Xinhuan Feng

Jinan University

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Bai‐Ou Guan

Jinan University

Xudong Wang

University of Chinese Academy of Sciences

Yuan Cao

Jinan University

P. K. A. Wai

Hong Kong Polytechnic University

Erwin H. W. Chan

Charles Darwin University

Shuzhong Yuan

Yangzhou University

Feng Li

Xi'an Jiaotong University

Chao Lü

Hong Kong Polytechnic University

Xiaoyi Dong

Kunming University of Science and Technology

Hwa‐Yaw Tam

Hong Kong Polytechnic University

Cooperative Institutions

Jinan University

Nankai University

Chinese Academy of Sciences

Sichuan University

Hong Kong Polytechnic University

Sun Yat-sen University

Huazhong University of Science and Technology

University of Chinese Academy of Sciences

South China Normal University

University of Science and Technology of China

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Microwave photonic bandpass filter based on phase modulation and Hi-Bi FBG-FP cavity

26th Optoelectronics and Communications Conference (2012)

Xinhuan Feng Ruichen Tao Yuan Cao Zhaohui Li Jianping Li

A microwave photonic single bandpass filter is proposed and successfully demonstrated. The principle is based on the Hi-Bi FBG-FP cavity transmission to break the amplitude balance of PM sidebands and achieve effective PM-AM conversion.

Modulation (music)

Microwave cavity

Microwave transmission

10.1109/oecc.2012.6276559

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Citations (0)

Switchable multiwavelength erbium-doped fiber laser with a multimode fiber Bragg grating and photonic crystal fiber

IEEE Photonics Technology Letters (2006)

Xinhuan Feng Hwa‐Yaw Tam P. K. A. Wai

A switchable multiwavelength erbium-doped fiber laser with a multimode FBG and highly nonlinear PCF is demonstrated.Stable five-wavelength operation with 0.8 nm spacing was achieved.Switching between stable one-to four-wavelength operations is also demonstrated.

Fiber Bragg Grating

PHOSFOS

Erbium

10.1109/lpt.2006.873355

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Citations (50)

Synchronously pumped mode-locked Yb³⁺-doped fiber laser

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2004)

Xinhuan Feng Wande Fan Shenggui Fu Shuzhong Yuan Xiaoyi Dong

A synchronously pumped mode-locked Yetterbium-doped Fiber Laser which has the advantages of simple design and broad applications is obtained when the pump semiconductor laser current is modulated sinusoidally at the appropriate frequency. Steady pulses were obtained on harmonic mode-locked status. At the repetition rate of 623kHz,the pulse width is about 50ns,the average output power is 2.34 mW.

Ytterbium

Mode-Locking

Harmonic

Optical Pumping

10.1117/12.521938

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Citations (0)

Tunable single frequency fiber laser based on FP-LD injection locking

Optics Express (2013)

Aiqin Zhang Xinhuan Feng Minggui Wan Zhaohui Li Bai‐Ou Guan

We propose and demonstrate a tunable single frequency fiber laser based on Fabry Pérot laser diode (FP-LD) injection locking. The single frequency operation principle is based on the fact that the output from a FP-LD injection locked by a multi-longitudinal-mode (MLM) light can have fewer longitudinal-modes number and narrower linewidth. By inserting a FP-LD in a fiber ring laser cavity, single frequency operation can be possibly achieved when stable laser oscillation established after many roundtrips through the FP-LD. Wavelength switchable single frequency lasing can be achieved by adjusting the tunable optical filter (TOF) in the cavity to coincide with different mode of the FP-LD. By adjustment of the drive current of the FP-LD, the lasing modes would shift and wavelength tunable operation can be obtained. In experiment, a wavelength tunable range of 32.4 nm has been obtained by adjustment of the drive current of the FP-LD and a tunable filter in the ring cavity. Each wavelength has a side-mode suppression ratio (SMSR) of at least 41 dB and a linewidth of about 13 kHz.

Laser linewidth

Longitudinal mode

Injection locking

Laser diode

10.1364/oe.21.012874

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Citations (19)

Microwave Photonic Devices Based on Liquid Crystal on Silicon Technology

Applied Sciences (2019)

Ruiqi Zheng Erwin H. W. Chan Xudong Wang Xinhuan Feng Bai‐Ou Guan

This paper reviews the recent developments in microwave photonic devices based on liquid crystal on silicon (LCOS) technology. The operation principle, functions and important specifications of an LCOS based optical processor are described. Three microwave photonic devices, which are microwave photonic notch filters, phase shifters and couplers, reported in the past five years are focused on in this paper. In addition, a new multi-function signal processing structure based on amplitude and phase control functions in conjunction with a power splitting function in a commercial LCOS based optical processor is presented. It has the ability to realize multiple time -shifting operations and multiple frequency-independent phase shifting operations at the same time and control multiple RF signal amplitudes, in a single unit. The results for the new multi-function microwave photonic signal processor demonstrate multiple tunable true time delay and phase shifting operations with less than 3 dB amplitude variation over a very wide frequency range of 10 to 40 GHz.

