Abstract
The frequency response of light emitting diodes (LED's) in an edge, as opposed to surface, configuration is examined. We find that the frequency response is not limited by parasitic space charge capacitance, and thus, modulation frequencies in excess of 200 MHz can easily be obtained. If the internal heterojunction geometry is suitably arranged, it is possible to minimize coupling losses into low numerical aperature fibers so that these LED's are attractive sources for optical communications systems utilizing high data rates. Output power in excess of 1 mW at drive currents of ∼200 mA is typical.
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