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孙军强, Junqiang Sun, Wei Liu, Jing Tian, Member, IEEE, J. R. Kurz, and M. M. Fejer
IEEE PHOTONICS TECHNOLOGY LETTERS, VOL. 15, NO.12, DECEMBER 2003,-0001,():
-1年11月30日
Ten-channel wavelength conversion is achieved by exploiting cascaded second-order nonlinearity in periodically poled LiNbO3 waveguides. No external pump input is required in the converter and conversion efficiency is improved due to the enhancement of pump and signal interaction. Approximate 70-nm conversion bandwidth is realized under pump power less than 25mW at 1550-nm band.
Nonlinear optics,, optical fiber communication,, wavelength conversion,, wavelength-division multiplexing.,
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孙军强, JUN QIA NG SUN*, DEMI NG LIU AND DEXIU HUNG
Optical and Quantum Electronics 36: 577-587, 2004.,-0001,():
-1年11月30日
A theoretical model of ultrashort pulse difference-frequency generation (DFG) is presented and developed with quasi-phase matching (QPM) gratings in the undepleted-pump, unamplified-signal approximation. An analytic solution to a case of ultrashort pulse pumped DFG process, including groupvelocity mismatching effects and input pulses with frequency chirp and time delay, is obtained. The influences of group-velocity mismatching effects and input signal pulse parameters on the conversion efficiency and output converted pulse characteristics are analyzed and discussed. The results indicate that the conversion efficiency is increased due to the enhancement of pump and signal interaction. The output pulse is inevitable compressed under pulsed pumping and can be compensated by introducing the initial frequency chirp and time delay.
all-optical signal process,, difference-frequency generation,, nonlinear optics,, optical waveguide
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孙军强, Wei Liua, *, Junqiang Sun a, Jonathan Kurz b
Optics Communications 216(2003)239-246,-0001,():
-1年11月30日
Bandwidth and tunability enhancement of difference frequency generation (DFG)-based wavelength conversion by introducing various distributing formats of p-phase shifting domains into the quasi-phase-matching (QPM) gratings is demonstrated, and the concise expressions describing the tuning curves in these cases are obtained for the first time. The results show not only the pump and signal bandwidth can be obviously broadened and flattened, but also diverse comblike pump-wavelength tuning curves with controllable channel spacing can be achieved by introducing periodically distributed p-phase shifting domains into the QPM gratings, which would greatly improve the tunability and practibility of DFG-based wavelength converters.
Optical wavelength conversion, Difference-frequency generation, Quasi-phase-matching
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孙军强, Junqiang Sun*, Wei Liu
Optics Communications 224(2003)125-130,-0001,():
-1年11月30日
Multiwavelength oscillation is demonstrated with a novel laser scheme, in which cascaded second-order nonlinearity in a periodically poled LiNbO3 (PPLN) waveguide is used to double the lasing lines. Twenty-two wavelengths approaching S- and L-bands are simultaneously achieved with a channel spacing of 1.6 nm, and the band separation is changeable. The number of wavelengths and channel spacing can be controlled by the adjustment of the tunable Fabry-Perot (FP) etalon and light polarization states in the laser cavity.
Second-order nonlinearity, Multiwavelength lasing, Erbium-doped fiber, Wavelength-division multiplexing
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【期刊论文】Influence of crosstalk on the scalability of WDM cross-connect networks
孙军强, J. Sun
IEE Proc.-Optoelectron., Vol. 149, No.2, April 2002,-0001,():
-1年11月30日
Intraband crosstalk contributions in three types of WDM cross-connect topologies based on the Benes architectures are identified. The crosstalk behaviours of the WDM networks are compared and discussed. It is demonstrated that the first-order crosstalk contributions are dominated by the crosstalk from the switching elements. The network scalability is analysed in terms of fibres, wavelengths and nodes. The results show that routing different wavelengths in each switching architecture in WDM cross-connect networks is a reasonable approach to achieve perfect performance in the presence of component crosstalk.
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