SIGNAL (programming language)

10.3390/app9020260

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Citations (14)

Multiwavelength erbium-doped fiber laser using a moiré Bragg grating in polarization-maintaining fiber

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2005)

Xinhuan Feng Yange Liu Yao Li Shuzhong Yuan Guiyun Kai

A multi-wavelength erbium-doped fiber laser using a Moire Bragg grating in polarization-maintaining fiber is proposed. Two Moire Bragg gratings in Polarization-maintaining fiber are respectively fabricated successfully through stretching and double, triplicate exposure method. The two gratings fabricated respectively have four and six reflection peaks and are respectively incorporated in the linear erbium-doped fiber laser cavities to perform mode-selection and output coupler functions. The proposed laser can be made to operate in simultaneous four-wavelength or six-wavelength operations when the EDF is cooled in liquid nitrogen (77K).

Fiber Bragg Grating

PHOSFOS

Erbium

Long-period fiber grating

10.1117/12.568983

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Citations (1)

JPEG image compression algorithm analysis and local optimization

Xing Wang Xinhuan Feng Nianfeng He Qilong Jia Ying Zou

The purpose of this paper is to analyze and further optimize the JPEG image compression algorithm. First we analysis of JPEG image compression algorithm to achieve the specific methods with the advantages and disadvantages, at the same time, in the algorithm module in the sending, the output of a new data transfer mode was developed to reduce the error rate and enhance perform well in the data transfer rate based on the algorithm local optimization. In the end, we proved that the new data transfer mode can efficiently improve the data transfer rate and reduce the error rate through an experiment.

JPEG

Data compression ratio

Lossless JPEG

JPEG 2000

10.1109/icams.2010.5553016

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Citations (8)

Pulse-Amplitude Equalization in a Rational Harmonic Mode-Locked Fiber Laser Using Nonlinear Modulation

IEEE Photonics Technology Letters (2004)

Xinhuan Feng Yu Liu Shuzhong Yuan G. Kai Weicheng Zhang

In this letter, a simple technique for the pulse-amplitude equalization of high repetition rate pulses generated from a rational harmonic mode-locked fiber ring laser was demonstrated. The principle is based on nonlinear modulation of the modulator and a theoretical explanation based on time-domain analysis was given. Amplitude equalized short pulses up to the seventh rational harmonic mode-locking were obtained with an optimum bias level and modulation depth of the modulator, which agrees well with the simulation result and demonstrates the efficiency of this method.

Modulation (music)

Harmonic

Mode-Locking

10.1109/lpt.2004.831062

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Citations (19)

High Conversion Efficiency Photonic Microwave Mixer With Image Rejection Capability

IEEE photonics journal (2016)

Jianglin Zhang Erwin H. W. Chan Xudong Wang Xinhuan Feng Bai‐Ou Guan

A new photonic microwave image rejection mixer that can achieve high conversion efficiency and has a wide bandwidth is presented. It is based on an integrated dual-parallel Mach-Zehnder modulator (MZM) with a 90° polarization rotator on one branch of the modulator. The two modulators connected in parallel are biased at the minimum transmission point to generate two sets of orthogonally polarized radio frequency (RF) and local oscillator (LO) modulation sidebands with the optical carrier being suppressed. Suppressing the optical carrier enables high RF and LO modulation sidebands to be detected by a photodiode without saturation. The LO modulation index is also designed to obtain a high conversion efficiency mixing operation. Experimental results demonstrate frequency downconversion with an image rejection function and a high conversion efficiency of > $-$ 5 dB over a wide 3 to 20 GHz frequency range. A technique for compensating the effect of coupler amplitude and phase imbalance to obtain a high image rejection ratio is also experimentally demonstrated.

Image response

Photodiode

Radio transmitter design

Modulation index

Modulation (music)

Frequency mixer

10.1109/jphot.2016.2592327

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Citations (42)

Photonics based Microwave Frequency Shifter for Doppler Shift Compensation in High-Speed Railways

Ruiqi Zheng Yujia Kong Erwin H. W. Chan Yuan Cao Xudong Wang

A photonic signal processor for removing the Doppler effect in high-speed railway mobile communication is simulated with results agree with theory. It is based on a time stretch/compress system to shift a microwave signal frequency.

SIGNAL (programming language)

Doppler frequency

10.1364/cleopr.2018.f2c.4

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Citations (1)