Yuanwu Wang

Fiber Fault Detection With High Accuracy Using Chaotic Signal From an SOA Ring Reflectometry

A simple optical reflectometry with a semiconductor optical amplifier ring structure is proposed for the first time to locate the accurate fiber fault position using the chaotic correlation detection method. The experimental results show that a much higher spatial resolution of about 50 μm and a measured stability of ±150 μm are achieved.

All-optical logic operation of polarized light signals in highly nonlinear silicon hybrid plasmonic microring resonators.

All-optical logic operation is theoretically demonstrated by means of polarization-dependent four-wave mixing (FWM) processes in a highly nonlinear silicon hybrid plasmonic waveguide (HPWG) microring resonator. We design an ultra-compact (radii = 1 μm) microring resonator (MRR) that is realized by using a silicon HPWG with the capacity for subwavelength-bending. The HPWG exhibits very high confinement (Aeff~0.045 μm(2)) that can result in a remarkably high nonlinear parameter (γ~3000 W(-1) m(-1)), given a highly nonlinear gap material. By manipulating the polarization properties of the pump and signals with a very low electric field (|E|~10(8) Vm(-1)), all-optical NOT, NOR, and NAND logical operations are obtained through the FWM process. These compact all-optical nanoplasmonic devices are stable, fabrication simplified, and silicon on insulator (SOI) compatible.

Graph software developing tools for designing forming machines and dies

Abstract It is desirable that a drawing marked with dimension parameters can be converted into a dimension parameter graph program (DPGP) and that this process can be done automatically by computer. For this purpose, in the paper a dimension parameter drawing (DPD) is translated into dimension lists and a geometry list, then the lists are converted into a DPGP with graph software developing tools.

Wavelength-swept single longitudinal mode fiber ring laser locked to 25 GHz ITU grid

Wavelength-swept single longitudinal mode fiber laser incorporating Fabry-Perot filter and bandpass filter is demonstrated. The proposed laser has a tuning range over 30 nm with tuning step 0.2 nm.

Multiwavelength generation based on a mode-locked fiber laser using carbon nanotube and fiber Fabry–Perot filter

In this paper, a novel and compact configuration of stable multiwavelength generation with a uniform wavelength interval is proposed for the first time to our knowledge. It employs a mode-locked fiber laser using a carbon nanotube and spectrum-slicing technique. A flat rectangular optical output spectrum is demonstrated by adjusting the dispersion value of the fiber-loop cavity and the pump power. With a fiber Fabry-Perot filter, 33 wavelengths with 0.2 nm spacing are obtained among the power uniformity of 2.3 dB. Moreover, the variations of output power at each wavelength are all less than 0.1 dB, which implies excellent stability of the whole structure.

Efficient and broadband wavelength conversion in a slot waveguide with the periodic structure altering the phase-mismatch

High-efficiency wavelength conversion based on the quasi-phase-matching technique is proposed and simulated in a slot waveguide. Benefit from the tight light confinement and the high nonlinear material (silicon nanocrystal) filled in the slot region, a large nonlinear coefficient is achieved. With the linear phase-mismatch alternately changing between two values of the opposite signs, periodical attenuation of the idler power is suppressed even in the presence of severe dispersion. Numerical simulation shows that an efficiency of -12.3 dB at 1850 nm and a 3-dB bandwidth of 484 nm are available for the 1550 nm-wavelength pump in a 4 mm long silicon slot waveguide.

High-efficiency and broadband wavelength conversion in a slot waveguide with the periodic structure altering the phase-mismatch

High-efficiency wavelength conversion based on the quasi-phase-matching technique is proposed and simulated in a slot waveguide. Benefit from the tight light confinement and the high nonlinear material (silicon nanocrystal) filled in the slot region, a large nonlinear coefficient is achieved. With the linear phase-mismatch alternately changing between two values of the opposite signs, periodical attenuation of the idler power is suppressed even in the presence of severe dispersion. Numerical simulation shows that an efficiency of −12.3 dB at 1850 nm and a 3-dB bandwidth of 484 nm are available for the 1550 nm-wavelength pump in a 4 mm long silicon slot waveguide.

Multi-wavelength generation based on a mode-locked fiber laser using carbon nanotube and fiber Fabry-Perot filter

A novel configuration which employs a carbon nanotube (CNT) and spectrum-slicing technique for 33 wavelengths generation with 0.2 nm spacing among the power uniformity of 2.3 dB is proposed and demonstrated for the first time.