MODULATION CHARACTERISTIC OF WAVE-GUIDE-TYPE OPTICAL FREQUENCY COMB GENERATOR

We report the modulation characteristics of a waveguide-type optical f requency comb generator (WG-OFCG) with the advantages of compactness, high modulation index and loss. driving power, The characteristics of the optical frequency comb (OFC) generated when the modulation index e xceeds 2 pi are discussed. The power of the modulation sidebands was m easured by the optical heterodyne method with an external-cavity laser as a local oscillator, The dependence of the modulation index of the WG-OFCG on the modulation frequency up to 40 GHz was measured. The gen eration span of the OFC at the modulation frequency detuned from an in teger multiple of the free spectral range (FSR) is discussed.