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Ultrasound imaging is one of the important noninvasive techniques used in medical diagnosis. Unfortunately, the far field beam pattern in ultrasound is a sinc function, which has a better main lobe (the resolution of ultrasound imaging) and high side-lobe about −13dB down from the maximum on axis value (the contrast of ultrasound imaging). The result for that is one of a famous artifact in medical...
We develop a novel apodized, 16-level-phase-shifted SSFBG optical encoder/decoder, which can improve the system performance of OCDMA system. Error free (BERLt10-12) transmissions of 8-user, 10 Gbps, DPSK-OCDMA over 50 km are successfully demonstrated.
For one-dimensional (1-D) photonic crystals, the amplitude reversal in refractive index profile is defined as an equivalent pi phase shift. With these defined pi phase shifts, the binary phase-only sampling approach can be implemented to design 1-D photonic crystal-based multichannel filters. Such filters exhibit high-count channels and excellent channel uniformity, which is identical with the phenomena...
Apodization technique is applied to suppress sidelobes in the reflection spectrum of periodically placed resonators side-coupled to photonic crystal waveguide. Good agreement is obtained between theoretical analysis by transfer-matrix method derived from coupled mode theory in time and simulation experiments. Furthermore, phase response of the reflection filter is investigated to analyze the transmission...
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