Browsing Physics (Scholarly Publications) by Author "GUO, WEI-HUA"
Now showing items 1-10 of 10
-
Acceptance angle influence on optimum incident spot size for high-finesse microcavity two-photon absorption photodetectors
BRADLEY, LOUISE; GUO, WEI-HUA; DONEGAN, JOHN (2009)The influence of the limited acceptance angle of a high-finesse microcavity two-photon absorption photodetector on its response has been investigated. It is shown that the limited acceptance angle of the microcavity ... -
Compact 2-D FDTD Method Combined With Pad Approximation Transform for Leaky Mode Analysis
DONEGAN, JOHN; BYRNE, DIARMUID; GUO, WEI-HUA; LU, QIAOYIN (2010)Leaky mode analysis has been carried out based on the compact 2-D finite-difference time-domain (FDTD) method combined with the uniaxial anisotropic perfectly matched-layer (UPML) absorption boundary condition and the Pade ... -
Design of Slotted Single-Mode Lasers Suitable for Photonic Integration
DONEGAN, JOHN; BYRNE, DIARMUID; GUO, WEI-HUA; LU, QIAOYIN (2010)A single-mode laser structure suitable for photonic integration is presented. The laser can be fabricated by standard photolithography without any regrowth steps. Through optimization, a threshold current as low as 13 mA ... -
Discretely Tunable Semiconductor Lasers Suitable for Photonic Integration
DONEGAN, JOHN; LU, QIAOYIN; GUO, WEI-HUA (2009)Abstract?A sequence of partially reflective slots etched into an active ridge waveguide of a 1.5 ?m laser structure is found to provide sufficient reflection for lasing. Mirrors based on these reflectors have strong ... -
Enhancement of quality factor for TE whispering-gallery modes in microcylinder resonators
GUO, WEI-HUA; LU, QIAOYIN; DONEGAN, JOHN FRANCIS (2010)The enhancement of quality factor for TE whispering-gallery modes is analyzed for three-dimensional microcylinder resonators based on the destructive interference between vertical leakage modes. In the microcylinder ... -
Nine-channel wavelength tunable single mode laser array based on slots
DONEGAN, JOHN; NAWROCKA, MARTA; GUO, WEI-HUA (2013)A 9-channel wavelength tunable single-mode laser array based on slots is presented. The fabricated laser array demonstrated a threshold current in a range of 19~21 mA with the SOA unbiased at 20?C under continuous wave ... -
A novel two-section tunable discrete mode Fabry-Perot laser exhibiting nanosecond wavelength switching
DONEGAN, JOHN; GUO, WEI-HUA; LU, QIAOYIN (2008)A novel widely tunable laser diode is proposed and demonstrated. Mode selection occurs by etching perturbing slots into the laser ridge. A two-section device is realized with different slot patterns in each section ... -
OSNR monitoring using two fiber interferometers
GUO, WEI-HUA; BRADLEY, LOUISE (2010)In-band OSNR from 5 to 30 dB of a single 10 G NRZ-OOK channel was measured by two fiber interferometers within an accuracy of ±0.5 dB without requirement for knowledge of the noise-free extinction ratio of the signal. -
Single mode lasers based on slots suitable for photonic integration
DONEGAN, JOHN; LU, QIAOYIN; NAWROCKA, MARTA; GUO, WEI-HUA (2011)The re-growth free single mode lasers based on etched slots suitable for photonic integration are presented in this paper. The fabricated 650?m long laser exhibits a threshold current and a slope efficiency of about 32mA ... -
Waveguide Loss Measurement Using the Reflection Spectrum
DONEGAN, JOHN; LU, QIAOYIN; GUO, WEI-HUA (2008)A method for waveguide loss measurement purely based on the reflection spectrum is proposed. Using the Fourier series expansion of the single longitudinal mode in the reflection spectrum, the ratio between the second ...