Sun Junqiang

Huazhong University of Science and Technology, Wu-han-shih, Hubei, China

Are you Sun Junqiang?

Claim your profile

Publications (11)4.57 Total impact

  • Source
    Hu Zhefeng · Sun Junqiang ·
    [Show abstract] [Hide abstract]
    ABSTRACT: We propose and experimentally demonstrate an all-optical Manchester NOT gate. A logic NOT signal is realized for a 10 Gb/s Manchester encoded signal, based on cross-gain modulation (XGM) in a reflective semiconductor optical amplifier (RSOA).
    Optica Applicata 01/2010; 40(1). · 0.46 Impact Factor
  • Source
    Yang Hongwu · Sun Junqiang · Du Qiujiao ·
    [Show abstract] [Hide abstract]
    ABSTRACT: Simultaneous all-optical frequency down-conversion technique based on cross-phase modulation in a high nonlinearity dispersion-shifted fiber is proposed and verified by simulation, and its application to a wavelength-division-multiplexing (WDM) radio over fiber (ROF) is proposed. Error-free simultaneous all-optical frequency down-conversion of the 16 WDM ROF upstream channels is achieved. The simulated results show the performance of WDM signals is in good accordance with a single signal without any interference, and the power difference of two beat frequencies of the down-conversion signal is independent of the optical local oscillator power. The wavelength span of larger than 20 nm for down-conversion signal can be obtained.
    Optica Applicata 01/2009; 39(1). · 0.46 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: All-optical flexible 20-Gb/s logic and gate based on cascaded sum- and difference-frequency generation in a periodically poled lithium niobate waveguide is proposed and experimentally demonstrated. The theoretical analyses further indicate that 40-, 80-, and 160-Gb/s ultrahigh-speed logic and operations can potentially be performed. Moreover, it is expected that the and output can be tuned in a wide wavelength range (67 nm) with slight fluctuation of the Q-factor and extinction ratio.
    IEEE Photonics Technology Letters 03/2008; 20(3-20):211 - 213. DOI:10.1109/LPT.2007.913227 · 2.11 Impact Factor
  • Zhang Xinliang · Xu Fan · Sun Junqiang · Liu Deming · Huang Dexiu ·
    [Show abstract] [Hide abstract]
    ABSTRACT: Tunable all-optical wavelength converters have been regarded as key opto-electronic devices in intelligent next-generation optical networks. A novel scheme for tunable wavelength conversion, based on cross-gain modulation (XGM) in a semiconductor optical amplifier (SOA)-based fiber-ring laser, is proposed. Then, theoretical model for this novel scheme is established. Conversion output characteristics are calculated theoretically and measured experimentally under different conditions. The experimental results coincide with the theoretical results. Tunable wavelength conversion at 2.5 and 10 Gb/s with a 40-nm tuning range are demonstrated experimentally. Experimental and theoretical studies show that this novel scheme is worthy of further investigation. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 41: 237–241, 2004; Published online in Wiley InterScience ( DOI 10.1002/mop.20104
    Microwave and Optical Technology Letters 05/2004; 41(3):237 - 241. DOI:10.1002/mop.20104 · 0.57 Impact Factor
  • Source
    Huang Lirong · Huang Dexiu · Sun Junqiang · Liu Deming ·
    [Show abstract] [Hide abstract]
    ABSTRACT: Birefringence in semiconductor optical amplifier (SOA) has begun to receive increasing attentions in recent years, in this paper we investigate the effect of birefringence on spectral broadening of ultrashort optical pulse, based on Jones Matrix method, Fourier transform method and a multi-section model, which takes into account the polarization dependency of phase modulation. The time-dependent carrier distribution, pulse amplification process and pulse spectrum evolution along SOA is simulated. It is found that a considerable part of spectral broadening comes from birefringence, this kind of additional spectral broadening depends on bias current, optical power and pulse shape of input pulse.
    Proceedings of SPIE - The International Society for Optical Engineering 08/2003; 223(4):295-300. DOI:10.1016/S0030-4018(03)01685-7 · 0.20 Impact Factor
  • Source
    Hong Wei · Huang Dexiu · Sun Junqiang · Liu Deming ·
