Waveguide tapering for improved parametric amplification in integrated nonlinear Si3N4 waveguides
Journal article, 2020

In this paper, we propose and numerically investigate waveguide tapering to improve optical parametric amplification in integrated nonlinear Si3N4 circuits. The phase matching condition of parametric amplification changes along the length of uniform Si3N4 waveguides, due to the non-negligible propagation loss, potentially causing peak-gain wavelength shifts of more than 20 nm. By tapering the waveguide width along propagation, we can achieve a 2.5 dB higher maximum parametric gain thanks to the improved phase matching, which can also broaden the amplification bandwidth. Therefore, the length of an optimally tapered Si3N4 waveguide can be 23% shorter than a uniform one in the case of a 3.0 dB/m propagation loss and a single continuous-wavelength pump. Quasi-continuous tapers are efficient to approximate continuous ones and might simplify the fabrication of long tapered nonlinear Si3N4 waveguides, which are promising for optical signal processing and optical communications.

Author

Ping Zhao

Chalmers, Microtechnology and Nanoscience (MC2), Photonics

Zhichao Ye

Chalmers, Microtechnology and Nanoscience (MC2), Photonics

Kovendhan Vijayan

Chalmers, Microtechnology and Nanoscience (MC2), Photonics

Corentin Naveau

Chalmers, Microtechnology and Nanoscience (MC2), Photonics

Jochen Schröder

Chalmers, Microtechnology and Nanoscience (MC2), Photonics

Magnus Karlsson

Chalmers, Microtechnology and Nanoscience (MC2), Photonics

Peter Andrekson

Chalmers, Microtechnology and Nanoscience (MC2), Photonics

Optics Express

1094-4087 (ISSN)

Vol. 28 16 23467-23477

Noiseless phase-sensitive optical amplifiers and their applications

Swedish Research Council (VR), 2016-01-01 -- 2025-12-31.

Subject Categories

Atom and Molecular Physics and Optics

Other Physics Topics

Other Electrical Engineering, Electronic Engineering, Information Engineering

DOI

10.1364/OE.389159

PubMed

32752343

More information

Latest update

3/5/2021 3