Unidirectional Transmission Based on a Passive PT Symmetric Grating With a Nonlinear Silicon Distributed Bragg Reflector Cavity

Ye-Long Xu; Liang Feng; Ming-Hui Lu; Yan-eng Chen

doi:10.1109/JPHOT.2013.2295462

IEEE Photonics Journal (Jan 2014)

Unidirectional Transmission Based on a Passive PT Symmetric Grating With a Nonlinear Silicon Distributed Bragg Reflector Cavity

Ye-Long Xu,
Liang Feng,
Ming-Hui Lu,
Yan-eng Chen

Affiliations

Ye-Long Xu: <formula formulatype="inline"><tex Notation="TeX">$^{1}$</tex></formula>National Laboratory of Solid State Microstructures and Department of Materials Science and Engineering, Nanjing University , Nanjing, China
Liang Feng: <formula formulatype="inline"><tex Notation="TeX">$^{2}$</tex></formula> Department of Electrical Engineering, The State University of New York at Buffalo , Buffalo, NY, USA
Ming-Hui Lu: National Laboratory of Solid State Microstructures and Department of Materials Science and Engineering, Nanjing University , Nanjing, China
Yan-eng Chen: National Laboratory of Solid State Microstructures and Department of Materials Science and Engineering , Nanjing University, Nanjing, China

DOI: https://doi.org/10.1109/JPHOT.2013.2295462
Journal volume & issue: Vol. 6, no. 1
pp. 1 – 7

Abstract

Read online

A silicon waveguide consisting of passive parity-time (PT) symmetry optical potentials connected with a distributed Bragg reflector (DBR)-based resonator is proposed to achieve nonreciprocal waveguide transmission. The unidirectional reflectionless waveguide implementing PT symmetry is discussed by consistent coupling mode theory and finite-difference time-domain (FDTD) simulation results. Due to the high field confinement in the DBR cavity, transmission of a light pulse through the device is analyzed in the nonlinear optical regime using FDTD simulations. The combination of the nonlinear DBR cavity and the passive PT symmetric grating results in unidirectional transmission in the silicon waveguide, while still keeping the reflection minimum in the desired direction. The numerical simulation shows an extinction ratio of about 20 dB at the telecom wavelength of around 1550 nm.

Published in IEEE Photonics Journal

ISSN: 1943-0655 (Online)
Publisher: IEEE
Country of publisher: United States
LCC subjects: Technology: Engineering (General). Civil engineering (General): Applied optics. Photonics; Science: Physics: Optics. Light
Website: http://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=4563994

About the journal

Abstract

Keywords