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A novel design of a PiN electro-optical modulator is proposed. A PN junction tunneling structure is inserted into the intrinsic region of the PiN EO modulator. Theoretical study shows a speed improvement of two times.
The four-wave mixing (FWM) analysis is successfully applied on the injection-locked quantum dot (QD) laser for linewidth enhancement factor extraction. The rate equation model of the QD lasers is simplified and the analytical model for the FWM analysis is derived and verified. By fitting the experimentally obtained regenerative signals and power spectrum signals at different detuning frequencies with...
Several attractive classes of LDPC codes including quasi-cyclic (QC), convolutional, staircase, and spatially-coupled codes are described. We show that these classes of LDPC codes can be derived from QC-LDPC code design. We demonstrate that record coding gains can be obtained from properly designed irregular QC-LDPC codes.
We present an all optical technique to demodulate THz signals on optical carriers using a standard optical phase modulator and an RF synthesizer. Noise floor as low as −95 dBc/Hz is reached at 700 GHz.
Polarization resolved optical spectral analysis of multimode, oxide-confined asymmetric VCSELs is presented. High-extinction-ratio polarization switching has been observed even in the multimode regime of these VCSELs. Furthermore, high-frequency polarization modulation of over a GHz with gated RF electrical modulation has been achieved.
We demonstrate optical demultiplexing of a QPSK signal into two BPSK sub-channels based on coherent vector addition of original signal and the phase conjugated copy respectively. Both sub-channels of a QPSK signal are extracted simultaneously and independently using a scalable phase sensitive amplification technique. This phase sensitive method potentially may also be applied to higher level QAM signals.
The 100Gbit/s compact transmitter module for CFP4 is presented for the first time, where the optical multiplexer, quad-channel LD driver, and four laser diodes are all integrated in the small package. The very clear eye openings at 25Gbit/s are confirmed with very low power consumption up to 1.2W in the case temperature range from −10 to 75 degC.
Metasurfaces based on sub-wavelength patterning have major potential for realizing arbitrary control of the wavefront of the diffracted light by achieving local control of the phase, amplitude and polarization. While our prototypes are based on optical antenna array the concepts are more general and can also use sub-wavelength spaced dielectric resonator array. We discuss novel devices based on this...
Optical saturable absorption through monolayer graphene vertically inserted between fibers and overlaid on an ion-exchanged waveguide was measured for picosecond switching application. Modulation depth of absorption larger than 10dB was obtained in the latter structure.
We report microresonators with the highest Q on a double-layer SOI material platform developed using wafer bonding. We also demonstrate 2 µm radius resonators with Q's>20k which are the most compact resonators on such platforms.
The paper introduces optical nano-hair structures made from high-κ dielectrics that can be used to impart an arbitrary phase function to the transmitted beam. The concept behind the design of these new structures is elaborated.
Monodispersed silver nanoparticles were prepared by applying electric field on unipolar charged nanoparticles fabricated using heterogeneous condensation technique in gas media. Strong plasmon resonances were observed for thin films containing monodispersed silver nanoparticles.
We report the observation of an optical topological transition in the iso-frequency surface of a non-magnetic anisotropic metamaterial. Enhancement in the photon density of states is demonstrated as a result of this transition.
Engineered polaritonic metamaterials are shown to enhance nanoparticle optical trapping and sensing ability via cylindrical channel hybrid plasmon-polariton resonances. Geometric features supporting spatially and time-varying optical potentials that define polaritonic force landscapes are investigated.
We investigate the optical absorption enhancement in molecular OPVs, in which an ultrathin Ag nanogrid is employed as a transparent electrode. A very high total photon absorptivity of 0.49 is predicted for such OPV architecture.
In this paper we report on our recent progress on the next generation photonic storage. The incorporation of the super-resolution and nanophotonic techniques enables the photonic storage with an ultra-high capacity approaching 1 Petabytes/disc, a two-order of magnitude enhanced information security and an ultra-long lifetime.
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