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We present a method to enhance the optical Kerr nonlinearity by introducing a gain-loss balanced feedback control structure. Our gain-loss balanced system consists of two indirectly coupled whispering-gallery-mode resonators in which one is a loss resonator and the other is a gain resonator. We found that the Kerr nonlinearity in the loss resonator can be greatly enhanced in the vicinity of the so-called...
Silicon slot waveguide based mode converter was designed for the effective mode conversion and polarization rotation between a horizontal channel waveguide and a vertical slot waveguide. The device with minimum length of 40µm was demonstrated in amorphous silicon waveguides to provide the mode conversion between the TE mode in the horizontal channel waveguide and the TM mode in the horizontal slot-waveguide...
An optimized grating coupler featuring both ultra-broad bandwidth and high-efficiency has been achieved for the first time for the +1 diffraction order at a central operating wavelength 1.55 µm for TM polarization in horizontal slot waveguides. With proper design of the thickness of the groove thickness in grating region, we achieved a 60 nm 1 dB bandwidth, and the 3 dB bandwidth is 92 nm covering...
We experimentally demonstrated a highly compact 1-to-2 multimode interference splitter to achieve polarization insensitive ultra-low loss behavior. The excess loss is 0.112 dB and 0.184 dB for TE and TM mode, respectively.
Omnidirectional absorption enhancements induced by localized surface plasmon resonances supported by gold nanowire arrays embedded in a slab waveguide are demonstrated, which could find applications on novel photovoltaic devices or photodetectors.
We report the observation of an ultra-narrow band plasmon induced transparency resonance which is realized in a large area hybrid plasmon-waveguide system consisting of a gold nanowire array embedded in a slab waveguide.
A polarization diversity circuit in silicon waveguide was developed. The polarization dependent loss is 0.5 dB. The insertion loss from the polarization diversity components is 3 dB. The extinction ratio of the ring circuit is 20 dB.
A 3μm long ultra small surface plasmon polariton effect based TM to TE polarization rotator was designed. Effective polarization rotation was achieved in fabricated devices. 10dB PER and 11dB insertion loss were achieved in experiments.
In this paper, fabrication tolerance of two mode-coupling-based polarization rotators, slanted-angle polarization rotator and asymmetric sidewall polarization rotator, is studied and compared based on BPM and three-dimensional FDTD simulations. Optimization on both structures has achieved over 20 dB polarization extinction ratio with short rotation length. The effects of variation on rotation length,...
Traditional metallic interconnects has become the bottleneck of NoC (Network on Chip) performance due to the limited bandwidth, long delay, high power consumption and crosstalk noise. Optical Network-on-Chip (ONoC) can decrease interconnect delays and provide higher bandwidth, lower power consumption. So ONoC is believed to be a promising solution. ONoC is based on silicon-based waveguides and CMOS-compatible...
A silicon waveguide based TE mode converter was designed for the mode conversion between a horizontal waveguide and vertical waveguide in the two-layer structure waveguide based polarization diversity circuit. The TE mode converter's performance was studied. The polarization mode converter with minimum length of 5μm was demonstrated to provide the TE mode conversion while maintaining the polarization...
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