Showing papers by "Jinhui Yuan published in 2010"

The modulation function and realizing method of holographic functional screen

Abstract: The modulation function of holographic functional screen (HFS) in the real-time, large-size full-color (RLF), three-dimensional (3D) display system is derived from angular spectrum analysis. The directional laser speckle (DLS) method to realize the HFS is proposed. A HFS by the DLS method was fabricated and used in the experiment. Experimental results show that the HFS is valid in the RLF 3D display, and that the derived modulation function is valuable for the design of the HFS. The research results are important to realize the RLF 3D display system which will find many applications such as holographic video.

Highly Efficient Wavelength-Tunable Anti-Stokes Signal Conversion of Femtosecond Pulses in the Fundamental Mode of Photonic Crystal Fiber

Abstract: With the photonic crystal fiber (PCF) with the zero dispersion wavelength of fundamental mode around 830 nm designed and fabricated in our lab, the anti-Stokes signals from 603 to 535 nm are efficiently generated in the fundamental mode by Ti:sapphire laser with central wavelength of 820 nm and pulse width of 150 fs. When the pump power increases from 80 to 320 mW in a separation of 40 mW, the output powers of anti-Stokes signals increase 6 times, and the maximum power ratio of anti-Stokes signal at 535 nm to the residual pump component is estimated as 12:1. The maximum output power ratio of the anti-Stokes signal at 535 nm and the Stokes component at 865 nm is about 2:1. The maximum conversion efficiency of P a/P p0 in experiment can achieve up to 42%, and the possible reasons for discrepancy between experimental and theoretical results are analyzed. Moreover, the influences of other factors on experiment process are elementarily discussed.

Simulation investigation on supercontinuum generation and noise characteristics in the normal dispersion photonic crystal fiber with a flattened dispersion profile

Abstract: The propagation of picosecond pulses in the normal dispersion photonic crystal fiber (PCF) with a flattened dispersion profile is numerically investigated. The characteristics of the amplitude and phase noise in the supercontinuum generation (SCG) are also analyzed through the coherent sliced supercontinuum (SC). The effects of self-phase modulation (SPM) and four-wave mixing (FWM) on broadening of the pulse spectrum are presented, and the best amplitude and phase noise performance with a specific fiber length is obtained. The SCG in the wavelength range of 1475 to 1625 nm has only fluctuation between ±1.5 dB, and both the amplitude and phase noise caused by the intensity noise of the input power is below 2.5% in the range of 1500 to 1600 nm.

Investigation on noise characteristics of dual-pumped fiber optical parametric amplifiers based on photonic crystal fibers

Abstract: The noise characteristics of dual-pumped fiber optical parametric amplifiers (FOPAs) induced by gain and loss in photonic crystal fibers (PCFs) are analyzed. A special photonic crystal fiber is designed. Its noise figure (NF) changes with structure parameters, and it decreases as the hole diameter decreases. Three factors including input-signal power, signal wavelength and pump separation which impact on the final noise figure are discussed with the designed PCF.

Influence of the zero dispersion wavelength fluctuation on the gain and noise performance in dual-pump fiber parametric amplifiers

Abstract: Because of the zero dispersion wavelength (ZDWL) random fluctuations, the gain and noise figures deteriorate in optical parametric amplifiers based on highly nonlinear fibers (HNLFs). The detrimental role of ZDWL fluctuations on the gain and noise performance in dual-pump fiber optical parametric amplifiers (FOPAs) is presented. Numerical investigations of noise figure (NF) for different fibers with random fluctuation are analyzed. The noise figures for different fibers are varying even if the random fluctuation is small. Through choosing HNLFs with low ZDWL fluctuation and large nonlinear coefficient, high-gain and low-noise performance can be obtained.

A novel structure photonic crystal fiber based on bismuth-oxide for optical parametric amplification

Abstract: The heavy metal oxide glasses containing bismuth such as bismuth sesquioxide show unique high refractive index. In addition, the bismuth-oxide based glass does not include toxic elements such as Pb, As, Se, Te, and exhibits well chemical, mechanical and thermal stability. Hence, it is used to fabricate high nonlinear fiber for nonlinear optical application. Although the bismuth-oxide based high nonlinear fiber can be fusion-spliced to conventional silica fibers and have above advantages, yet it suffers from large group velocity dispersion because of material chromatic dispersion which restricts its utility. In regard to this, the micro-structure was introduced to adjust the dispersion of bismuth-oxide high nonlinear fiber in the 1550nm wave-band. In this paper, a hexagonal solid-core micro-structure is developed to balance its dispersion and nonlinearity. Our simulation and calculation results show that the bismuth-oxide based photonic crystal fiber has near zero dispersion around 1550nm where the optical parametric amplification suitable wavelength is. Its dispersion slop in the communication wavelength range is also relatively flat. Moreover, both nonlinear coefficient and model filed distribution were simulated, respectively.

60 GHz OCS mm-wave generation for ROF system based on saturated parametric amplification effect in HNLF

Abstract: A novel approach to generate 60 GHz optical carrier suppression (OCS) millimeter-wave (mm-wave) signal based on the saturated optical parametric amplification (OPA) effect in high non-linear fiber (HNLF) is investigated. In the proposed system, the OPA effect occurs when the signal and pump with 30 GHz frequency interval are set into the high non-linear fiber. By controlling the length of HNLF, OPA effect saturates, and the pump power is delivered in a large extent to the signal and idler light, so a 60 GHz OCS mm-wave is generated. The system does not need high-speed external modulator, high-frequency vibration source or narrow-band filter, which greatly reduces the cost and improves the stability of the radio over fiber (ROF) system. Results show that the 10 Gb/s downstream signal can be transmitted with negligible power penalty.