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This paper presents the design and implementation of a positioning system based on particle filters and a convex optimization processor. The positioning system uses a virtual base-station transform (VBST) and convex optimization algorithm to deal with the none-light-of-sight (NLOS) problem in wireless communication systems. This study designs a modified resampling particle filter to reduce the processing...
Mobile positioning in the cellular systems usually suffers great performance degradation caused by the non-light-of-sight (NLOS) effect in the urban area. Thus, this work proposes a novel virtual base-station transform (VBST) algorithm based on the particle filter and convex optimization. The proposed algorithm can virtually move the base stations to the light-of-sight (LOS) positions to the mobile...
We experimentally demonstrate optical multiplexing of 40-Gbit/s channels at different wavelengths onto a single 640-Gbit/s channel and subsequent 640-to-10-Gbit/s demultiplexing using cascaded nonlinear optical loop mirrors. An average penalty of ~3.5 dB at 10-9 BER is observed after the nonlinear processes.
We present a 2.3-Tbit/s network switching element by exploiting double-pass LCoS technology and bidirectional nonlinear effects inside a single HNLF. We demonstrate 2.3-Tbit/s grooming switch with simultaneous functions of add/drop, data exchange, and power equalization, for 23-channel 100-Gbit/s RZ-DQPSK signals.
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.
We experimentally demonstrate optical multiplexing of two 20-Gbit/s QPSK channels at different wavelengths onto a single 40-Gbit/s star 16-QAM channel with tunable ring ratio using cascaded fiber-based nonlinear stages. The impact of QPSK channel spacing is also investigated. BER measurements confirm the effectiveness of the proposed scheme.
We report phase-transparent DQPSK data exchange using parametric depletion in a highly nonlinear fiber. 100-Gbit/s DQPSK data exchange is demonstrated with a power penalty less than 5dB. Pump misalignment tolerance (+/-2ps) and input signal power dynamic range (~20dB) are investigated.
We demonstrate a scheme for reconfigurably selecting multiple tributaries of a 640-Gbit/s signal using cross-phase modulation in cascaded nonlinear optical loop mirrors (NOLMs). An average penalty of ~3.5 dB is introduced by each NOLM after arbitrarily selecting two 40-Gbit/s tributaries and subsequently redistributing them.
We report tributary channel data traffic grooming/exchange of pol-muxed DPSK signal based on Kerr-induced nonlinear polarization rotation. 8 tributary channel data grooming between two pol-muxed 80-Gbit/s DPSK channels is demonstrated with a penalty of <4 dB.
We experimentally demonstrate simultaneous two-channel wavelength conversion of 40-Gbit/s RZ-DPSK WDM signals using four-wave mixing (FWM) in a highly nonlinear fiber (HNLF) without additional pumps. A power penalty of <1 dB is observed as channel spacing varies from 200 GHz to 1 THz.
We demonstrate tributary channel data grooming of high-speed signals using second-order nonlinearities in a PPLN waveguide. 16 TDM tributary channel data traffic grooming/exchange between two 160-Gbit/s WDM signals is shown with a penalty of ~4 dB.
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