Silica-Clad Silicon Photonic Crystal Waveguides for Wideband Dispersion-Free Slow Light

We comprehensively calculated the photonic bands of the waveguide modes in practical lattice-shifted photonic crystal waveguides, which are completely cladded by silica. We assumed various lattice shifts and found that the shift of the second rows and the mixed shift of the first and third rows alon...

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Bibliographic Details
Published in:Journal of lightwave technology 2015-07, Vol.33 (14), p.3034-3040
Main Authors: Tamura, Takuya, Kondo, Keisuke, Terada, Yosuke, Hinakura, Yosuke, Ishikura, Norihiro, Baba, Toshihiko
Format: Article
Language:English
Subjects:
Lattices
Mach-Zehnder modulator
Optical waveguides
Photonic band
photonic crystal
Photonic crystals
silica clad
Silicon photonics
Slabs
Slow light
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Summary:We comprehensively calculated the photonic bands of the waveguide modes in practical lattice-shifted photonic crystal waveguides, which are completely cladded by silica. We assumed various lattice shifts and found that the shift of the second rows and the mixed shift of the first and third rows along the waveguide generate low-dispersion slow light with group indices of 34-36, which is higher than those with a conventional shift of the third rows, maintaining a wide bandwidth over 10 nm at telecom wavelengths. We fabricated the waveguides using a CMOS-compatible process and confirmed correspondence with the calculation results. We also compared 25-Gb/s photonic crystal slow light Mach-Zehnder modulators and confirmed the improvement of the modulation efficiency by second-row shifts.
ISSN:0733-8724
1558-2213
DOI:10.1109/JLT.2015.2420685