[6p-A414-1~21] 3.8 光計測技術・機器

▲ [6p-A414-16] Autocorrelation measurement of ultrafast optical pulses using silicon p-i-n waveguides as two-photon absorption detector

〇Guangwei Cong¹、Morifumi Ohno¹、Yuriko Maegami¹、Makoto Okano¹、Koji Yamada¹ (1.AIST)

キーワード：autocorrelation, silicon photonics, two-photon absorption

Optical autocorrelation measurement is indispensable for characterizing ultrafast optical pulses in picosecond or femtosecond orders. Traditionally such measurements are performed using autocorrelators which are consisted of free-space optics components and bulk-like photodetectors such as second-harmonic generation (SHG) crystals with photomultipliers and two-photon conductivity (TPC) detectors. Recently, achieving autocorrelation detection using photonic waveguides is believed promising to realize low-cost, small-size, and high-sensitivity autocorrelators , which are highly required in miniaturized ultrafast laser systems. Moreover, it could enable integrated autocorrelation functionality for on-chip pulse diagnosis and characterization. In this paper, we demonstrate the autocorrelation detecting of ultrafast pulses utilizing two-photon absorption (TPA) in silicon p-i-n waveguides. Since this waveguide is well-established in silicon photonics and widely used as the phase shifters for modulators and switches, this work shows the feasibility to achieve the truly applicable integrated-type autocorrelators using silicon photonics technology and could enable novel silicon photonic devices utilizing on-chip autocorrelation functionality.