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Junction-current-confinement planar light-emitting diodes and optical coupling into large-core diameter fibers using lenses

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6 Author(s)
Escher, J.S. ; Motorola, Inc., Phoenix, AZ, USA ; Berg, H.M. ; Lewis, G.L. ; Moyer, C.D.
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High-radiance AlGaAs-GaAs double-heterostructure light-emitting diodes utilizing junction current confinement are described. Diode resistance and junction ideality factor are investigated as a function of emission diameters from 10 to 75 µm. Near-field intensity profiles indicate tight current confinement over the full range of emission diameters. Rise-time measurements are consistent with a simple carrier lifetime model for >25-µm emission diameters. An effective radiative-recombination constant, B = 1.5(±0.5) × 10-10cm3/s is deduced from the rise-time data and model. Peak wavelength and spectral width data are discussed in terms of junction current density and temperature. With decreasing emission diameter, the optical coupling efficiencies into 100- and 200-µm core diam high-numerical-aperture fibers increased from 10 to 25 percent and 25 to 50 percent, respectivley, using spherical glass lenses.

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Electron Devices, IEEE Transactions on  (Volume:29 ,  Issue: 9 )