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【Weihong Shen】
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Research Articles
High-speed silicon microring modulator at the 2 µm waveband with analysis and observation of optical bistability
Weihong Shen
1,2†
Gangqiang Zhou
2†
Jiangbing Du
1,2,*
Linjie Zhou
2
[ ... ]
Zuyuan He
2,3,4
Author Affiliations
Abstract
1
Peng Cheng Laboratory, Shenzhen 518055, China
2
State Key Laboratory of Advanced Optical Communication Systems and Networks, Shanghai Jiao Tong University, Shanghai 200240, China
3
Department of Electronic and Information Engineering, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China
4
e-mail: zuyuanhe@sjtu.edu.cn
Recently, significantly raised interests have emerged for the 2 µm waveband as an extended new window for fiber optic communication. Much research progress has been made on the photonic integrated circuits for the 2 µm waveband, especially on the CMOS-compatible silicon-on-insulator wafer. In this work, a silicon integrated microring modulator (MRM) with record high-speed performances at the 2 µm waveband was demonstrated. An L-shaped PN junction was specially designed for 2 µm to achieve a high modulation efficiency with
V
π
L
of
0.85
V
·
cm
. The measured 3 dB bandwidth is 18 GHz, supporting up to 50 Gbps signaling at 2 µm. Additionally, optical bistability induced by the thermo-optical effect and nonlinear effects was analyzed theoretically and observed experimentally in the 2 µm MRM for the first time to our knowledge. Nonlinear coupled mode theory and the Runge–Kutta method were used to simulate the behaviors of bistability in the 2 µm MRM. The simulation and experimental results indicate that, when the MRM is launched by a high optical power, the distorted resonant spectrum under an optical bistable state deteriorates the modulation efficiency and signal performances. This work breaks the record of high-speed silicon MRM at 2 µm, drawing a promising prospect for the silicon photonic integration and high-speed interconnection at the 2 µm waveband, and it provides the referenceable analysis of optical bistability, which guides the design and experimental investigation of 2 µm MRM.
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Full Text
Photonics Research
2022, 10(3): 03000A35
Integrated Optics
Silicon mode-loop Mach-Zehnder modulator with L-shaped PN junction for 0.37 V·cm
V
π
L
high-efficiency modulation
Jiacheng Liu
1†
Gangqiang Zhou
1†
Jiangbing Du
1,2,*
Weihong Shen
1
[ ... ]
Zuyuan He
1,2
Author Affiliations
Abstract
1
State Key Laboratory of Advanced Optical Communication Systems and Networks, Shanghai Jiao Tong University, Shanghai 200240, China
2
Peng Cheng Laboratory, Shenzhen 518055, China
Optical signaling without a high voltage driver for electric-optic modulation is in high demand to reduce power consumption, packaging complexity, and cost. In this work, we propose and experimentally demonstrate a silicon mode-loop Mach–Zehnder modulator (ML-MZM) with record-high modulation efficiency. We used a mode-loop structure to recycle light twice in the phase shifter. With an L-shaped PN junction, a comparably large overlap between the PN junction and optical modes of both
TE
0
and
TE
1
was achieved to lower the driving voltage or decrease the photonic device size. Proof-of-concept high-efficiency modulation with low
V
π
L
of
0.37
V
·
cm
was obtained. Subvoltage
V
π
can be realized with a millimeter’s length phase shifter by this scheme, which makes the realization of CMOS-compatible driverless modulation highly possible. 40 Gb/s signaling with a bit error rate below the 7% forward-error-correction threshold was then demonstrated with the fabricated ML-MZM, indicating great potential for high-speed optical communication.
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Photonics Research
2022, 10(1): 01000214
Integrated Optics
Mode division multiplexing: from photonic integration to optical fiber transmission [Invited]
Download:877次
Jiangbing Du
*
Weihong Shen
Jiacheng Liu
Yufeng Chen
[ ... ]
Zuyuan He
**
Author Affiliations
Abstract
State Key Laboratory of Advanced Optical Communication Systems and Networks, Shanghai Jiao Tong University, Shanghai 200240, China
To overcome the capacity crunch of optical communications based on the traditional single-mode fiber (SMF), different modes in a few-mode fiber (FMF) can be employed for mode division multiplexing (MDM). MDM can also be extended to photonic integration for obtaining improved density and efficiency, as well as interconnection capacity. Therefore, MDM becomes the most promising method for maintaining the trend of “Moore’s law” in photonic integration and optical fiber transmission. In this tutorial, we provide a review of MDM works and cutting-edge progresses from photonic integration to optical fiber transmission, including our recent works of MDM low-noise amplification, FMF fiber design, MDM Si photonic devices, and so on. Research and application challenges of MDM for optical communications regarding long-haul transmission and short reach interconnection are discussed as well. The content is expected to be of important value for both academic researchers and industrial engineers during the development of next-generation optical communication systems, from photonic chips to fiber links.
