Search results for: Purnawirman
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We demonstrate an athermally synchronized distributed feedback laser cascaded with microring filters on a silicon photonic platform, with >10dB extinction ratio and a synchronized wavelength shift of 0.02 nm/ ° from 20 to 50 °.
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A fully-integrated Q-switched laser is demonstrated at 1.9μm using thulium-doped aluminum oxide waveguides, with the potential for achieving an on-chip passively mode-locked laser. All components of the laser are fabricated in a CMOS-compatible silicon photonics process.
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We report on high-power CMOS-compatible thulium-doped distributed feedback and distributed Bragg reflector lasers with single-mode output powers up to 267 mW and 387 mW, and slope efficiencies of 14% and 23% respectively. More than 70 dB side-mode suppression ratio are achieved for both lasers. This work extends the applicability of silicon photonic microsystems into the 2 μm region.
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Double-chirped Bragg gratings for use in dispersion compensation are demonstrated using silicon nitride waveguides, on a silicon photonics platform that allows for 3-D integration of photonic devices with CMOS electronics.
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We demonstrate an erbium-doped fiber laser with a tunable silicon microring cavity. We measured a narrow laser linewidth (16 kHz) and single-mode continuous-wave emission over the C-band (1530nm-to-1560nm) at a swept-wavelength rate of 22,600nm/s or 3106THz/s.
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We demonstrate a DFB laser with a record low temperature (250 °C) fabrication process of low-loss (>0.1 dB/cm) amorphous Al2O3:Er3+ gain medium by utilizing the substrate bias, facilitating laser integration in a fully CMOS-compatible platform.
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We report a high power CMOS-compatible thulium-doped distributed feedback laser with single-mode output power up to 267 mW, 14% slope efficiency, and >70dB side mode suppression ratio.
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Integrated components necessary for a mode-locked laser are demonstrated on a platform that allows for monolithic integration with active silicon photonics and CMOS circuitry. CW lasing and Q-switched mode-locking are observed in the full structures.
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We report the study of self-pulsing behavior in erbium-doped fiber laser due to the ion-pair formation and scattered feedback. We observed the high doping concentration of the laser to be the main cause of the pulsing phenomenon. We also demonstrate that the self pulsing can be suppressed by resonance pumping.
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We demonstrate almost synchronized temperature dependent wavelength shift of Al2O3:Er3+ DFB laser (2.57 GHz/°C) and Si3N4 ring filter (2.47 GHz/°C), which makes it possible for on-chip transceiver operation without temperature control.
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We report on DFB and DBR lasers formed from a wavelength insensitive multi-segmented silicon nitride waveguide. Using a five-segment waveguide, we obtain lasing in erbium-doped DBR (−3.6 dBm) and DFB (−7.3 dBm) cavities.
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We present on the demonstration of a number of critical device technologies including record low power modulators, tunable filters, and integrated lasers, along with the world's largest silicon photonic circuit, integrated on a 300mm platform.
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We demonstrate erbium-doped waveguide lasers with lithographically-defined silicon nitride distributed Bragg reflectors. We measure output powers of up to 5 mW and show emission over a wide wavelength range (1536, 1561 and 1596 nm).
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Meteorology and Atmospheric Physics > 2012 > 115 > 1-2 > 35-45
This study evaluates the spectral scaling of a heavy rainfall event and assesses the performance of the Coupled Ocean/Atmosphere Mesoscale Prediction System (COAMPS) model in terms of the multiscale variability of rainfall in the temporal spectral domain. The event occurred over southern Malay Peninsula on 18 December 2006 and was simulated at high resolutions. 10, 5 and 1 min aggregate rainfall data...
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Journal of Raman Spectroscopy > 41 > 10 > 1156 - 1162
We report the surface‐enhanced Raman scattering (SERS) effect from the apex of single‐crystalline Ag nanowires (NWs). We also fabricated tip‐enhanced Raman spectroscopy (TERS) tips by attaching individual Ag NWs to W wires by using the alternating current dielectrophoresis (AC‐DEP) method. The single‐crystalline Ag NW tips could overcome many of the shortcomings of conventional TERS tips. Most importantly,...
