[17a-WL2_401-1~11] 3.13 Silicon photonics, Photonics-electronics convergence, Optical control

9:30 AM - 9:45 AM JST(12:30 AM - 12:45 AM UTC)

[17a-WL2_401-3] Optimal silicon photonic waveguide geometry for quantum source

〇Makoto Nakai¹, Takayuki Matsui¹, Takafumi Ono² (1.TCRDL, 2.Kagawa Univ.)

Keywords:

silicon photonics,quantum source,spontaneous four-wave mixing

Photon-pair generation via spontaneous four-wave mixing (SFWM) in silicon photonic waveguides was investigated by calculating an optimal structure while accounting for the trade-off between propagation loss and phase matching. Using experimentally measured loss coefficients, the photon-pair generation rate was calculated for waveguides with widths of 0.5–3.0 µm and lengths of 0.5–20 cm. For waveguide lengths below 1 cm, the smallest width (0.5 µm) was advantageous due to superior phase matching. For lengths of 1 cm or longer, however, the impact of propagation loss became dominant, and a wider waveguide provided a higher generation rate, shifting the optimal width to larger values. Under the conditions considered in this study, the maximum photon-pair generation rate was obtained for a waveguide with a width of 1.0 µm and a length of 6.5 cm.