Hao-Tien Cheng
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View article: Clinical Trials of a Stroke Rehabilitation Trainer Employing a Speed-Adapted Treadmill
Clinical Trials of a Stroke Rehabilitation Trainer Employing a Speed-Adapted Treadmill Open
We propose a speed-adapted treadmill that can be incorporated into a rehabilitation trainer that applies neurodevelopmental treatment (NDT) for patients with stroke. NDT practice is effective for post-stroke patients, but its requirement f…
View article: Optical Interband Transitions in Fully Strained Ge 1− X Sn X Alloys
Optical Interband Transitions in Fully Strained Ge 1− X Sn X Alloys Open
View article: Monolithically Integrated 940 nm Half VCSELs on Bulk Ge Substrates
Monolithically Integrated 940 nm Half VCSELs on Bulk Ge Substrates Open
High-quality n-type AlGaAs distributed Bragg reflectors (DBRs) and lnGaAs multiple quantum wells (MQWs) were successfully monolithically grown on 4-inch off-cut Ge (100) wafers. Even without any design and process optimization for the Ge s…
View article: Study of monolithically integrated 940 nm AlGaAs distributed Bragg reflectors on graded GaAsP/bulk Si substrates
Study of monolithically integrated 940 nm AlGaAs distributed Bragg reflectors on graded GaAsP/bulk Si substrates Open
We report the fabrication of monolithically integrated 940 nm AlGaAs distributed Bragg reflectors (DBRs) on graded GaAsP/Si substrates. Low-density surface bumps and cross-hatch patterns were observed on the DBR surfaces. Cross-sectional D…
View article: 40.1-GHz sub-freezing 850-nm VCSEL: microwave extraction of cavity lifetimes and small-signal equivalent circuit modeling
40.1-GHz sub-freezing 850-nm VCSEL: microwave extraction of cavity lifetimes and small-signal equivalent circuit modeling Open
We present an 850-nm vertical-cavity surface-emitting laser (VCSEL) constructed for a wide operating temperature range from 25°C to −50°C sub-freezing temperature, demonstrating 40.1-GHz at −50°C. The optical spectra, junction temperature,…
View article: 29 GHz single-mode vertical-cavity surface-emitting lasers passivated by atomic layer deposition
29 GHz single-mode vertical-cavity surface-emitting lasers passivated by atomic layer deposition Open
The fabrication processes of high-speed oxide-confined single-mode (SM)-vertical-cavity surface-emitting lasers (VCSELs) are complex, costly, and often held back by reliability and yield issues, which substantially set back the high-volume…
View article: Monolithically integrated 940 nm half VCSELs on bulk Ge substrates
Monolithically integrated 940 nm half VCSELs on bulk Ge substrates Open
High quality n-type AlGaAs distributed Bragg reflectors (DBRs) and lnGaAs multiple quantum wells were successfully monolithically grown on 4-inch off-cut Ge (100) wafers. The grown structures have photoluminescence spectra and reflectance …
View article: Performance Analyses of Photonic-Crystal Surface-Emitting Laser: Toward High-Speed Optical Communication
Performance Analyses of Photonic-Crystal Surface-Emitting Laser: Toward High-Speed Optical Communication Open
This study conducts comprehensive performance analyses of a commercial photonic-crystal surface-emitting laser (PCSEL) via small-signal measurement and the bit-error-rate test. Meanwhile, the radio frequency characteristics of the PCSEL ar…
View article: Performance Analyses of Photonic-Crystal Surface-Emitting Laser: Toward High-Speed Optical Communication
Performance Analyses of Photonic-Crystal Surface-Emitting Laser: Toward High-Speed Optical Communication Open
This study conducts comprehensive performance analyses of a commercial photonic-crystal surface-emitting laser (PCSEL) via small-signal measurement and the bit-error-rate test (BERT). Meanwhile, the radio frequency (RF) characteristics of …
View article: Monolithic integration of 940 nm AlGaAs distributed Bragg reflectors on bulk Ge substrates
Monolithic integration of 940 nm AlGaAs distributed Bragg reflectors on bulk Ge substrates Open
High quality 940 nm Al x Ga 1-x As n-type distributed Bragg reflectors (DBRs) were successfully monolithically grown on off-cut Ge (100) substrates. The Ge-DBRs have reflectivity spectra comparable to those grown on conventional bulk GaAs …
View article: Recent Advances in 850 nm VCSELs for High-Speed Interconnects
Recent Advances in 850 nm VCSELs for High-Speed Interconnects Open
Vertical-cavity surface-emitting lasers (VCSELs) have made remarkable progress, are being used across a wide range of consumer electronic applications, and have particularly received much attention from the telecom and datacom industries. …
View article: Investigation of the current influence on near-field and far-field beam patterns for an oxide-confined vertical-cavity surface-emitting laser
Investigation of the current influence on near-field and far-field beam patterns for an oxide-confined vertical-cavity surface-emitting laser Open
This experiment presents dynamic behaviors between the operating current and the optical beam images of vertical-cavity surface-emitting lasers (VCSELs) with two different aperture diameters of 3 µm (single-mode) and 5 µm (multi-mode). The…