Lishuang Feng

Prof. Dr. Lishuang Feng

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Academic Career Length

15Years (2012-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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29 March 2016 in Optics Letters
Verified
Journal Article
Closed access
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JWJunjie Wang
Junjie Wang
LFLishuang Feng
Lishuang Feng
QWQiwei Wang
Qiwei Wang
HJHongchen Jiao
Hongchen Jiao
XWXiao Wang
Xiao Wang
The phase difference traversal (PDT) method is proposed to suppress the backreflection-induced error in resonator integrated optic gyro (RIOG). Theoretical analysis shows that the backreflection-induced zero-bias fluctuation is periodical and sine/cosine-like. By forcing the phase difference between the CW and CCW incident light to traverse the interval [0, 2π] repeatedly and rapidly enough, the fluctuation can be low-pass filtered and, hence, the backreflection-induced error can be effectively suppressed. A RIOG apparatus is built up, with multi-wave hybrid phase modulation to traverse the phase difference and in-phase modulation to set the operation point. A short-term bias stability of 0.0055 deg/s and a long-term bias stability of 0.013 deg/s are successfully demonstrated which, to the best of our knowledge, are the best results reported to date for the buried-type silica waveguide ring resonator-based RIOG.
24 December 2014 in Applied Optics
Verified
Journal Article
Closed access
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YZYinzhou Zhi
Yinzhou Zhi
LFLishuang Feng
Lishuang Feng
JWJunjie Wang
Junjie Wang
YTYichuang Tang
Yichuang Tang
A high carrier suppression level is required to reduce the backscattering noise of a resonator integrated optic gyro (RIOG). This paper proposes a double triangular phase modulation (DTPM) technology for backscattering noise reduction. The principle of the DTPM is described and the carrier suppression of the DTPM is theoretically analyzed and simulated. Based on the numerical simulations, the modulation parameters of the DTPM are optimized. Compared with single triangular phase modulation technology, the DTPM can not only achieve higher carrier suppression but also relax the requirements of modulation amplitude accuracy and temperature stability. The advantage of the DTPM for carrier suppression is validated by experiments, demonstrating that the DTPM is helpful in backscattering noise reduction. As a result, the experimental setup of the RIOG based on the DTPM is established: a bias stability of 0.22  deg/s (10 s integrated time) is achieved for 1 h. To our knowledge, this is the best long-term bias stability of an RIOG reported to date.
3 March 2016 in Optics Express
Verified
Journal Article
Open access
PDF file
JWJunjie Wang
Junjie Wang
LFLishuang Feng
Lishuang Feng
QWQiwei Wang
Qiwei Wang
XWXiao Wang
Xiao Wang
HJHongchen Jiao
Hongchen Jiao
In a resonator integrated optic gyro (RIOG) employing a planar optical waveguide ring, the interference between backreflected light and signal light will not only cause nonreciprocal drift of cw and ccw resonance frequencies, but also deteriorate the original signal waveform of the resonator output. If contra-phase triangular phase modulation (CPM) were applied, a cosine-like ripple, whose initial phase varies randomly, would superpose upon the quasi-square waveform of the resonator output, resulting in increment of noise and the gyro’s angle random walk (ARW). Therefore, in-phase triangular phase modulation (IPM) technique is proposed and used to eliminate the ripple and improve the waveform quality of the resonator output, and the gyro’s ARW is obviously reduced from 3 to 0.8 deg/h1/2 compared to that of CPM. This enlightens a new way to design the scheme of backreflection/backscattering suppression.
25 October 2018 in Journal of Lightwave Technology
Verified
Journal Article
Closed access
Hui LiHui Li
Hui Li
SLShuokai Li
Shuokai Li
KDKeke Deng
Keke Deng
SGShan Gao
Shan Gao
LFLishuang Feng
Lishuang Feng
A novel closed-loop control method with Pound-Drever-Hall (PDH) modulation technology is proposed to optimize the linearity and detection accuracy of micro-grating accelerometer in practical application. The closed-loop error is modulated to a high frequency for eliminating the direct current (DC) component of the interference intensity and stray light disturbance. After phase sensitive detector (PSD) and filter of demodulation, the closed-loop error signal is obtained with high signal to noise ratio (SNR). Based on the principle of designed modulation and demodulation method, the dynamic model of closed-loop micro-grating accelerometer is established considering the nonlinear interference effect, optical intensity fluctuation and unavoidable noise. Then, a robust control algorithm is designed to optimize the performance of micro-grating accelerometer. The experimental results demonstrate that the micro-grating accelerometer has linearity within 0.35% and the bias stability 0.2mg, which validate the effectiveness and usefulness of the proposed closed-loop detection scheme.
4 May 2021 in IEEE Sensors Journal
Verified
Journal Article
Closed access
SGShan Gao
Shan Gao
ZZZhen Zhou
Zhen Zhou
XBXiaowei Bi
Xiaowei Bi
LFLishuang Feng
Lishuang Feng
The micro-grating accelerometer based on the optical interference displacement measurement method has strict requirements on the parallelism of the interferometer and is susceptible to external interference. This paper proposes a micro-grating accelerometer with double-layer cantilever beams to suppress the effect of cross-axis acceleration and angular acceleration on the performance of the accelerometer. The mechanical characteristics of the designed double-layer cantilever beams structure and the conventional single-layer cantilever beams structure are compared by the finite element method. Theoretical results show that the symmetrical design of the double-layer cantilever beams structure can effectively reduce the cross-axis sensitivity. Under the same limit resolution, the torsional stiffness is increased by 50 times, which effectivity suppresses the disturbance of angular acceleration. The experimental results demonstrate that the designed structure has excellent linearity performance and low cross-axis sensitivity. The nonlinearity is reduced from 0.35% to 40.6 ppm, and the cross-axis sensitivity is better than 64.4 ppm.
24 November 2020 in Journal of Lightwave Technology
Verified
Journal Article
Closed access
Hui LiHui Li
Hui Li
PNPei Ren Ni
Pei Ren Ni
QWQiwei Wang
Qiwei Wang
CFChangkun Feng
Changkun Feng
LFLishuang Feng
Lishuang Feng
In this paper, a closed-loop signal detection method is proposed to improve the dynamic performance of the resonant integrated optical gyroscope. We firstly establish a closed-loop error model of the angular velocity tracking system with optical nonlinearity and parameter uncertainty based on triangular phase modulation technology. Then, we optimize the loop gains of the signal processing to improve the signal-to-noise ratio of the closed-loop error signal about angular velocity tracking. Secondly, we design a timing sequence control method to effectively eliminate the time-delay of signal processing for optimizing the dynamic performance of the angular velocity tracking system. Finally, a control algorithm is designed to suppress the influence of the optical nonlinearity and parameter uncertainty for improving the dynamic tracking performance of resonant integrated optical gyroscopes. The experimental results demonstrate that the resonant integrated optical gyroscope has a rise time less than 36us, a high frequency response with the bandwidth 13.1kHz and a low scale factor nonlinearity less than 269.2ppm, which verifies the effectiveness of the proposed closed-loop signal detection method for the resonant integrated optical gyroscope.