Li Wei

Wilfrid Laurier University

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John W. Y. Lit

Wilfrid Laurier University

Da-Peng Zhou

Dalian University of Technology

Wing‐Ki Liu

University of Waterloo

Jian Wu

Southern Medical University

Yan Li

Beijing University of Posts and Telecommunications

Bo Dong

Shenzhen Technology University

Xiaobin Hong

Wuhan Sports University

Qinghe Mao

University of Science and Technology of China

Anum Khattak

Wilfrid Laurier University

Sujuan Feng

Qufu Normal University

Cooperative Institutions

Beijing University of Posts and Telecommunications

Chinese Academy of Sciences

Huazhong University of Science and Technology

State Key Laboratory of Information Photonics and Optical Communications

Fiberhome Technology Group (China)

Wuhan National Laboratory for Optoelectronics

Peking University

Wilfrid Laurier University

Harbin Institute of Technology

Nanyang Technological University

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Compact passively Q-switched Er/Yb-codoped cladding pumped fiber laser

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2010)

Da-Peng Zhou Li Wei Wing‐Ki Liu

An all-fiber passively Q-switched erbium/ytterbium co-doped cladding pumped fiber laser is presented. A section of erbium/ytterbium co-doped fiber is used as both gain medium and saturable absorber, which makes the laser configuration simple and compact. By properly choosing the splitting ratio of the laser output coupler, stable Q-switching could be achieved. It has been found that the splitting ratio of the output coupler is very important for generating stable Q-switching pulses. The operation range of stable Q-switching is different for different lengths of the erbium/ytterbium co-doped fiber. Self-mode-locking effect is also observed accompanying with the Q-switched pulses. The characteristics of the laser output against the pump power and the splitting ratio of the output coupler are studied in detail.

Ytterbium

Erbium

Cladding (metalworking)

Output coupler

Q-switching

Double-clad fiber

10.1117/12.872146

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Citations (3)

Investigation of Resonant-Cavity-Enhanced GeSn Photodetectors in Short-Wavelength Infrared Regime

Qimiao Chen Hao Zhou Yi‐Chiau Huang Kwang Hong Lee Li Wei

GeSn with a 10% Sn content for resonant-cavity-enhanced photodetectors (RCE PDs) was grown and the RCE PDs was designed for 2000-nm operation, exhibiting a quantum efficiency up to 91%. This work shows RCE GeSn PDs can be a promising route toward high-response SWIR detection.

Resonant cavity

Quantum Efficiency

10.1109/group4.2019.8853888

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Citations (3)

Design of periodic bandpass filters based on a multi-reflector Gires–Tournois resonator for DWDM systems

Optics Communications (2005)

Li Wei John W. Y. Lit

Reflector (photography)

Passband

10.1016/j.optcom.2005.06.051

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Citations (3)

Wavelength continuously tunable and wavelength spacing variable comb filter based on a High-Birefringence fiber loop mirror

Optics & Laser Technology (2024)

Xiaofang Xu Anum Khattak Li Wei

Comb filter

Waveplate

10.1016/j.optlastec.2024.110777

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Citations (0)

Mitigate the impact of transmitter finite extinction ratio using K-means clustering algorithm for 16QAM signal

Optics Communications (2017)

Miao Yu Yan Li Tong Shu Yifan Zhang Xiaobin Hong

Extinction ratio

SIGNAL (programming language)

10.1016/j.optcom.2017.07.016

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Citations (3)

Separation theory of the incident and scattered sound fields in spherical coordinate

中国科学(E辑:技术科学)(英文版) (2007)

Li Wei

By the spherical wave spectrum transform,the sound pressures on the two spherical surfaces surrounding the scattering objects with arbitrarily-shaped sur-faces are decomposed into spherical wave components that propagate in a known manner,the relationships between the spherical wave components of the same order on the two spherical surfaces are established by the wave field extrapolation theorem,and the formula of the separation theory in the spherical coordinate is established in the wave-number domain. After separating the scattered pressure,the total scattered field can be obtained by holographic reconstruction and predic-tion. In order to overcome the instability of acoustic inverse problem,a new wave-number domain filter technique is proposed. It is proved that,as long as the two holographic spherical surfaces are taken to be close enough,the singularity of the separation formula can be avoided. The results of numerical simulation dem-onstrate the feasibility and validity of the separation theory.

