Pulsed bias current for gain switched semiconductor lasers for amplified spontaneous emission reduction
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United States of America Patent
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Dec 26, 2017
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Dec 30, 2013
filing date -
Dec 31, 2012
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Abstract
Gain switched laser diode pulses are used as seed pulses for optical pulse generation. ASE is reduced by applying a prebias to the laser diodes at an amplitude less than that associated with a laser diode threshold. An electrical seed pulse having an amplitude larger than that associated with laser threshold is applied within about 10-100 ns of the prebias pulse. The resulting laser diode pulse can be amplified in a pumped, rare earth doped optical fiber, with reduced ASE.
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