Apparatus and method for stabilizing bias voltage for pulse generating modulator
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United States of America Patent
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Sep 4, 2007
Grant Date -
Jun 16, 2005
app pub date -
Apr 16, 2004
filing date -
Dec 15, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention relates to an apparatus and method for stabilizing a bias voltage for a pulse generating modulator, which can automatically detect an optimal bias voltage for an external modulator, which is used in RZ or CSRZ modulation of an optical transmission signal using NRZ data to generate a reference pulse optical signal, and maintain the optimal bias voltage. In the bias voltage stabilizing method of the present invention, an output signal of the external modulator, to which the bias voltage to be stabilized is applied, is detected, a drive clock signal applied to the external modulator is detected, a mean output value of the products obtained by the multiplication of the output signal and the clock signal is periodically examined, and the bias voltage is adjusted so that the mean output value becomes '0'.
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