Journal
APPLIED PHYSICS LETTERS
Volume 111, Issue 2, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4992112
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Funding
- JSPS KAKENHI Grant [JP26286067, JP16H04379]
- Grants-in-Aid for Scientific Research [17H02803, 16H04379] Funding Source: KAKEN
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We demonstrate on-chip octave-spanning supercontinuum (SC) generation with a Si-wire waveguide (SWG). We precisely controlled the SWG width so that the group velocity becomes flat over a wide wavelength range. By adjusting the SWG length, we could reduce the optical losses due to two-photon absorption and pulse propagation. In addition, for efficient coupling between the laser pulse and waveguide, we fabricated a two-step inverse taper at both ends of the SWG. Using a 600-nm-wide SWG, we were able to generate a broadband SC spectrum at wavelengths from 1060 to 2200 nm at a -40 dB level with only 50-pJ laser energy from an Er-doped fiber laser oscillator. We found that we can generate an on-chip broadband SC spectrum with an SWG with a length even as small as 1.7 mm. Published by AIP Publishing.
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