silica-based planar waveguide spatial heterodyne spectrometer incorporating a phase shift scheme

2017 Fiscal Year Final Research Report

• Project/Area Number: 15K04689
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Optical engineering, Photon science
• Research Institution: Gunma University
• Principal Investigator: TAKADA Kazumasa 群馬大学, 大学院理工学府, 教授 (20359590)
• Research Collaborator: OKAMOTO Katsunari ; UDA Chikara ; SAITOH Katsuhumi ; YAMAGUCHI Kohei
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: 光導波路 / 光集積回路 / 分光器 / フーリエ変換 / ハイブリッドカプラ

Outline of Final Research Achievements

We fabricated a silica-based spatial heterodyne spectrometer incorporating 120° optical hybrid couplers as the output couplers of the individual Mach-Zehnder interferometers (MZIs) The free spectral range was 640 GHz We retrieved a narrow-band light whose width was 1 nm with the spectrometer. The rising and falling parts of the retrieved spectrum agreed well with the actual parts. The deviations of the signals from the actual signals on the flat top were within ±4% and the background noise peaks were 8～17%. We also retrieved the spectrum of a DFB laser light. The sepctral width was 14 GHz, which was the spectral resolution of the spectrometer and agreed with the designed value. Since a　feature of the spectrometer is that the entire free spectral range is available for the spectral retrieval and the spectrum is derived simply without the use of an interpolation technique, our spectrometer will play an important role in developing the spectrometer to a commercially viable level.

Free Research Field

光計測