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Optical tuning of guided mode resonance (GMR) is demonstrated in an azo-copolymer waveguide grating structure (WGS), comprised of a one-dimensional holographic surface relief grating inscribed on top of an azo-copolymer planar waveguide layer. The resonance wavelength of GMR is blue-shifted by pumping the WGS with a linear polarized laser beam at 514 nm as a result of the photoinduced refractive index...
We propose reconfigurable optical add/drop multiplexing in a data link using orbital angular momentum (OAM) mode division multiplexing. Adding/dropping of one OAM mode from three multiplexed OAM modes, each carrying 100 Gbit/s QPSK data is demonstrated, with an OSNR penalty of <; 2dB.
A 3-D chirped high-contrast grating hollow-core waveguide (HCG-HW) exhibits highly efficient 2-D (transverse and lateral) light confinement. Compared with step-index ones, laterally chirped HCG-HWs (graded index) can pronouncedly reduce the propagation loss without compromising the lateral index contrast. Simulation results show that a propagation loss as low as 0.04 dB/cm can be achieved...
A tapped delay-line matched filter is designed using high-contrast grating hollow-core waveguides. Simulation results indicate a SNR gain of 18.24dB, which is ∼83% of an idea matched filter, and a fabrication tolerance of ∼ 75-nm.
Chirped high-contrast-grating hollow-core waveguide demonstrates a >10× loss reduction. Simulation shows that a propagation loss as low as 0.04 dB/cm can be achieved with a nonlinear coefficient on the order of 10−5 /W/m.
A low insertion loss optical coupler is designed using chirped high-contrast-grating hollow-core waveguide. 100% tuning of power coupling ratio is realized through mechanically adjusting the waveguide height by ∼3 um.
Performance evaluation of a mobile WiMAX beam forming network(BFN) and design algorithm of using the RF digital Step attenuator (DSA) for implemeting the BFN are described. The architecture of the BFN controller and the steering operation modes of the BFN are also introduced. Optimization of the antenna element spacing in considering of the mutual coupling against the grating lobe suppression is analyzed...
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