Results 201 to 210 of about 47,639 (261)

Bridging Practice and Theory: The Emerging Potential of Design-based Research (DBR) for Digital Innovation in Education

Education, research and perspectives, 2020
Design-based research (DBR) and cognate, practitioner-oriented methodologies have gained increased prominence in the last twenty-five years, and in particular have become established approaches for exploring how we might best optimise the potential ...
T. Hall
semanticscholar   +1 more source

Nonlinear Effects Analysis in DBR Lasers: Applications to DBR-SOA and New Double Bragg DBR

IEEE Journal of Selected Topics in Quantum Electronics, 2007
This paper presents a theoretical and experimental study of nonlinear effects in distributed Bragg reflector (DBR)-type tunable lasers, which are responsible for asymmetric spectral or power characteristics, and for hysteresis phenomena. We propose an optimized DBR semiconductor optical amplifier design that suppresses these effects, making the control
Helene Debregeas-Sillard, Catherine Fortin, Alain Accard, Olivier Drisse, Estelle Derouin, Frederic Pommereau, Christophe Kazmierski   +6 more
openaire   +1 more source

The COMBO DBR: Comb-Optimized DBR Laser for Versatile Design

2018 IEEE International Semiconductor Laser Conference (ISLC), 2018
In this paper we describe a novel design of DBR laser that utilizes sampled gratings to optimize mirror loss and mirror bandwidth independently. This versatile design approach has enabled a wide variety of lasers, from compact low power consumption to high power and MOPA designs.
G.B. Morrison, J. Sherman, I. Gonzalez, K. Ottoson, J. Campbell, S. Estrella, R. Moreira, P. Leisher, D. Renner, L. Johansson, M. Mashanovitch   +10 more
openaire   +1 more source

Miniature DBR with series capacitive loading

2010 10th Mediterranean Microwave Symposium, 2010
AbstractA new miniature dual behavior resonator (DBR) topology with capacitors placed in series between the feed lines and the stubs is demonstrated. Design equations are derived. For a proof‐of‐concept, a first‐order prototype with a 1‐GHz working frequency and 70% size reduction is realized, measured, and compared with a classical DBR.
Issa, H., Duchamp, J.-M., Abou-Chahine, S., Ferrari, P.   +3 more
openaire   +2 more sources

Competition Noise in DBR Tunable Lasers

Fluctuation and Noise Letters, 2003
Tunable Lasers are key-components for Wavelength Division Multiplexing optical communication applications at 1.55μ m . In this paper, we report the study of low to mid frequency noise power spectral densities and correlation factors in various spectral purity configurations, using the Bragg section tunability around a mode-hopping situation.
Myara, M., Signoret, P., Tourrenc, J.P., Perez, J.-P., Orsal, B., Alabédra, R., Jacquet, J.   +6 more
openaire   +1 more source

10 Gb/s NRZ and 20 Gb/s PAM4 Transmission Using an EAM-Integrated Widely Tunable DBR Laser

IEEE Photonics Technology Letters, 2019
We report data transmissions using a widely tunable InP-based distributed Bragg reflector (DBR) laser integrated monolithically with an electroabsorption modulator (EAM).
Yunlong Liu, Lichen Zhang, Xiaobo La, S. Liang, Lingjuan Zhao, Wei Wang   +5 more
semanticscholar   +1 more source

Continuous wave and pulse (2–100 ns) high power AlGaAs/GaAs laser diodes (1050 nm) based on high and low reflective 13th order DBR

Semiconductor Science and Technology, 2019
The paper presents the experimental results of a study of higfh-power laser diodes with a surface distributed Bragg reflector of 13-th and 16-th diffraction order emitting at a wavelength of 1026 nm and 1050 nm in a continuous and pulsed pump mode.
V. V. Zolotarev, A. Leshko, V. V. Shamakhov, D. Nikolaev, V. Golovin, S. Slipchenko, N. Pikhtin   +6 more
semanticscholar   +1 more source

Sub-kHz Linewidth Extended-DBR Lasers Heterogeneously Integrated on Silicon

Optical Fiber Communications Conference and Exhibition, 2019
We demonstrate single-mode E-DBR lasers with 1kHz linewidth and >37mW output power, and ring-assisted E-DBR lasers with 500Hz linewidth, by heterogeneously integrating III-V gain material with a 15mm long ultra-low loss silicon waveguide-based Bragg ...
Duanni Huang, M. Tran, Joel Guo, J. Peters, T. Komljenovic, A. Malik, P. Morton, J. Bowers   +7 more
semanticscholar   +1 more source

Digital wavelength-selected DBR laser

SPIE Proceedings, 2003
Widely tunable monolithic InP lasers can, in principle, cover one or other of the Er-doped fibre amplifier windows. These windows span wavelength ranges of around 40-50nm. However, the change in refractive index that can be achieved by current injection into a grating section is limited to about 1-2% corresponding to around 10-20nm in wavelength, so ...
Neil D. Whitbread, Andrew J. Ward, Lalitha Ponnampalam, David J. Robbins   +3 more
openaire   +1 more source

Wavelength and mode stabilization of widely tunable SG-DBR and SSG-DBR lasers

IEEE Photonics Technology Letters, 1999
A novel mode stabilization scheme for widely tunable SG-DBR and SSG-DBR lasers is demonstrated. It is shown that a minimum in active section voltage is obtained when a cavity mode and a reflection peak of each DBR mirror are aligned. Locking the laser to such a local minimum in active section voltage therefore ensures stable single-mode operation.
G. Sarlet, G. Morthier, R. Baets
openaire   +1 more source