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We analyze the system performance of a novel ring-resonator circuit for simultaneous Nyquist pulse shaping and (de)multiplexing, which features a roll-off factor of 0.025 and is able to dramatically reduce the digital signal processing workload.
We experimentally demonstrate an 8 × 40 Gb/s all-optical coherent-OFDM system using an on-chip 1 × 8 Fourier-transform based on a modified arrayed-waveguide grating router, showing simultaneous receiving of 8 subcarriers with similar signal qualities.
By pre-coding data across polarizations, the performance degradation due to PDL can be largely mitigated without any coding overhead. Experimentally, this technique shows more than 2-dB Q2 improvement for PDM-QPSK with 6-dB worst-case PDL.
Many of today's online news websites have enabled users to specify different types of emotions (e.g., Angry and shocked) they have after reading news. Compared with traditional user feedbacks such as comments and ratings, these specific emotion annotations are more accurate for expressing users' personal emotions. In this paper, we propose to exploit these users' emotion annotations for online news...
Robust localization and navigation are essential for the success of robotic exploration, especially in remote and harsh environments. Navigation in feature-less areas becomes challenging when laser scanners or cameras can not provide relative or global localization. Moreover, complementary positioning solutions like a Global Navigation Satellite System or mobile radio based localization are not available...
We experimentally compare Nyquist-WDM and continuous DFT-S-OFDM systems with 16×64-Gb/s PDM-16QAM signals over 800-km SSMF. The DSP implementations of both systems with fractional oversampling rate are investigated, experimental results show that Nyquist-WDM system performs better with the same processing complexity.
In the field of engineering technology components, electromagnets are widely used. its performance tests are as hot spots, force characteristics effect the whole electromagnetic actuators, it is very necessary to do research on this. The paper finish it with a test stand, on the one hand, the test stand can measure relationship between displacement and force, get static test result. On the other hand,...
We present experimental results detailing the performance of terabit per second super-channels with varied sub-channel baud rates. We find that nonlinear penalties are minimized when using 3–4 Gbd for 4800 km transmission.
We experimentally demonstrate mid-span spectral inversion (MSSI) of a Nyquist wavelength-division multiplexing (N-WDM) 526-Gb/s 16-QAM superchannel over an 800-km link. MSSI improves the robustness of blind carrier phase recovery in the nonlinearity-limited region.
We investigate the relationship between matched filtering and blind equalization for a Nyquist-WDM system. With a Nyquist PDM-16QAM experiment, we show that frequency domain blind equalization leads to a computational efficient adaptive equalizer design.
We experimentally demonstrate 16.77-Tb/s multichannel Nyquist WDM using multiple subchannels per modulator to allow optimization of baud rate and nonlinear performance. After 400-km transmission, the 257×65.3-Gb/s bands had an average BER of 2.3×10−3.
Cooperative swarms of robots with cameras can provide stereo and multi-view vision. They are robust against failures and introduce diversity in the case of poor conditions. Cameras are used both for data acquisition and navigation. Additional sensors also play a role in the SLAM tasks (Simultaneously Localization and Mapping). The independent mobility of the robots/cameras leads to a situation in...
Implicit training for channel estimation in long-haul single-carrier polarization-multiplexed coherent optical systems has been experimentally demonstrated. Improved performance can be achieved by applying iterative channel estimation for up to 1900-km QPSK and 1000-km 16-QAM transmissions.
In Mars exploration tasks, robotic swarms containing multiple autonomous units are efficient and robust against hazards in the mission. However, when the swarm travels significantly far away from the base, it is not sufficiently reliable to use the local map generated during the exploration alone to return. We propose a return-to-base navigation system for swarm exploration tasks using a radio link...
We present an approach to eliminate the data-induced interference to the channel estimation of implicit training-aided coherent optical systems by removing the cyclic mean of the transmitted signal. The proposed method shows large improvement in both QPSK and 16-QAM experiments, and can achieve comparable performance as the blind adaptation scheme.
We present a coherent single-carrier system with optimized channel estimation and low-complexity fractionally-spaced frequency-domain equalizer. The concept is experimentally demonstrated for QPSK and 16-QAM systems to enable substantial overhead and complexity reduction without performance degradation.
A brief analysis of the need of the auto-running feature is given and some abnormal issues when designing the auto-running feature are discussed. A “first mission planning, automatic running afterwards” working flow is proposed and a detailed design scheme is described. Two key strategies of setting up the AGC parameters and initializing the scans are analyzed and effective solutions are proposed...
We report a two-stage frequency domain equalization method for non-data-aided coherent polarizationmultiplexed 16-QAM system. Robust performance against polarization-mode-dispersion and long-haul transmission is experimentally demonstrated using cascaded blind CD compensation and dual-mode adaptive equalization.
The home and abroad status of kW-class fiber laser is investigated. And the achievable method of kW all fiber laser and manner of controlling mode are analyzed. The ways of master-oscillator power amplifier which includes a master oscillator stage and a booster amplifier stage were used. The continuous laser of 1.08μm, biggest output power of 1.05kW is achieved respectively. And the optical-optical...
We propose and experimentally demonstrate a novel frequency-domain blind equalizer based on the multi-modulus algorithm for the 16 QAM coherent optical system. The algorithm is shown to have good performance over a long transmission distance.
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