A switch is a component with two or more ports that selectively transmits, redirects, or blocks optical power in a fiber transmission line. Our switch uses rotation mechanism using stepping motor, hence the common optical fiber can scan and allign to one of the arrayed N optical fibers to provide optical path by electronic precise control. The developed switch is consisted of switching module and its control module. The performance parameters of a switching loss and a repeatability are considered very important. We performed the study to reduce the switching loss and improve the repeatability of switch. The switch can be widely used as a test instrument of optical device and of optical cable in factory, also of optical cable monitoring systems.

• 한국섬유공학회:학술대회논문집
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• 한국섬유공학회 1999년도 가을 한국섬유공학회 학술발표회 논문집(Proceedings of the Korean Textile Conference)
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• pp.279-282
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• 1999

• 섬유기술과 산업
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• 제2권4호
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• pp.520-523
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• 1998

• 한국경영과학회:학술대회논문집
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• 대한산업공학회/한국경영과학회 2006년도 춘계공동학술대회 논문집
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• pp.1641-1646
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• 2006

This paper deals with a physical access network design problem arising from the deployment of fiber-to-the-home passive optical networks (FTTH-PON). The problem seeks to find an optimal location and capacity assignment of splitters in the network such that the total cost of fiber and splitter is minimized, while satisfying all the demand. We propose tabu search approach for finding a good feasible solution.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2001년도 하계종합학술대회 논문집(1)
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• pp.209-212
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• 2001

We Propose a novel structure add/drop multiplexer based on an all-fiber Mach-Zehnder interferometer and fiber Bragg grating. In this structure, wavelength separation is achieved by adjusting the amount of the phase shift in the Mach-Zehnder interferometer. The proposed add/drop multiplexer drops a part of signal at a specific wavelength and transmit the remnant of the signal to the different node separated wavelength in WDM network.

• Journal of Communications and Networks
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• 제12권3호
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• pp.246-252
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• 2010

A binary linear integer program is formulated for the problem of expanding the capacity of a fiber optic network and routing the traffic to deliver new interactive multimedia services. A two-phase Lagrangian dual search procedure and a Lagrangian heuristic are developed. Computational results show superior performance of the two-phase subgradient optimization compared with the conventional one-phase approach.