SHIMAO LI - Academia.edu (original) (raw)

Papers by SHIMAO LI

Applied Physics Letters

Photon dimension mapping provides an efficient way to learn from each other's strengths to of... more 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) p...

arXiv (Cornell University), Dec 21, 2017

Semiconductor lasers capable of generating a vortex beam with a specific orbital angular momentum... more Semiconductor lasers capable of generating a vortex beam with a specific orbital angular momentum (OAM) order are highly attractive for applications ranging from nanoparticle manipulation, imaging and microscopy to fibre and quantum communications. In this work, an electrically pumped OAM laser operating at telecom wavelengths is fabricated by monolithically integrating an optical vortex emitter with a distributed feedback (DFB) laser on the same InGaAsP/InP epitaxial wafer. A single-step dry etching process is adopted to complete the OAM emitter, equipped with specially designed top gratings. The vortex beam emitted by the integrated laser is captured, and its OAM mode purity characterized. The electrically pumped OAM laser eliminates the external laser required by silicon-or siliconon-insulator (SOI)-based OAM emitters, thus demonstrating great potential for applications in communication systems and quantum domain.

Optical Fiber Communication Conference, 2018

We design, fabricate and demonstrate chip-scale ultra-broadband orbital angular momentum (OAM) em... more We design, fabricate and demonstrate chip-scale ultra-broadband orbital angular momentum (OAM) emitter and synthesizer on a silicon platform. The maximum purity of OAM+1 and synthesized OAM+1 and OAM-1 are 0.93 and 0.9 in telecommunication band.

Asia Communications and Photonics Conference, 2017

We demonstrate silicon photonic orbital angular momentum multiplexing devices based on concentric... more We demonstrate silicon photonic orbital angular momentum multiplexing devices based on concentric micro-ring resonator. Up to four optical beams carrying different orbital angular momentum states can be selectively excited from different input ports.

IEEE Photonics Technology Letters, 2017

We present a method to measure the orbital angular momentum (OAM) state of light by coordinate tr... more We present a method to measure the orbital angular momentum (OAM) state of light by coordinate transformation. The input OAM mode with annular shape is uniaxially compressed into a linear-shaped light, so that the upper and lower portions of OAM mode overlap to produce an interference pattern, showing easily recognizable fringes both in the near field and far field. The far-field measurement is more suitable for detecting large OAM but with the cost of additional diffractive element. The incident light can illuminate any position of the device, showing good tolerance to adjust the optical path. In a practical application, the proposed scheme can be realized only by one or two elliptical lenses, which provides a convenient and economic method for measurement of OAM state.

2016 IEEE 13th International Conference on Group IV Photonics (GFP), 2016

We demonstrate an integrated photonic orbital angular momentum beam multiplexer consisting of fou... more We demonstrate an integrated photonic orbital angular momentum beam multiplexer consisting of four nested arc waveguide gratings. Well-defined OAM mode emissions over wide bandwidth of 1-nm enables simultaneous wavelength division multiplexing and OAM multiplexing.

Conference on Lasers and Electro-Optics, 2016

We experimentally demonstrate orbital angular momentum (OAM) mode emission from a high emission e... more We experimentally demonstrate orbital angular momentum (OAM) mode emission from a high emission efficiency OAM emitter for 20 Gbit/s QPSK carrying data transmission in few-mode fiber (FMF). Two modes propagate through a 3.6km three-mode FMF with measured OSNR penalties less than 4 dB at a BER of 2e-3.

2016 IEEE 13th International Conference on Group IV Photonics (GFP), 2016

Integrated devices that emit light beams with orbital angular momentum (OAM) are becoming key com... more Integrated devices that emit light beams with orbital angular momentum (OAM) are becoming key components for wide-ranging applications. Here, we propose and demonstrate a highly directional silicon photonic vortex beam emitter based on a 3-turn Archimedean spiral adiabatic waveguide integrated with an angular grating. Such compact emitter is capable of generating vortex beams with small divergence angles and high directivity. Various order OAM modes can be selectively generated by the emitter at different wavelength with side-mode suppression ratio as large as 13.6 dB.

