Open AccessThermo-optical properties of silicon nitride Mach-Zehnder interferometer for the on-chip quantum random number generator
Author(s) -
A. Prokhodtsov,
Vadim Kovalyuk,
Pengli An,
Alexander Golikov,
Yu. V. Konyshev,
Roman Shakhovoy,
Violetta Sharoglazova,
Alexander Udaltsov,
Y. V. Kurochkin,
Gregory Goltsman
Publication year - 2021
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/2086/1/012164
Subject(s) - interferometry , mach–zehnder interferometer , silicon nitride , materials science , optoelectronics , waveguide , wavelength , chip , optics , silicon , physics , telecommunications , computer science
Here we study the thermo-optical properties of an on-chip silicon nitride Mach-Zehnder interferometer (MZI). The spectral shift of the MZI is associated with a change in the chip temperature. This can be explained by a change in the splitting ratio of the directional couplers, as well as a significant change in phase difference between waveguide arms. We experimentally found a phase shift of 2π when heated by 1.67 °C and changes in resonant wavelength at different temperatures ( dλ/dT ) equal 12.0 pm/°C, theoretically obtained a formula for an arbitrary splitting ratio of the directional couplers in an MZI, and determined the temperature stability required to the device operation inside a quantum cryptography system.