Open AccessIntegrated photonic high extinction short and long pass filters based on lateral leakage
Author(s) -
Andreas Boes,
Thach G. Nguyen,
Lin Chang,
John E. Bowers,
Guanghui Ren,
Arnan Mitchell
Publication year - 2021
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.426442
Subject(s) - optics , photonics , lithium niobate , wavelength , photonic integrated circuit , extinction ratio , materials science , leakage (economics) , optical filter , waveguide , optoelectronics , physics , economics , macroeconomics
In this contribution we present a new approach to achieve high extinction short and long pass wavelength filters in the integrated photonic platform of lithium niobate on insulator. The filtering of unwanted wavelengths is achieved by employing lateral leakage and is related to the bound state in the continuum phenomenon. We show that it is possible to control the filter edge wavelength by adjusting the waveguide dimensions and that an extinction of hundreds of dB/cm is readily achievable. This enabled us to design a pump wavelength suppression of more than 100 dB in a 3.5 mm long waveguide, which is essential for on-chip integration of quantum-correlated photon pair sources. These findings pave the way to integrate multi wavelength experiments on chip for the next generation of photonic integrated circuits.