    [Show abstract] [Hide abstract]
    ABSTRACT: This paper aims at numerically simulating gain recovery enhancement effect in semiconductor optical amplifiers (SOAs) when a CW pump light is applied. The effective carrier lifetime reduction behaviors are simulated for different CW wavelengths. Gain saturation behaviors at the signal wavelength as well as gain and phase-shift dynamics introduced by short pulse amplification in presence of the CW pump light are also simulated for different CW wavelengths and powers. The results confirms the feasibility of enhancing the recovery rate of SOA by a CW pump light near the material transparency wavelength.
    Proceedings of SPIE - The International Society for Optical Engineering 12/2002; 214(1-6-214):335-341. DOI:10.1016/S0030-4018(02)02185-5 · 0.20 Impact Factor
  • Lu Ping · Liu Denting · Huang Dexiu · Sun Junqiang ·
    [Show abstract] [Hide abstract]
    ABSTRACT: The fiber-optic Mach-Zehnder (M-Z) interferometer can be used as wavelength-multiplexers and demultiplexers. The ΔL and ΔΦ directly influence the properties of M-Z. Through lengthening the ΔL, M-Z can demultiplex many more wavelengths. But the longer ΔL is, the more seriously the temperature will influence M-Z. We explored a method to solve this problem, making M-Z work stably. The wavelength spacing is 0.8 nm, and the extinction ratio is high.
  • Sun Junqiang · Zhang Xinliang · Liu Deming · Huang Dexiu ·
    [Show abstract] [Hide abstract]
    ABSTRACT: With the consideration of cross-gain modulation (XGM) and probe-depletion (PD) effects, an analytical solution of four-wave mixing (FWM) between picosecond optical pulses in semiconductor optical amplifiers is developed based on our “splitting model.” The results indicate that the effect of PD plays an important role in the FWM process for lower pump pulse energy and smaller pump–probe frequency detuning, while the effect of XGM dominates for the pump pulse with higher energy, a shorter pulsewidth, and a larger pump–probe frequency detuning. © 2001 John Wiley & Sons, Inc. Microwave Opt Technol Lett 28: 78–82, 2001.
    Microwave and Optical Technology Letters 01/2001; 28(1):78-82. DOI:10.1002/1098-2760(20010105)28:13.0.CO;2-Z · 0.57 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: A novel scheme for XGM wavelength conversion based on single-port-coupled SOA has been achieved with improved extinction ratio performance. In wavelength upconversion between 1549.8 nm and 1562.6 nm at 2.5 Gbit/s, the output extinction ratio can be higher than 15 dB. Theoretical calculation shows that its extinction ratio and input dynamic range are better than that in conventional schemes based on identical long and double long, double-port-coupled SOA
    Communication Technology Proceedings, 2000. WCC - ICCT 2000. International Conference on; 02/2000
  • Zhang Xinliang · Huang Dexiu · Sun Junqiang · Liu Deming ·
    [Show abstract] [Hide abstract]
    ABSTRACT: A novel XGM wavelength conversion scheme exploiting semiconductor laser amplifier in a loop mirror (SLAOLM) has been demonstrated. Results showed that this scheme is helpful for extinction ratio and noise performance improvement simultaneously, due to the coexistence of gain saturation and phase modulation effect
    Infrared and Millimeter Waves, 2000. Conference Digest. 2000 25th International Conference on; 02/2000
  • Zhang Xinliang · Sun Junqiang · Liu Deming · Huang Dexiu ·
    [Show abstract] [Hide abstract]
    ABSTRACT: Summary form only given. The XGM wavelength conversions reported before are all based on gain saturation effect in which the phase of the converted signal is inverted to the input signal, that will increase the complexity in signal processing and the system cost. Furthermore, due to the inverting operation of the converter, the converted pulses are blue shifted on the leading edge while red shifted on the trailing edge. This leads to a pronounced pulse broadening when transmitted over standard nondispersion shifted fiber. In-phase wavelength conversion based on cross-gain modulation (XGM) in SOA, to our knowledge, is the first time to be demonstrated by adjusting structure parameters and selecting appropriate bias current of the SOA
    Filtration Industry Analyst 01/2000; DOI:10.1109/CLEO.2000.906848