Applied Physics Letters

Photon dimension mapping provides an efficient way to learn from each other's strengths to of... more 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) p...

arXiv (Cornell University), Dec 21, 2017

Semiconductor lasers capable of generating a vortex beam with a specific orbital angular momentum... more Semiconductor lasers capable of generating a vortex beam with a specific orbital angular momentum (OAM) order are highly attractive for applications ranging from nanoparticle manipulation, imaging and microscopy to fibre and quantum communications. In this work, an electrically pumped OAM laser operating at telecom wavelengths is fabricated by monolithically integrating an optical vortex emitter with a distributed feedback (DFB) laser on the same InGaAsP/InP epitaxial wafer. A single-step dry etching process is adopted to complete the OAM emitter, equipped with specially designed top gratings. The vortex beam emitted by the integrated laser is captured, and its OAM mode purity characterized. The electrically pumped OAM laser eliminates the external laser required by silicon-or siliconon-insulator (SOI)-based OAM emitters, thus demonstrating great potential for applications in communication systems and quantum domain.

Optical Fiber Communication Conference, 2018

We design, fabricate and demonstrate chip-scale ultra-broadband orbital angular momentum (OAM) em... more We design, fabricate and demonstrate chip-scale ultra-broadband orbital angular momentum (OAM) emitter and synthesizer on a silicon platform. The maximum purity of OAM+1 and synthesized OAM+1 and OAM-1 are 0.93 and 0.9 in telecommunication band.

Asia Communications and Photonics Conference, 2017

We demonstrate silicon photonic orbital angular momentum multiplexing devices based on concentric... more We demonstrate silicon photonic orbital angular momentum multiplexing devices based on concentric micro-ring resonator. Up to four optical beams carrying different orbital angular momentum states can be selectively excited from different input ports.

IEEE Photonics Technology Letters, 2017

We present a method to measure the orbital angular momentum (OAM) state of light by coordinate tr... more We present a method to measure the orbital angular momentum (OAM) state of light by coordinate transformation. The input OAM mode with annular shape is uniaxially compressed into a linear-shaped light, so that the upper and lower portions of OAM mode overlap to produce an interference pattern, showing easily recognizable fringes both in the near field and far field. The far-field measurement is more suitable for detecting large OAM but with the cost of additional diffractive element. The incident light can illuminate any position of the device, showing good tolerance to adjust the optical path. In a practical application, the proposed scheme can be realized only by one or two elliptical lenses, which provides a convenient and economic method for measurement of OAM state.

2016 IEEE 13th International Conference on Group IV Photonics (GFP), 2016

We demonstrate an integrated photonic orbital angular momentum beam multiplexer consisting of fou... more We demonstrate an integrated photonic orbital angular momentum beam multiplexer consisting of four nested arc waveguide gratings. Well-defined OAM mode emissions over wide bandwidth of 1-nm enables simultaneous wavelength division multiplexing and OAM multiplexing.

Conference on Lasers and Electro-Optics, 2016

We experimentally demonstrate orbital angular momentum (OAM) mode emission from a high emission e... more We experimentally demonstrate orbital angular momentum (OAM) mode emission from a high emission efficiency OAM emitter for 20 Gbit/s QPSK carrying data transmission in few-mode fiber (FMF). Two modes propagate through a 3.6km three-mode FMF with measured OSNR penalties less than 4 dB at a BER of 2e-3.

2016 IEEE 13th International Conference on Group IV Photonics (GFP), 2016

Integrated devices that emit light beams with orbital angular momentum (OAM) are becoming key com... more Integrated devices that emit light beams with orbital angular momentum (OAM) are becoming key components for wide-ranging applications. Here, we propose and demonstrate a highly directional silicon photonic vortex beam emitter based on a 3-turn Archimedean spiral adiabatic waveguide integrated with an angular grating. Such compact emitter is capable of generating vortex beams with small divergence angles and high directivity. Various order OAM modes can be selectively generated by the emitter at different wavelength with side-mode suppression ratio as large as 13.6 dB.