Showing papers by "Jinhui Yuan published in 2011"

Highly Efficient and Broadband Cherenkov Radiation at the Visible Wavelength in the Fundamental Mode of Photonic Crystal Fiber

Abstract: Highly efficient and broadband Cherenkov radiations (CRs) by soliton self-frequency shift (SSFS) are generated in the fundamental mode of photonic crystal fiber (PCF) fabricated in our laboratory. The dependences of CR on the pump wavelength and power are investigated, and the corresponding nonlinear-optical processes are discussed. When the average power of the 120-fs pump pulse increases from 100 to 300 mW, the Raman soliton shifts from 1970 to 2130 nm, the conversion efficiency of CR in the range of 580 to 545 nm increases from 8% to 31%, and the width of output optical spectrum at the visible wavelength broadens from 11 to 54 nm.

Highly Efficient Anti-Stokes Signal Conversion by Pumping in the Normal and Anomalous Dispersion Regions in the Fundamental Mode of Photonic Crystal Fiber

Abstract: By pumping near the zero dispersion wavelength, the highly efficient anti-Stokes signal conversions of the femtosecond pulses in the fundamental mode of photonic crystal fiber (PCF) with the zero dispersion wavelength of 848 nm have been achieved within the wavelength range of 644 to 543 nm. When the pump works at 820 nm, 830 nm and 840 nm with the average power of 500 mW, the power ratios of the anti-Stokes signals at 594 nm, 581 nm, and 543 nm and the residual pump components are 9.8:1, 17.6:1, and 22.6:1, and the corresponding conversion efficiency η can be up to 33%, 39%, and 46%. When the pump works at 860 nm with the same power, the power ratio of anti-Stokes signals at 553 nm and the residual pump components is 19.4:1 with η of 43%. In the experiment, because of low output powers of the trivial and residual pump components and high depletion of Stokes components, the output anti-Stokes signal spectra appear much clearer, and the optical beams of signals are with good qualities. The influences of pump power and wavelength interval between the working wavelength and zero dispersion wavelength of PCF on the signal conversion are also demonstrated.

Investigation on bismuth-oxide photonic crystal fiber for optical parametric amplification

Abstract: A hexagonal solid-core bismuth-oxide micro-structure fiber is developed to balance its dispersion and nonlinearity. This simulation and calculation results show that the bismuth-oxide photonic crystal fiber (Bi-PCF) has near zero dispersion around 1550 nm. Its dispersion slop in the communication wavelength range is also relatively flat. Moreover, both nonlinear coefficient and model field distribution are obtained. Compared with the experimental results by SiO2-PCF, it can be seen that the Bi-PCF shows excellent characteristics for the optical parametric amplification (OPA).

Influence of Raman effect on the noise characteristics in a dual pump FOPA

Abstract: Influence induced by Raman effect on the noise characteristics of a depleted and lossy dual pump fiber optical parametric amplifier (FOPA) is investigated. Taking the Raman effect into account, the modified coupled amplitude equations are firstly built, then the influences of Raman effect on the Stokes and anti-Stokes wavelengths with different initial signal powers are further analyzed. Besides, the effect on the FOPA gain is also shown with the same initial signal power and constant noise figure (NF).

Performance analysis of the silicon waveguide-based wavelength converter

Abstract: The conversion efficiency and noise figure (NF) of the silicon-on-insulator (SOI) waveguide-based wavelength converter are investigated with the coupled equations. The effects of the pump power, the nonlinear absorption and the waveguide length on the conversion efficiency and noise figure are discussed. The conversion efficiency decreases with the increasing pump power and the noise figure is degraded due to the two-photon absorption (TPA) and the TPA-induced free-carrier absorption (FCA) at the higher pump power. With the increasing of the free carrier lifetime, the conversion efficiency will decrease and the noise figure will increase accordingly. The optimal waveguide length depends on the pump power and the free carrier lifetime. In practical applications, the high conversion efficiency and low noise figure can be achieved by choosing suitable parameters of the silicon waveguide.

Highly efficient and widely wavelength-tunable anti-Stokes signal conversion in the fundamental mode of photonic crystal fiber

Abstract: Anti-Stokes signals from 645 to 543nm are generated in the fundamental mode. The power ratio of signal at 543 nm to residual pump at 840 nm is 22.6∶1, the conversion efficiency P as /P p0 being above 45%.

Efficient and wavelength-tunable anti-Stokes frequency conversion with good beam quality in the fundamental mode of photonic crystal fiber

Abstract: Using the photonic crystal fiber (PCF) with the zero dispersion wavelength of 848 nm for the fundamental mode, the efficient anti-Stokes signal generations from 645 to 543 nm are realized by pumping in the normal dispersion region. When the pump average power increases from 200 to 500 mW, the output power of the anti-Stokes signal increases 8.46 times, the power ratio of the anti-Stokes signal at 543 nm to the residual pump is calculated as 22.6:1, and the conversion efficiency η in the experiment can be up to 46%. Moreover, good optical beam quality of the anti-Stokes signal can be achieved.