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Updated: May 15, 2026
High Speed Sub-GHz Spectrometer for Brillouin Scattering Analysis
Published on: December 22, 2015
Ultra-high channel-count wavelength demultiplexer based on a Bragg reflector waveguide with large angular dispersion
Xiaodong Gu1, Toshikazu Shimada, Akihiro Matsutani
1Photonics Integration System Research Center, Precision and Intelligence Laboratory, Tokyo Institute of Technology, 4259-R2-22 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan. gu.xiaodong@ms.pi.titech.ac.jp
Abstract:
We present a new type of wavelength demultiplexers based on a Bragg reflector waveguide, which provides a large angular dispersion of 1~2°/nm. Benefiting from its large steering bandwidth and sharp divergence angles, we record a number of resolution-points (possible channel-count in demultiplexing) over 200 and 1,000 for active-type and passive-type devices, respectively. It is the highest number in various multiplexing elements ever reported. The device size is as small as a few millimeters.
