Ultra-broadband and compact polarizing beam splitter in silicon photonics
Abstract
We design and experimentally demonstrate a polarizing beam splitter (PBS) on a silicon-on-insulator (SOI) platform based on an asymmetric directional coupler. The asymmetric directional coupler consists of a regular strip waveguide and a sub-wavelength grating (SWG) waveguide. Engineering the waveguide dispersion via SWG, the phase-matching condition can be satisfied for TM polarization over a broad bandwidth when the waveguide dimensions are optimized. The coupling region of the realized PBS is ∼7.2 µm long. For the fabricated PBS, the polarization extinction ratio (PER) is 10–45 dB and the insertion loss is 0.3–2.5 dB for TM polarization while the PER is 14–22 dB and the insertion loss is < 0.6 dB for TE polarization when operating in the wavelength range of 1460 –1610 nm.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Mar 05, 2020
- Source ID
- 10.1364/osac.385546
Entities
People
- Arka Majumdar
- Fang Zhang
- Jiajiu Zheng
- Peipeng Xu
- Weixi Liu
- Yipeng Song
Organizations
- Air Force Office of Scientific Research
- M J Murdock Charitable Trust
- National Institutes of Health
- National Natural Science Foundation of China
- National Science Foundation
- Ningbo University
- Washington Research Foundation
- Zhejiang Provincial Natural Science Foundation