The invention relates to a
pilot-adaptive Mach-Zehnder modulator
laser pulse adjustment module. The
pilot-adaptive Mach-Zehnder modulator
laser pulse adjustment module comprises a
laser, a Mach-Zehnder modulator, an
optical coupler, a DSP bias
voltage control module, and a pulse output module, wherein the DSP bias
voltage control module produces a
pilot signal for the Mach-Zehnder modulator and then feeds back an output
light signal to the DSP bias
voltage control module for FFT, so as to obtain amplitude components and phase relations of corresponding first
harmonic and secondary
harmonic, aharmonic
amplitude ratio is used as an
error signal, so as to make a working point of the Mach-Zehnder modulator stabilize at a
NULL point through digital PID; a pulse
signal is loaded for pulse adjustment; pulses at different frequencies have different interference on pilot, as a result, the
NULL point cannot be stabilized, the DSP bias
voltage control module adjusts frequency of the pilot adaptively till the
NULL point is stabilized again. Due to introduction of the pilot adaptive adjustment technology, output of high
extinction ratio of laser pulse of any frequency is realized.