• 한국안전학회지
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• 제31권5호
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• pp.1-6
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• 2016

The performance of a set of low-cost optical components used for measuring the optical density of PM particles was evaluated in the present study. To this end, the set of low-cost optical components was replaced with that of general optical components used to measure the PM optical density under identical experimental conditions. The optical densities measured from the set of general optical components were then compared to those obtained from the set of low-cost optical components. While the optical density is measured, another key parameter, the dimensionless extinction constant of PM particles (which is needed to optically measure the PM concentration) was also determined in the present study. The experimental results indicate that the optical density and PM concentration measurements performed by low-cost optical components are feasible, producing trackable variations in the OD and concentrations compared to values obtained from the set of general optical components.

• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 2002년도 춘계학술대회 논문집
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• pp.491-495
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• 2002

In the paper, a Visual factory model for a optical-components manufacturing process is built. The optical-components manufacturing process is composed of 3 operation processes; optical sub assembly process, package assembly process, and fiber assembly process. Each process is managed not a batch mode, which is one of most popular manufacturing styles to produce a great deal of industrial output, but though a modular cell. In the processes, a modular cell has to be processed independently of the other cells. Optimization for the composition of assembly cell in the optical-components system is made by the Visual factory model.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2002년도 춘계학술대회 논문집
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• pp.636-639
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• 2002

In the paper, a Visual factory model for a optical-components manufacturing process is built. The optical-components manufacturing process is composed of 3 operation processes; optical sub assembly process, package assembly process, and fiber assembly process. Each process is managed not a batch mode, which is one of most popular manufacturing styles to produce a great deal of industrial output, but though a modular cell. In the processes, a modular cell has to be processed independently of the other cells. Optimization for the composition of assembly cell in the optical-components system is made by the Visual factory model.

• 한국고분자학회지:고분자과학과기술
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• 제18권2호
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• pp.153-158
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• 2007

• 광산업정보
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• 통권34호
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• pp.12-17
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• 2006

대만은 광산업 분야를 OE(Optoelectronics Components, FPD(Flat Panel Display), Optical Storage, Optical Lens Components & Laser Applications, OFC(Optical Fiber Communications, Optical Input & Output Devices 등 6개 대분류로 나누고 있으며 수년간 중점적으로 육성해 온 분야는 OE 및 FPD와 관련이 큰 LED 분야이다.

• ETRI Journal
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• 제34권6호
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• pp.954-957
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• 2012

Titanium foils for use in photoelectrochemical devices are treated with a $HNO_3$-HF solution. After this treatment, the optical reflection characteristics of the Ti substrates are markedly increased in terms of not only reflectivity but also optimized wavelength. Furthermore, the "multiple beam interference" theory and optical analysis of surface morphologies clearly verify the origin of the optimized optical reflection properties.

• ETRI Journal
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• 제31권6호
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• pp.770-777
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• 2009

We have developed a fully functional reconfigurable optical add-drop multiplexer (ROADM) switch module using a polymer integrated photonic lightwave circuit technology. The polymer variable optical attenuator (VOA) array and digital optical switch array are integrated into one polymer PLC chip and packaged to form a 10-channel VOA integrated optical switch module. Four of these optical switch modules are used in the ROADM switch module to execute 40-channel switching and power equalization. As a wavelength division multiplexer (WDM) filter device, two C-band 40-channel athermal arrayed waveguide grating WDMs are used in the ROADM module. Optical power monitoring of each channel is carried out using a 5% tap PD. A controller and firmware having the functions of a 40-channel switch and VOA control, optical power monitoring, as well as TEC temperature control, and data communication interfaces are also developed in this study.

• ETRI Journal
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• 제30권5호
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• pp.744-746
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• 2008

This letter presents a crosstalk-enhanced polymer thermo-optic digital optical switch operating at a low power consumption. Modified radiation-type attenuators are integrated in a series with a conventional $1{\times}2$ digital optical switch. A low optical crosstalk of less than -45 dB is attained at a low applied switching power of 60 mW, and an insertion loss of about 1.1 dB is exhibited.

• ETRI Journal
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• 제29권5호
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• pp.633-640
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• 2007

We report an experimental demonstration of 40 Gbps all-optical 3R regeneration with all-optical clock recovery based on InP semiconductor devices. We also obtain alloptical non-return-to-zero to return-to-zero (NRZ-to-RZ) format conversion using the recovered clock signal at 10 Gbps and 40 Gbps. It leads to a good performance using a Mach-Zehnder interferometric wavelength converter and a self-pulsating laser diode (LD). The self-pulsating LD serves a recovered clock, which has an rms timing jitter as low as sub-picosecond. In the case of 3R regeneration of RZ data, we achieve a 1.0 dB power penalty at $10^{-9}$ BER after demultiplexing 40 Gbps to 10 Gbps with an eletroabsorption modulator. The regenerated 3R data shows stable error-free operation with no BER floor for all channels. The combination of these functional devices provides all-optical 3R regeneration with NRZ-to-RZ conversion.

• 한국광학회지
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• 제24권6호
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• pp.297-310
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• 2013

스마트 기기, 클라우드 서비스, 광가입자망 등의 보급에 따른 멀티미디어 기반의 대용량 인터넷 트래픽의 급속한 증가로 통신 수요는 연 40%이상씩 증가하고 있다. 이러한 대역폭 증가를 수용하기 위해서 광통신용 광부품의 진화도 각 계층별로 빠르게 진행되고 있다. 가입자망에서는 변조속도 증가와 더불어 파장다중방식의 도입이 시작되고 있고, 매트로망에서는 보다 효율적인 망 운용을 위해 차세대 ROADM에 대한 개발이 진행중이며, 장거리 통신에서는 코히어런트 통신 기반의 새로운 변조방식이 도입되어 스팩트럼 효율을 향상시키고 있다. 본 논문에서는 이러한 폭발적인 통신 대역폭 증가 요구에 따른 광통신망의 진화와 이를 수용하기 위한 고속화, 효율화, 저전력화로 발전하고 있는 핵심 광부품에 대해 살펴본다.