Spherical wave

Spherical shell

Acoustic Holography

Wavenumber

Source

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Tunable Passively $Q$-switched Erbium-Doped Fiber Laser With Carbon Nanotubes as a Saturable Absorber

IEEE Photonics Technology Letters (2009)

Da-Peng Zhou Li Wei Bo Dong Wing‐Ki Liu

An all-fiber tunable passively Q-switched erbium-doped fiber (EDF) laser is presented. Saturable absorbers are constructed by optically driven deposition of single-wall carbon nanotubes on fiber connectors. A low pump threshold of 11.1 mW is achieved. Self-mode-locking effect is also observed, and it could be suppressed by splicing an extra unpumped EDF into the laser ring cavity. The laser can be tuned by applying axial strain on the fiber Bragg grating which serves as a narrowband external mirror of the cavity.

Saturable absorption

Fiber Bragg Grating

Erbium

Ring laser

10.1109/lpt.2009.2035325

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Citations (253)

An L-band widely tunable erbium-doped fiber laser with all-fiber structure

Laser Physics (2013)

Li Wei Li Liu Sujuan Feng Qinghe Mao

We report on a widely tunable L-band erbium-doped fiber ring laser with the exploitation of an all-fiber Lyot fiber. The all-fiber Lyot filter is constructed from a polarizer, a short section of polarization-maintaining fiber and polarization controllers. Theoretical analysis shows that the laser oscillating wavelength can be tuned by changing the polarization rotation angle. By adjusting the polarization controllers, the laser can be tuned continuously over the full L band (1559.84–1603.19 nm) with a tunability of 43 nm, a side-mode suppression ratio over 44 dB, and power uniformity better than 1.2 dB. The simple and efficient tuning mechanism allows the building of inexpensive widely tunable fiber lasers with all-fiber structure.

Polarizer

Erbium

10.1088/1054-660x/23/5/055102

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Citations (7)

Tunable mode rotator for space-division multiplexing based on a few mode-polarization maintaining fiber

Applied Optics (2016)

Xiaobin Hong Xinglin Zeng Yan Li Qi Mo Yongjie Tian

In this paper, a fiber-based tunable mode rotator is proposed and demonstrated by using the few mode-polarization maintaining fiber (FM-PMF). The mode birefringence in the FM-PMF causes phase difference between two orthogonal degenerate modes. With rotating the FM-PMF segment and getting a variation of aligning angle between the injected LP11 (LP21) mode axis and FM-PMF axis, another intended LP11 (LP21) mode with a certain orientation can be controllably generated at the FM-PMF output.

Mode volume

Mode (computer interface)

10.1364/ao.55.009360

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Citations (11)

Tunable graphene Q-switched erbium-doped fiber laser with suppressed self-mode locking effect

Applied Optics (2012)

Da-Peng Zhou Li Wei Wing‐Ki Liu

Self-mode locking effect in a wideband tunable graphene-based passively Q-switched erbium-doped fiber laser has been observed experimentally. Q-switching is achieved by using graphene as a saturable absorber, while a tunable bandpass filter with a narrow bandwidth is used to obtain wideband tunability. We propose to suppress the modulation on each pulse from self-mode locking by introducing three subring resonators constructed with three 3 dB couplers into the laser ring cavity. Moreover, the laser output characteristics with respect to pump power are studied in detail. A stable Q-switched erbium-doped fiber laser with a tunable range from 1522 nm to 1568 nm is demonstrated experimentally.

Mode-Locking

Erbium

Self-phase modulation

10.1364/ao.51.002554

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Citations (33)