• Photonics industry news
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• s.33
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• pp.34-41
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• 2006

광통신은 인터넷 이용자의 증가와 디지털기술 발전에 의한 화상정보 활용의 보편화, 전자 상거래, 양방향 TV등 전송 데이터가 폭증하는 정보화 사회의 필수적인 기술이다. 이는 광섬유 한 가닥의 정보전달 능력이 수십 Gbps이며 전자파 장애에 의한 누화나 잡음이 없고 수명이 길다는 장점이 있기 때문이다.

• Proceedings of the KAIS Fall Conference
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• 2011.05a
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• pp.198-200
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• 2011

단일모드 광섬유에서 박막도파로로 효율적인 광신호의 전송은 집적광학에서 해결해야 할 중요한 문제이다. 본 연구에서는 필드 프로필의 불일치를 피하고, 높은 광 결합 효율을 갖을 수 있는 광섬유-박마도파로 결합구조를 제안하였다. 광섬유와 박막 도파로의 경계에서의 필드프로필의 커다란 불일치는 박막도파로의 위에 의도적으로 성장시킨 결합도파로를 이용하여 효율적으로 피할 수 있었다.

• Optical Science and Technology
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• v.17 no.2
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• pp.15-20
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• 2013

• 전기의세계
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• v.31 no.6
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• pp.400-404
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• 1982

본고의 내용은 다음과 같다. 1. 광통신이란 2. 광섬유통신의 특징 3. 국내외의 응용현황 4. 전망

• Journal of the Korean Society for Nondestructive Testing
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• v.30 no.1
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• pp.36-45
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• 2010

This paper shows a multiplexing technique to maximize the application of a moire-fringe based fiber optic sensor to lots of structure. Especially, a novel fringe-based fiber optic sensor was proposed to overcome the difficulty of multiplexing of a previous moire-fringe-based fiber optic sensor. The novel fringe-based fiber optic sensor is composed of a single reflective fringe and two optical fibers. Therefore, the multiplexing is easily realized because of the simplicity of optic structure inside the sensor. This paper also proposed four models of the multiplexing techniques. The models are based on a wavelength division multiplexing(WDM) technique and a time division multiplexing(TDM) one. Basically, the models would be profitable for a general extrinsic fiber optic sensor such as the fringe-based fiber optic sensor. Finally, the real optic system was manufactured by using the proposed model and successfully examined to prove the feasibility of the model for the application.

• Proceedings of the Optical Society of Korea Conference
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• 2003.02a
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• pp.328-329
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• 2003

최근 전력 계통의 전압 상승과 측정 정밀도에 대한 요구가 증대됨에 따라 전력 설비의 고장 검출이나 측정 분야의 기술과 비용면에서 경쟁력을 갖춘 광을 이용한 고전압 대전류 측정이 주목받고 있다. 본 연구는 광섬유를 이용하여 보다 안전하고 정밀한 대전류 측정 장치 개발에 목적을 두고 있다. 광을 이용한 전류 센서는 편광된 광이 광섬유를 통과할 때 광섬유 주위의 자장에 의해서 편광면이 회전하는 패러데이 회전을 이용한 것이다. (중략)

• Proceedings of the Optical Society of Korea Conference
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• 2003.07a
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• pp.208-209
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• 2003

고밀도 광집적회로의 광도파로는 단일모드 광섬유와 굴절률의 차이 및 코어 크기에 의해 모드 부정합 문제가 존재한다. 본 논문은 이러한 모드 부정합 문제를 해결할 수 있는 모드 크기 변환기를 설계 하고 3-D Beam Propagation Method (BPM)을 이용하여 분석하였다. 모드 크기 변환기술에는 마이크로 렌즈, 테이퍼 광섬유, 렌즈화 광섬유가 사용되고 있으나 이는 패키징 가격이 높으며 광섬유와의 정렬 문제가 존재하므로, 집적된 실리콘 기판위에 제작하는 모드 크기 변환기에 대한 연구가 다각도에서 시도되고 있다. (중략)

• Information and Communications Magazine
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• v.11 no.2
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• pp.77-89
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• 1994

High speed optical fiber transmission technology has been remarkably improved during the past 20 years. This paper presents recent research status and future technological issues for the future information society, that is, the Tb/s transmission by frequency division multiplexing and the ultra long-distance by optical soliton transmission. Erbium-doped fiber amplifier and recent optical technology have brought optical transmission system of up to 10 Gb/s to the point of commercialization. Taking into account the future super information highway, that is, B-ISDN network, ultra wide-band picture-based information can be provided for many subscribers via existing optical fiber cables. However, to achieve the high speed transmission, the technologies must be developed not only for transmission lines but also for transmission nodes. Since the conventional signal transmission/processing technique using electronics has the limit in its speed, novel photonic technology is being developed for this purpose. On the other hand, optical solitons propagate stably through optical fibers, without pulse broadening effect of the fiber dispersion. Since the pulse broadening effect becomes serious as the transmission speed increases, optical solitons is the important technologies to realize the high speed, long distance transmission.

• Korean Journal of Optics and Photonics
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• v.27 no.1
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• pp.1-17
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• 2016

Over the past two decades, fiber-based lasers have made remarkable progress, now having reached power levels exceeding kilowatts and drawing a huge amount of attention from academy and industry as a replacement technology for bulk lasers. In this paper we review the significant factors that have led to the progress of fiber lasers, such as gain-fiber regimes based on ytterbium-doped silica, optical pumping schemes through the combination of laser diodes and double-clad fiber geometries, and tandem schemes for minimizing quantum defects. Furthermore, we discuss various power-limitation issues that are expected to incur with respect to the ultimate power scaling of fiber lasers, such as efficiency degradation, thermal hazard, and system-instability growth in fiber lasers, and various relevant methods to alleviate the aforementioned issues. This discussion includes fiber nonlinear effects, fiber damage, and modal-instability issues, which become more significant as the power level is scaled up. In addition, we also review beam-combining techniques, which are currently receiving a lot of attention as an alternative solution to the power-scaling limitation of high-power fiber lasers. In particular, we focus more on the discussion of the schematics of a spectral beam-combining system and their individual requirements. Finally, we discuss prospects for the future development of fiber laser technologies, for them to leap forward from where they are now, and to continue to advance in terms of their power scalability.

• Science of Emotion and Sensibility
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• v.14 no.4
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• pp.495-502
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• 2011

The plastic optical fiber has been previously known to have the limits in fabrication and care, due to its lack of flexibility and durability. Recently, an innovative technology of 'water-resistant & flexible optical fiber', in which the surface of etched POF(i.e., plastic optical fiber) is to be coated with a type of synthetic resin, has been developed. In this study, the post-treated POF-based flexible textiles were evaluated in terms of luminance, physical visibility and perceived visibility, according to the fabric lengths and colors of the light source. The POF-based flexible textile with 10cm fabric length and green light source appeared to show relatively higher illuminating effects. The maximum distance for perceived visibility of the POF-based flexible textiles was found to be 100m. Therefore, the results of this study are expected to be utilized as a fundamental for the further studies to develop the digital color clothing with application of POF-based flexible textile.