mode division multiplexing
photonic integration
few-mode fiber
optical transmission
optical interconnection
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Chinese Optics Letters
2021, 19(9): 091301
Silicon Photonics
High-speed silicon photonic Mach–Zehnder modulator at 2 μm
Download:506次
Xi Wang
1†
Weihong Shen
2†
Wenxiang Li
1
Yingjie Liu
1
[ ... ]
Ke Xu
1,4,*
Author Affiliations
Abstract
1
Department of Electronic & Information Engineering, Harbin Institute of Technology, Shenzhen 518055, China
2
State Key Laboratory of Advanced Optical Communication Systems and Networks, Shanghai Jiao Tong University, Shanghai 200240, China
3
e-mail: dujiangbing@sjtu.edu.cn
4
e-mail: kxu@hit.edu.cn
Recently, 2-μm wave band has gained increasing interest due to its potential application for next-generation optical communication. But the development of 2-μm optical communications is substantially hampered by the modulation speed due to the device bandwidth constraints. Thus, a high-speed modulator is highly demanded at 2 μm. Motivated by this prospect, we demonstrate a high-speed silicon Mach–Zehnder modulator for a 2-μm wave band. The device is configured as a single-ended push–pull structure with waveguide electrorefraction via the free carrier plasma effect. The modulator was fabricated via a multiproject wafer shuttle run at a commercial silicon photonic foundry. The modulation efficiency of a single arm is measured to be
1.6
V
·
cm
. The high-speed characterization is also performed, and the modulation speed can reach 80 Gbit/s with 4-level pulse amplitude modulation (PAM-4) formats.
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Photonics Research
2021, 9(4): 04000535
Fiber Optics and Optical Communications
Improved optical coupling based on a concave cavity lens fabricated by optical fiber facet etching
Download:732次
Kanglin Li
Jiangbing Du
*
Weihong Shen
Jiacheng Liu
Zuyuan He
**
Author Affiliations
Abstract
State Key Laboratory of Advanced Optical Communication Systems and Networks, Shanghai Jiao Tong University, Shanghai 200240, China
We report a low-fabrication-complexity and wideband fiber lens, which is formed by fiber facet etching and filling high refractive index UV adhesive. The optical field can be significantly shrunk by the facet lens so as to obtain improved optical coupling. Numerical simulations were carried out for different coupling conditions, on both fundamental mode and high-order mode, for a nine-mode fiber. The fundamental mode area can be reduced from 152.17 to
12.57
μm
2
, and the coupling loss between the fiber lens and a photonic waveguide can be reduced to
-
2.9
dB
with over 1000 nm 3 dB bandwidth.
fiber lens
optical coupling
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Chinese Optics Letters
2021, 19(5): 050602
Integrated Optics
Chalcogenide glass photonic integration for improved 2 μm optical interconnection
Download:647次
Weihong Shen
1†
Pingyang Zeng
2†
Zelin Yang
2
Di Xia
2
[ ... ]
Zhaohui Li
2,4,6
Author Affiliations
Abstract
1
State Key Laboratory of Advanced Optical Communication Systems and Networks, Shanghai Jiao Tong University, Shanghai 200240, China
2
State Key Laboratory of Optoelectronic Materials and Technologies, School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou 510275, China
3
Department of Electronic and Information Engineering, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China
4
Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519000, China
5
e-mail: zhangbin5@mail.sysu.edu.cn
6
e-mail: lzhh88@mail.sysu.edu.cn
In this work, on-chip chalcogenide glass photonic integrations with several fundamental photonic building blocks are designed and fabricated based on the
As
2
S
3
platform for improved 2 μm optical interconnection, achieving a broadened wavelength bandwidth and improved fabrication tolerance. A 600 nm thick
As
2
S
3
strip waveguide has low propagation loss of 1.447 dB/cm at 2 μm. Broadband vertical coupling is realized by a grating coupler with 4.3 dB coupling loss. A Bragg grating filter, power splitter, Mach–Zander interferometer, and mode converter for on-chip mode division multiplexing (MDM) are also reported at 2 μm with reliable performances. Finally, a record high MDM optical interconnection capacity of
3
×
80
Gbps
at 2 μm is experimentally demonstrated based on the proposed
As
2
S
3
chip, drawing promising prospects for future photonic integration and high-speed interconnection at the 2 μm waveband.
PDF全文
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Photonics Research
2020, 8(9): 09001484
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