An improved optoelectronic harmonic mixer (OEHM) has been employed for measuring the timing noise of optical pulses that are generated from a mode-locked laser diode by the temporal Talbot effect. The OEHM makes use of a low-drive voltage modulator and a W-band unitraveling carrier photodiode for converting the pulse intensity into a low-frequency electrical signal. The time domain demodulation technique has been used for the precise evaluation of phase noise power spectral density. The rms timing jitter has been estimated to be for the bandwidth.
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