• Proceedings of the Optical Society of Korea Conference
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• 2005.02a
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• pp.296-297
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• 2005

• Proceedings of the Optical Society of Korea Conference
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• 2009.10a
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• pp.312-313
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• 2009

• Proceedings of the Optical Society of Korea Conference
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• 2001.08a
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• pp.288-289
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• 2001

• Proceedings of the Optical Society of Korea Conference
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• 2004.07a
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• pp.156-157
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• 2004

• Proceedings of the Optical Society of Korea Conference
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• 2006.07a
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• pp.191-192
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• 2006

• Proceedings of the Optical Society of Korea Conference
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• 2002.11a
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• pp.46-47
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• 2002

• Journal of the Korea Institute of Information and Communication Engineering
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• v.10 no.2
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• pp.220-223
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• 2006

In this paper, we studied about the level controller of optical signal with 40 channels by 4 VOA(Variable Optical Attenuator) with 12 channels. Total 8 microprocessors control 40 chamois for control of optical signal level so that a microprocessor controls 5 channels each. Moreover a microprocessor was added to communicate with outside and transfer instruction to each microprocessor. The output optical signal is measured and VOA is controlled as a result of it. The VOA outputs is inputted into PD(Photo Detector) at once. We could control multi-channel optical signals simply like this.

• Proceedings of the Optical Society of Korea Conference
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• 2004.07a
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• pp.258-259
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• 2004

• ETRI Journal
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• v.33 no.2
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• pp.275-278
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• 2011

This letter presents a polymer $1{\times}2$ thermo-optic totalinternal-reflection digital optical switch (TIR-DOS) with an index contrast of 1.5%-${\delta}$ operating at low power consumption. The structure of our $1{\times}2$ TIR-DOS was created by adding a reflection port to that of a conventional multimode filtering variable optical attenuator. To improve the total-internalr-eflection efficiency, a heater offset was applied to the crossing region of multimode waveguides of the TIR-DOS. The fabricated $1{\times}2$ TIR-DOS shows a low electrical power consumption of 18 mW for an on-off ratio of 35 dB.

• Korean Journal of Optics and Photonics
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• v.27 no.4
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• pp.127-132
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• 2016

In this paper, a trench structure was fabricated by femtosecond-laser machining to eliminate thermal crosstalk in a multichannel variable optical attenuator (VOA), to prevent decreasing attenuation efficiency of the VOA. Trenches of a variety of widths and depths were fabricated on the VOA chips by femtosecond-laser processing. After the machining, attenuation according to current change was observed in each VOA chip module with trenches. As a result, we could observe high responsivity of attenuation and low power consumption, and that the heat of each channel barely influenced other channels.