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The finite-difference time-domain (FDTD) method is employed to analyze the tolerance of the radius of the defected cylinder within periodical dielectric waveguide (PDWG). The optical transmission is very sensitive to the radius of the defected cylinder. It shows that the tolerance of the radius of defected cylinder within PDWG is not good.
A novel all-optical sampling based on nonlinear polarization rotation in a semiconductor optical amplifier is presented. An analog optical signal and an optical pulses train are injected into semiconductor optical amplifier simultaneously, and the analog light modulates the output optical pulse through controlling the rotated angle of nonlinear polarization rotation of the optical pulse. Therefore,...
A wavelength selective optical isolator is proposed. Being different from conventional isolators, a well-designed wave plate is employed and works together with the Faraday rotator. Different wavelengths thus experiences different phase retardation so that wavelength-dependant polarization states are obtained for bidirectional beams. A (1.49 μm, 1.31 μm) wavelength selective isolator is demonstrated,...
Based on the preliminary investigation and focused on the corona poling technology for modified PMMA films, some practical and operable way are proposed to enhance the poling efficiency and the second-order nonlinear optical effect of the films. For universal uneven distributions of the polarization field in traditional single-pin corona poled systems, a novel multi-pin corona poling structure is...
The LCD is proposed as a new phase shifter with the advantage that the phase shifting is controlled digitally with no any mechanical moving and rotating elements. Phase shifting can be readily introduced by changing the coded image displayed on the LCD. Hence the LCD's phase modulation characteristics are analyzed theoretically and experimentally. A short overview of different calibration methods...
An intensity-modulation direct-detection (IMDD) radio-over-fiber link with a tunable transfer function is presented. It utilizes a bias drift free intensity modulator based on a Sagnac fiber loop interferometer containing an optical phase modulator. By adjusting the polarization controller in the interferometer, the transfer function of the whole system can be tuned. The present method is simple and...
An electrically controlled superresolution filter is proposed for the manipulation of transverse superresolution performance and axial focal shift. It consists of two parallel polarizers and a four-zone electro-optic crystal. The spatial manipulation of the polarization state and intensity can be realized by voltage applied on this four-zone electro-optic crystal. The redistribution of the filtered...
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