High-speed spatial light modulation based on photon dimension mapping assisted by an integrated mode multiplexer

• Main Authors: Cai, X. (Author), Chen, S. (Author), Gao, S. (Author), Li, S. (Author), Liu, J. (Author), Tan, H. (Author), Wang, J. (Author), Zheng, S. (Author), Zhu, L. (Author)
• Format: Article
• Language: English
• Published: American Institute of Physics Inc. 2022
• Subjects: Bit error rate; Encoding (symbols); Encoding informations; High Speed; Information transfers; Learn+; Light modulation; Light modulators; Mapping; Multiplexing equipment; Optical resonators; Optical signal to noise ratio; Orbital angular momentum; Photons; Signal encoding; Signal to noise ratio; Signal-to-noise ratio penalties; Silicon chip; Spatial light modulation; Spatial modes
• Online Access: View Fulltext in Publisher
• ISBN: 00036951 (ISSN)
• DOI: 10.1063/5.0076652

Photon dimension mapping provides an efficient way to learn from each other's strengths to offset their own weaknesses in a variety of applications. By mapping the conventional amplitude modulation to spatial mode modulation and employing an integrated orbital angular momentum (OAM) mode multiplexer, we present an integrated approach to break the spatial light modulation speed limit and implement the high-speed silicon-chip-assisted OAM encoding information transfer. The silicon chip is formed by a multi-mode micro-ring resonator with angular grating embedded in the inner wall and two bus waveguides with different widths for OAM mode multiplexing. Using the fabricated silicon-based OAM mode multiplexer (OAM+1 and OAM-14), we demonstrate 15-Gbit/s amplitude-to-OAM modulation mapping in the experiment, which is far beyond the achievable low-speed OAM encoding information transfer with a conventional spatial light modulator (SLM). The observed optical signal-to-noise ratio (OSNR) penalties at a bit-error rate (BER) of 2 × 10-3 are about 1.0 dB, and the OSNR penalty is improved by about 1.4 dB with the balanced detection. The demonstrations with favorable performance may open up added opportunities in more spatial-mode-enabled applications by photon dimension mapping with silicon chips. © 2022 Author(s).