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All-optical regeneration based on highly nonlinear photonic crystal fiber

Frontiers of Optoelectronics 2008年第Z1期1卷 79-84页

作者： Yongzhao XU Yanfen WEI Xiaomin REN Xia ZHANG Yongqing HUANG Department of Electronic Engineering Dongguan University of Technology Tianjin Mobile Corporation Company Key Laboratory of optical Communication and Lightwave Technologies Ministry of Education Beijing University of Posts and Telecommunications

An all-optical regeneration based on selfphase modulation in a highly nonlinear photonic crystal fiber is proposed. The dispersion and nonlinearity properties of a series of photonic crystal fibers are analyzed, and the results show that the nonlinearity coefficient is closely related to the structure of the *** this paper, the nonlinearity coefficient is increased by reducing the effective mode area, and a highly nonlinear photonic crystal fiber with a large air-filling fraction is used as nonlinearity medium in optical regeneration. The numerical results show that good optical regeneration results can be obtained by using a relatively short fiber length due to the high nonlinearity of the fiber. The input peak power launched into the photonic crystal fiber and the parameters of the filter have much influence on optical regeneration. To achieve good optical regeneration, those parameters need to meet certain ***, the transfer characteristic of the regenerator is also discussed. By adjusting the input peak power and filter parameters, the regenerator can deal with input pulses of different pulse widths.

关键词： fiber optics and optical communications photonic crystal fiber optical regeneration self-phase modulation

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4×4 multiple-input multiple-output coherent microwave photonic link with optical independent sideband and optical orthogonal modulation

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Chinese optics Letters 2017年第1期15卷 33-39页

作者： Xiang Chen Jianping Yao Microwave Photonics Research Laboratory School of Electrical Engineering and Computer Science University of Ottawa Ottawa Ontario K1N 6N5 Canada

A 4× 4 multiple-input multiple-output coherent microwave photonic （MWP） link to transmit four wireless signals with an identical microwave center frequency over a single optical wavelength based on optical independent sideband （OISB） modulation and optical orthogonal modulation with an improved spectral efficiency is proposed and experimentally demonstrated. At the transmitter, the OISB modulation and optical orthogonal modulation are implemented to generate an OISB signal using a dual-parallel Mach-Zehnder modulator （DP- MZM） driven by four microwave orthogonal frequency-division multiplexing （OFDM） signals with an identical microwave center frequency. At the receiver, the OISB signal is coherently detected at a coherent receiver where a free-running local oscillator （LO） laser source is employed. Digital signal processing is then used to recover the four OFDM signals, to eliminate the phase noise from the transmitter laser source and the LO laser source, and to cancel the unstable wavelength difference between the wavelengths of the transmitter laser source and the LO laser source. Error-free transmission of three 16 quadrature amplitude modulation （16-QAM） 1 Gbps OFDM signals and one 16-QAM 1.5 Gbps OFDM signal at a microwave center frequency of 2.91 GHz over a 10 km single-mode fiber is experimentally demonstrated.

关键词： fiber optics and optical communications Radio frequency photonics Heterodyne

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Study of Temporal Thermal Response of Microfiber Bragg Grating

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Photonic Sensors 2021年第4期11卷 387-391页

作者： Changrui LIAO Tianhang YANG Jinli HAN Shenzhen Key Laboratory of Photonic Devices and Sensing Systems for Internet of Things College of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China Guangdong and Hong Kong Joint Research Centre for optical Fibre Sensors Shenzhen UniversityShenzhen 518060China

fiber Bragg grating has been successfully fabricated in the silica microfiber by the use of femtosecond laser point-by-point *** thermal response of the fabricated silica microfiber Bragg grating has been measured by the use of the CO_(2) laser thermal excitation method,and the result shows that the time constant of the microfiber Bragg grating is reduced by an order of magnitude compared with the traditional single-mode fiber Bragg grating and the measured time constant is〜21 ms.

关键词： fiber optics sensors fiber optics and optical communications fiber optics components

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Octagonal dual-concentric-core photonic crystal fiber for C-band dispersion compensation with low confinement loss

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Chinese optics Letters 2013年第14期11卷 30-32页

作者：梁文斌刘宁亮李智华陆培祥 Wuhan National Laboratory for Optoelectronics School of Physics Huazhong University of Science ~: Technology Wuhan 430074 China Key Laboratory of Fundamental Physical Quantities Measurement of Ministry of Education Huazhong University of Science and Technology Wuhan 430074 China

A novel kind of octagonal dual-concentric-core photonic crystal fiber （PCF） is calculated with the finite element method （FEM） and proposed for broadband compensation. In order to realize highly negative dispersion, the hole diameter of the second ring is reduced relative to conventional PCFs. Numerical simulation results show that when the diameters of large holes and small holes are 0.77 pm and 0.5 #m, respectively, and the pitch of the adjacent rings is 1.1 μm, the negative dispersion can achieve about 840 ***^-***^-1 at 1 550 nm and the dispersion slope can match with single mode fiber （SMF-28） perfectly. This PCF can compensate the positive dispersion and also its slope of about 50 times its length of SMF-28 fiber, which is suitable for C-band optical fiber telecommunication as a dispersion compensation fiber.

关键词： 060.0060 fiber optics and optical communications 220.0220 optical design and fabrication 230.0230 optical devices

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Switchable dual-wavelength erbium-doped fiber laser based on polarization-maintaining fiber Sagnac loop mirror and fiber Bragg gratings

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Chinese optics Letters 2012年第B06期10卷 43-45页

作者：许鸥冯素春 Faculty of information engineering Guangdong University of Technology Guangzhou 510006 China Institute of Lightwave Technology Key Lab of All Optical Network ~ Advanced Telecommunication Network of EMC Beijing Jiaotong University Beijing 100044 China

A switchable dual-wavelength erbium-doped fiber laser is proposed and experimentMly demonstrated, which is constructed by a polarization-maintaining fiber Sagnac loop mirror （PMF-SLM） and two FBGs with different wavelengths. Wavelength switching operation is achieved by properly adjusting the polariza~ tion controller （PC） in the PMF-SLM. Stable single- or dual-wavelength lasing output can be realized. The maximum amplitude variation for every lasing wavelength is less than 1 dB, and the signal-to-amplified spontaneous emission （ASE） ratio is about 35 dB.

关键词： 060.0060 fiber optics and optical communications 140.0140 Lasers and laser optics 230.0230 optical devices

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