Browsing by Author "Lee, Hung-Yi"

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Evaluation of Analog Performance of Monolayer and Bilayer Two-Dimensional Transition Metal Dichalcogenide (TMD) MOSFETs
(2017-01-01)
Lee, Hung-Yi
;
Yu, Chang-Hung
;
Su, Pin
;
Chuang, Ching-Te
;
電子工程學系及電子研究所
We investigate the analog performance of monolayer and bilayer two-dimensional transition metal dichalcogenide (TMD) MOSFETs. The device analog metrics including the transconductance (g(m)), output resistance (R-o) and intrinsic gain (g(m) x R-o) for TMD device are investigated using 3D atomistic TCAD simulations. It is shown that bilayer TMD devices exhibit better analog performance compared with monolayer TMD devices. The impacts of different mobility ratios of bilayer TMD devices to monolayer TMD devices are examined.
Multiple pulses and harmonic mode locking from passive mode-locked Ytterbium doped fiber in anomalous dispersion region
(2015-01-01)
Lin, Ja-Hon
;
Lee, Hung-Yi
;
Hsieh, Wen-Feng
;
光電工程學系
;
光電工程研究所
In this work, we investigate the passive mode-locked Ytterbium-doped fiber laser based on the nonlinear polarization rotation technique. With the grating pairs inside laser cavity for the GVD compensation, the total cavity dispersion is operated within anomalous dispersion region. As the laser operates at fundamental mode locking, it generates 35 MHz repetition rate mode-locked pulse with 3.3 ps pulsewidth and the optical spectrum reveals obvious Kelly side. After adjusting the waveplate or increase the pump power, the 2nd HML to 6th harmonic mode locking (HML) is demonstrated in this laser. Besides, we also generated the bound states of multiple solitons whose separation of each pulse is about several tens of picosecond. The number of solitons and the separation between sequential pulses could be controlled so that it could be used in optical communication.