• The Transactions of the Korean Institute of Power Electronics
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• v.8 no.1
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• pp.89-97
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• 2003

High frequency common mode voltage produced by PWM inverter fed Induction motor is a major cause of conducted EMI, creation motor ground currents, bearing currents and other harmful products. The zero switching states of inverter control invoke large in comparison with the non-zero switching state of Inverter control. We proposed a common mode voltage reduction method based on sinusoidal PWM technique. PWM signal are generated by comparing respective sinusoidal reference signal with three triangular carrier wave displaced of 120$^{\circ}$. Simulation and experimenta1 result show that common mode voltages in the proposed PWM technique are reduced by approximate 66% more than conventional FWM technique.

• Korean Journal of Optics and Photonics
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• v.9 no.2
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• pp.123-126
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• 1998

We derived an equation showing the temperature dependence of the zero-dispersion wavelength and measured the temperature dependence of the zero dispersion wavelength using four-wave mixing in dispersion shifted fibers in the range of $22^{\circ}C-59^{\circ}C$ From the experimental results, we found that the zero-dispersion wavelength is increased as the temperature around DSF increases and its temperature dependence is 0.032 nm/$^{\circ}C$. Also, the calculated behavior of FWM efficiency coincided with the experimental result.

• Korean Journal of Optics and Photonics
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• v.13 no.5
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• pp.425-429
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• 2002

In this paper, we propose new simple schemes for all-optical serial-to-parallel and parallel-to-serial data format converters based on a semiconductor laser amplifier in a loop mirror (SLALOM) for all-optical data processing. They have the advantages of simple and easily expandable structure, efficient operation and easy implementation. We implement the proposed all-optical data converters. and experimentally demonstrate their operation.