The properties of truly confined modes of a 2D hex horizontal photonic crystal slot slab waveguide are analyzed. Then
the dispersion of liner defect waveguide is calculated. In addition, what influence the slots with different height have
over the band structure and the group velocity dispersion of the defect mode waveguide are analyzed. Based on these
studies, an ultra-compact silicon-based Mach-Zehnder amplitude modulator is proposed. For a design with almost
negligible first order chromatic dispersion in an optical bandwidth of 1THz, we predict a modulation bandwidth of
40GHz and a length of about 80µm. This is achieved by infiltrating an electro-optic polymer into a slotted photonic
crystal waveguide, the strong field confinement in slotted waveguides and the slow light interaction enhancements
provided by the photonic crystal waveguide, where group velocity and dispersion may be controlled.
A slot waveguide structure is used in the part of arrayed waveguides in AWG instead of silicon waveguides. It is filled
with high negative thermo-optic coefficient polymer in the narrow slot. The arrayed slot structure can remarkably reduce
the center wavelength shift when the temperature changes. In this study, we use the polymer WIR30-490 and ZP49 to be
filled in the slot. The thermo-optic coefficients of WIR30-490 and ZP49 are negative, and have the same order of
magnitude with silicon. In our simulations, by adjusting several variables of the slot structure, such as the width of the
slot between the pair of silicon wires, the width of the silicon waveguide, and the height of the silicon waveguide, we can
get the athermal condition of AWG for each polymer. Even if there is an acceptable error on fabrication, temperature-dependent
center wavelength shift of AWG can still be reduced down to 1 pm/°C. It makes the fabrication of athermal
silicon AWG possible.
One kind of electro-optic polymer assisted Mach-Zehnder optical switch based on silicon slot structure is presented. By
filling electro-optic material in the void slot of the arms, direct electro-optic modulation can be introduced. Theoretical
model and detailed analysis is given in this paper.
This paper presents a novel micro-ring-resonator-assisted structure as an optical switch. This device couples two outputs
of a 1x2 power splitter into a micro-ring resonator (MRR). The double-beam interference will occur in the MRR. If the
phase difference between the beams and the coupling coefficients of MRR are set properly, the device can switch the
light by applying phase shift on MRR. High extinction ratio or low crosstalk can be achieved, even if the modulation
additional loss is large.
In this paper, a novel ARM-based mechatronics control technique applied in terry rapier loom was presented. Electronic
weft selection, electronic fluff, electronic let-off and take-up motions system, which consists of position and speedcontrolled
servomechanisms, were studied. The control system configuration, operation principle, and mathematical
models of electronic drives system were analyzed. The synchronism among all mechanical motions and an improved
intelligent control algorithm for the warp let-off tension control was discussed. The result indict that, by applying
electronic and embedded control techniques and the individual servomechanisms, the electronic weft selection,
electronic let-off device and electronic take-up device in HGA732T terry rapier loom have greatly simplified the initial
complicated mechanism, kept the warp tension constant from full to empty beam, set the variable weft density,
eliminated the start mark effectively, promoted its flexibility, reliability and properties, and improved the fabric quality.