Patent ID: 6980290

Claim:
An optical sampling waveform measuring apparatus, comprising: a signal generator section for outputting pulses-to-be-measured; a sample pulse generator section for outputting electric sampling pulses; and an evaluation section for evaluating properties of pulses consisting of the pulses-to-be-measured and the sampling pulses; wherein the sample pulse generator section further includes: a pulse light source for emitting optical sampling pulses having a cycle frequency (f sig /n) of corresponding to the frequency of the electric sampling pulses; an optical amplifier for amplifying the optical sampling pulses and emitting amplified pulses; a Raman-shift fiber for generating a Raman-shift beam in accordance with intensity of the emitted amplified pulses; a band-pass filter for separating the optical sampling pulses from said Raman-shift beam and emitting only the Raman-shift beam; and a polarization direction controller for controlling a polarization direction of the separated Raman-shift beam, and outputting polarization-controlled optical sampling pulses having a cycle frequency f sig ; and wherein the evaluation section applies a sum frequency light generation effect in which a first kind of phase matching condition is used as a nonlinear optical effect.