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Showing 1 to 20 of 32 for “"vertical cavity surface emitting lasers (VCSELs)"”.
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Glucose monitoring measuring blood glucose using vertical cavity surface emitting lasers (VCSELs)
… for which the use of thermally tunable vertical cavity surface emitting lasers (VCSELs) as the light source to obtain blood absorption spectra, along with a multivariate technique (Partial Least Square (PLS) techniques) for analysis, is proposed. VCSELs are semiconductor lasers with …
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Coherent laser arrays from bottom-surface vertical-cavity surface-emitting lasers
Vertical-cavity surface-emitting lasers (VCSELs) are among the best choices for high beam quality semiconductor lasers. By designing a VCSEL array for uniform current injection and having the output coupler on the substrate side of the laser cavity, the laser will more easily operate in the …
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Vertical-cavity surface-emitting laser (VCSEL) for 50Gb/s NRZ optical link in data center
Oxide-confined Vertical-cavity Surface-Emitting Lasers (VCSELs) at 850 nm have been widely deployed in optical data transmission as the optical transmitters. However, the data transmission capability of commercial VCSELs used in 100 m optical links with direct non-return-to-zero (NRZ) modulation …
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Electrical parasitics and parameter extraction of photonic crystal vertical-cavity surface-emitting lasers
Directly modulated vertical-cavity surface-emitting lasers (VCSELs) are the dominant digital light source in short-haul data communication links. To address the ever-increasing demand for improved performance, namely the power consumption, data rate, and device reliability, single mode …
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Characterization of VCSELs for Circuit Simulation
… of laser diodes for circuit simulation. Vertical cavity surface emitting lasers (VCSELs) modeled by rate equations are emphasized. Measurements are used to determine the parameters of two specific rate equation models. The first model includes the nonlinear gain and carrier recombination …
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Circuit-Level Modeling and Simulation of Semiconductor Lasers
We then present circuit-level models for vertical-cavity surface-emitting lasers (VCSELs) and their strong thermally and spatially dependent behavior. The first approach, implemented in both HSPICE and SABER, is a simple thermal model which incorporates a temperature-dependent offset current into …
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Organic LEDs for optoelectronic neural networks
… investigate the characteristics of Organic Light Emitting Diodes (OLEDs) and assess their suitability for use in the Compact Optoelectronic Integrated Neural (COIN) coprocessor. The COIN coprocessor, a prototype artificial neural network implemented in hardware, seeks to implement neural network …
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Optical loss and high-speed modulation of vertical-cavity surface-emitting lasers
Vertical-cavity surface-emitting lasers (VCSELs) are microcavity semiconductor lasers used extensively as the light source of short-haul optical data communication and optical interconnects. By increasing the efficiency and modulation speed of these devices, it will be possible to continue to meet …
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Theory and simulation of subwavelength high contrast gratings and their applications in vertical-cavity surface-emitting laser devices
… be explored. Following this, the fundamentals of vertical-cavity surface-emitting lasers (VCSELs) will be discussed, and the applications of subwavelength gratings when used with these lasers will follow. Several devices, both theoretical proposals and fabricated examples, will be presented in …
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Vertical Cavity Surface-Emitting Lasers Operating With Multiple Photonic Crystal Defect Cavities
Coherently coupled arrays of vertical cavity surface emitting lasers (VCSELs) offer the potential of extended area coherent sources with high spectral purity, useful in a variety of applications in the high power (laser radar, optical communications, steerable sources) and low power (image …
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Modulation approaches of vertical-cavity surface-emitting lasers with mode control
Vertical-cavity surface-emitting lasers (VCSELs) are currently the most popular light source for short-haul optical data communication primarily due to their low cost and low operating power. To address the needs for improved data rate, power consumption, and device lifetime, various approaches of …
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Development of InP DHBT for 5G millimeter-wave power amplifier and GaAs photodetector for 50 Gb/s optical link
… photodetector to be paired with high-speed vertical-cavity surface-emitting lasers (VCSELs) for short-range transmission at 850 nm. High-speed photodetector holds the key to higher data rate and lower energy consumption, which can help resolve the rising data traffic with high power …
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Numerical Simulation of Vertical Cavity Surface Emitting Lasers
In response to the growing importance of vertical cavity surface emitting lasers (VCSELs), the semiconductor laser simulator Minilase has been extended to allow simulation of VCSEL devices. The fundamental physics of VCSELs are no different from the physics of other semiconductor lasers; however, …
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Self-heating control of edge emitting and vertical cavity surface emitting lasers
… the control of self-heating of both edge emitting laser diodes and vertical cavity surface emitting lasers (VCSELs). For the 980nm high power edge emitting laser, asymmetric waveguide is used for low free carrier absorption loss. The waveguide and cladding materials are optimized for high …
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Simulating the Modulation Response of Vertical -Cavity Surface -Emitting Lasers
… extended to simulate the dynamic response of vertical-cavity surface-emitting lasers (VCSELs). Various nonlinear gain effects due to carrier transport have been self-consistently accounted for by MINILASE and their important roles in the modulation response are studied and clarified. First, it …
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Heterogeneously bonded vertical cavity surface emitting lasers and thermal modeling
… consist of different materials for the light emitting region and the substrate. In this dissertation, a post-fabrication bonding technique for integrating semiconductor vertical cavity surface emitting lasers (VCSELs) onto hybrid substrates is demonstrated. This approach provides flexibility …
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Low threshold vertical cavity surface emitting lasers integrated onto Si-CMOS ICs using novel hybrid assembly techniques
… has been developed and demonstrated to integrate vertical cavity surface emitting lasers (VCSELs) on silicon CMOS integrated circuits for optical interconnect applications. Individual oxide-apertured 850 nm AlGaAs VCSEL micro-devices discs, 8 Ctm tall and 55 ptm in diameter (pills), have been both …
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Magnetic assisted statistical assembly
… optoelectronic devices, specifically integrating vertical cavity surface emitting lasers (VCSELs), edge-emitting lasers (EELs), and light emitting diodes(LEDs) onto commercially processed Si-CMOS circuits. This method, magnetically assisted statistical assembly (MASA), incorporates past methods …
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Fully coupled electrical and optical simulation of vertical cavity surface emitting lasers
… to accommodate the cylindrical geometry of vertical cavity surface emitting lasers (VCSELs). Second, an accurate band structure using the well-known k · p method, altered to include various external potentials, has been added in a fully self-consistent manner. The k · p method also yields …
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Improving the efficiency and threshold current of photonic crystal vertical-cavity surface-emitting lasers
… low threshold, and high efficiency single mode VCSELs. Various mechanisms that affect the differential quantum efficiency and threshold current of the proton-implanted and oxide-confined photonic crystal vertical-cavity surface-emitting lasers (VCSELs) are studied. Three degrees of freedom in …
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