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Structure of high resistivity GaAs film grown by low-temperature metalorganic chemical vapor deposition

(1996-11-18)

Chen, WC

;

Chang, CS

;

Chan, SH

;

光電工程學系

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Department of Photonics

The structure of a low-temperature GaAs layer grown by low-pressure metalorganic chemical vapor deposition with precursors of triethylgallium and arsine is reported. Dense particles containing Ga clusters are found in a high resistivity GaAs film grown at 420 degrees C, The size and concentration of particles are about 800-1000 nm and 7X10(11) cm(-3), respectively. (C) 1996 American Institute of Physics.

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(1996-11-20)

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(1996-11-20)

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Reduction of semiconductor laser amplifier induced distortion and crosstalk for WDM systems using light injection

(1996-11-21)

Ho, KP

;

Liaw, SK

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Lin, CL

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光電工程研究所

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Institute of EO Enginerring

Semiconductor laser amplifiers muse both distortion and crosstalk in WDM systems due to gain saturation. A method using Light injection is experimentally demonstrated to reduce distortion and crosstalk, In a two-channel experiment with a data rate of 2.5 Gbit/s, it is found that light injection can eliminate the BER floor due to distortion and crosstalk.

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Reduction of semiconductor laser amplifier induced distortion and crosstalk for WDM systems using light injection

(1996-11-21)

Ho, KP

;

Liaw, SK

;

Lin, CL

;

光電工程學系

;

Department of Photonics

Semiconductor laser amplifiers muse both distortion and crosstalk in WDM systems due to gain saturation. A method using Light injection is experimentally demonstrated to reduce distortion and crosstalk, In a two-channel experiment with a data rate of 2.5 Gbit/s, it is found that light injection can eliminate the BER floor due to distortion and crosstalk.

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A modified H-2 feedforward active control system for suppressing broadband random and transient noises

(1996-11-21)

Bai, M

;

Chen, H

;

交大名義發表

;

機械工程學系

;

National Chiao Tung University

Three feedforward active noise control algorithms based on H-2, H-infinity, and modified H-2 optimal model matching principles are investigated in this study. The first two methods provide significant attenuation for broadband random noises. However, the H-2 and H-infinity methods generally result in high-gain controllers at high frequencies, which calls for some truncation measures in the frequency domain. The third method effectively eliminates the high-gain problem of the ordinary H-2 and H-infinity algorithms. In addition, this method is guaranteed to result in a causal and stable controller which is crucial in practical implementation. The algorithms are coded into controllers by using a floating-point digital signal processor. The experimental results show significant attenuation for stationary broadband random noises as well as transient impact noises in a duct. (C) 1996 Academic Press Limited

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