On-chip band-stop filter using multimode waveguide Bragg grating in alumina visible-light waveguides
Ryota Kitagawa (Fujitsu Limited)
Takuto Yamaguchi (Fujitsu Limited)
Naoki Fushimi (Fujitsu Limited)
Masaharu Hida (Fujitsu Limited)
Tetsuya Miyatake (Fujitsu Limited)
Toshiyuki Miyazawa (Fujitsu Limited)
Kenichi Kawaguchi (Fujitsu Limited)
Ryoichi Ishihara (TU Delft - Electrical Engineering, Mathematics and Computer Science, TU Delft - QID/Ishihara Lab, TU Delft - QuTech Advanced Research Centre)
Shintaro Sato (Fujitsu Limited)
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Abstract
Efficient elimination of unwanted light while transmitting lights with desired wavelengths is crucial in integrated photonics. We demonstrate a band-stop filter in alumina low-loss visible-light waveguides that eliminates green light while transmitting red light, applicable to diamond spin-based quantum computing. The filter employing a multimode waveguide Bragg grating (WBG) where forward TE₀ and backward TE₂ modes couple strongly, exhibits single-mode red light transmission and superior green light elimination compared to conventional TE₀–TE₀ coupling. The elimination wavelength changes linearly with the WBG period, offering tunability to target unwanted green wavelengths. A minimum transmittance of 10−3 is achieved for N = 10 000 periods. This band-stop filter is a key component for integrated photonics, especially for on-chip photonic quantum processors.
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File under embargo until 28-07-2026