Changjian Ke

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We propose and experimentally demonstrate an effective spectral linewidth suppression scheme for a commercial tunable laser source. By using a long-cavity, narrow-bandwidth stimulated Brillouin scattering filter and multifrequency-selection mechanism simultaneously, a single-longitudinal-mode laser output with linewidth suppression from ~3 MHz to less than(More)
We present a new approach to the design of the holey fibers that have ultra-high nonlinearity and dispersion properties optimized for tunable fiber parametric wavelength converters based on degenerated four wave mixing. This hybrid approach combines downhill simplex algorithms with four wave mixing modeling. Exploiting the relations between fiber properties(More)
A polarization-independent narrow passband optical filter with a FWHM bandwidth of ~10 MHz based on stimulated Brillouin scattering (SBS) effect is proposed and experimentally demonstrated. By optimizing the parameters of a depolarizer consisting of a power-splitting Mach-Zehnder interferometer (MZI) structure, degree of polarization (DOP) of the pump(More)
A high-input dynamic range and selectivity stimulated Brillouin scattering (SBS)-based microwave photonic filter (MPF) is proposed and experimentally demonstrated. By utilizing a pump-splitting dual-stage scheme to mitigate the gain saturation, an input dynamic range of >40  dB and a selectivity of >49  dB are achieved simultaneously for the first time, to(More)
A novel electro-optic chaos source is proposed on the basis of the reverse-time chaos theory and an analog-digital hybrid feedback loop. The analog output of the system can be determined by the numeric states of shift registers, which makes the system robust and easy to control. The dynamical properties as well as the complexity dependence on the feedback(More)
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