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Effect of junction capacitance on the rise time of led's and on the turn-on delay of injection lasers

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The space-charge capacitance of the forward-biased junction has been found to play a major role in (i) the apparent rise time of the emission from small-area, high-radiance led's and (ii) the apparent turn-on delay of stripe-geometry dh-structure laser diodes. For a zero-bias capacitance of 200 pF, a typical value for such devices made by oxide-masking techniques, the measured rise time of an led that is fully turned on and the turn-on delay time of injection lasers may be as much as twice the limitation imposed by the spontaneous carrier recombination time. A proposed method to reduce these delays by preshaping the driving pulse is analyzed, and a reduction of the delay by a factor of 2 or better is predicted. These results are in agreement with experiments.

Published in:

Bell System Technical Journal, The  (Volume:54 ,  Issue: 1 )

Date of Publication:

Jan. 1975

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