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By employing N-dimensional multiplexing and modulation, i.e. 5.8-Gaud Nyquist 32-QAM signals over pol-muxed 52 orbital angular momentum (OAM) modes (104 channels in total), we experimentally demonstrate a free-space data link with an aggregate ultra-high spectral efficiency of 435 bit/s/Hz.
We present N-dimensional multicasting by exploiting wavelength/frequency, orbital angular momentum (OAM) and polarization dimensions. 1-to-1100 multicasting (25 wavelengths × 22 OAM modes × 2 polarizations) of OFDM-16/32QAM signal is demonstrated in the experiment. All 1100-fold multicasted channels achieve BER <2e-3.
Effects of radar pulse interference with high power on the communication data link system on a warship platform are investigated with the help of Simulink simulation platform and in-house developed MATLAB algorithm. Based on the established model of communication data link system, FDTD simulation is at first employed for simulating the induced voltage on the wire antenna of date link system in the...
By exploiting N-dimensional multiplexing, i.e. 54.139-Gbit/s OFDM-8QAM signals over 368 WDM pol-muxed 26 orbital angular momentum (OAM) modes, we experimentally demonstrate a free-space data link with an aggregate transmission capacity of 1.036 Pbit/s and a high spectral efficiency of 112.6 bit/s/Hz.
We design and fabricate a vertical hybrid SPP waveguide. The suitability of ultrahigh-bandwidth data transmission through the proposed waveguide by transmitting 1.8-Tbit/s (161 wavelength 11.2-Gbit/s) WDM OFDM 16-QAM is studied. The BERs of all 161 channels are less than 1e−3.
We report all-optical wavelength conversion of OFDM m-QAM signals by exploiting degenerate four-wave mixing (FWM) in a silicon waveguide. Low penalty silicon-waveguide-based wavelength conversions of OFDM m-QAM (m=16, 32, 64, 128) signals are successfully demonstrated in the experiment.
We present ultrahigh-speed transmission of 3.84-Tbit/s 64-QAM signal in Si ridge and Si slot waveguides. Si slot waveguide confining light in air slot region features reduced nonlinearity and resultant superior transmission performance with low penalty for varied input signal power from 1 to 250 mW.
It has long been held that errors in received noisy ciphertexts should be eliminated using as many as possible powerful error correcting codes in order to reduce the avalanche effect on legitimate users' performance in block ciphered systems. However, the negative effect of erroneous ciphertexts on cryptanalysis by an eavesdropper has not been well understood, nor the possible measurable trade-off...
We described recent progress on optical communications using light beams carrying orbital angular momentum (OAM). We achieved a 25.6-bit/s/Hz spectral efficiency using 16-QAM signals over pol-muxed four OAM beams. We obtained a 2-Tbit/s data link using 25-WDM-channel 40-Gbit/s NRZ-DPSK signals over two OAM beams.
We propose and demonstrate data exchange between two spatial modes carrying orbital-angular-momentum (OAM). Reconfigurable OAM exchange accompanied by 100-Gbit/s DQPSK data exchange is implemented. A total power penalty of less than 2.4 dB is observed at a BER of 1e-9.
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.
Employing 8PSK and 16PSK modulation formats, non-degenerate four-wave mixing (FWM) in a single highly nonlinear fiber (HNLF), and coherent detection, we experimentally demonstrate 40-Gbaud/s (120-Gbit/s) octal and 10-Gbaud/s (40-Gbit/s) hexadecimal simultaneous addition (A+B) and bidirectional subtraction (A-B, B-A).
We experimentally demonstrate a tunable optical generation of up to 40-Gbaud 16-QAM from a QPSK signal using a variable DGD element based on vector addition between two polarization states. We also show the baud rate tunability and investigate the tolerance of 16-QAM generation to the DGD offset.
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 demonstrate an approach of four-mode multiplexing/demultiplexing using orthogonal Laguerre-Gaussian modes carrying orbital angular momenta. High spectral efficiency of 12.8-bit/s/Hz is achieved using 10.7-Gbaud 16-QAM signals over four Laguerre-Gaussian modes. Crosstalk <-20 dB and OSNR penalty <2.4 dB are achieved.
To reduce the cost and complexity of receiver without losing much diversity gain, we propose an antenna selection scheme for MIMO systems employing non-constant envelope mapping. By detection of the received signal and a simplified process without any knowledge of channel statement information, this scheme can approach the ideal selection strategy. Single carrier system and STC-OFDM (space-time-code...
The frequency hopping (FH) communication systems are efficient systems for anti-jamming. When on the general partial-band jamming condition, the channel can be considered as burst jamming channel. In traditional FH systems, the Reed-Solomon (RS) codes are commonly used to correct the burst errors. A better form of coding may be nonbinary low-density parity-check (LDPC) codes, which have been shown...
We propose and demonstrate an optical-wireless integrated transmission scheme. Results show PON signal suffered only 0.3 dB power penalty and bit error rate of less than 10-6 for OFDM signal was achievable before FEC.
In this paper, we propose a blind beamforming technique for multipath CDMA channels, which requires prior knowledge of only the spreading code and the timing of the desired user. An orthogonal projection approach is used to isolate the interference and estimate its spatial covariance matrix to update the beamformer for each path. Data bits are recovered by combining the despreaded output of all beamformers...
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