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New operation of interferometric OSNR monitor is investigated to support Nyquist superchannels. Power ratio for estimating OSNR in 10–30dB OSNR of 400G Nyquist DP-QPSK superchannel is largely improved and OSNR error less than +/-1dB with negligible impact from CD and PMD is achieved.
We propose a novel bit error ratio monitoring method by optical bandpass filter and optical power measurements and experimentally demonstrate its sufficient accuracy with various fiber launched powers and wavelengths in WDM dispersion-uncompensated transmission link.
We investigate a polarization-diversity PSA for polarization-insensitive phase regeneration of single- and dual-polarization phase modulation formats. We show effective reduction on phase noise insensitive to signal's polarization by simulations and preliminarily verify this PSA by experiments.
System tolerance of m-PSK optical phase regeneration was investigated. Chromatic dispersion tolerance shows strong dependence on signal's baud-rate and m-number. Polarization mismatch between pumps and signal reduces gain but has no impact on phase regeneration.
We propose a novel in-band OSNR monitor using an optical bandpass filter and power measurements for superchannel signals and experimentally demonstrate accurate OSNR monitoring of two-subcarrier DP-16QAM signal and higher tolerance to spectral narrowing.
Optical phase regeneration of QPSK by employing two signal conjugates in a dual-pump degenerate phase-sensitive amplifier is verified via simulations. Phase error standard deviation of 12.8270 is reduced to 3.3570. We further verify this scheme's scalability to support 8PSK.
Given huge amount of daily news articles, it would be helpful to users if the news reading time can be reduced. In this paper, we focus on single-document summarization for Chinese news articles with statistical methods. First, new vocabularies are collected from news articles, and verified with online translation services. These are included as the auxiliary lexicon. Then, statistical word segmentation...
Single-ring fiber can support 10 OAM modes while maintaining radially sing-mode condition. The crosstalk between the modes is less than −20 dB even in a 1%-ellipticity fiber. OAM0,4 can propagate 500-km with <10-ps mode walk-off.
We propose and demonstrate all-optical three-input quaternary hybrid addition/subtraction using non-degenerate FWM processes in an HNLF and DQPSK signals. When employing 100-Gbit/s RZ-DQPSK signals (A, B, C), we achieve 50-Gbaud/s three-input quaternary addition/subtraction (A+B−C, A+C−B, B+C−A) with power penalties less than 6 dB at a BER of 10−9.
We simulate and analyze the mode properties and propagation effects of orbital angular momentum (OAM) modes in a ring fiber. A ring fiber with 0.05 up-doping is designed in simulation to support up to 10 OAM modes while maintaining single-mode condition radially. With a multiple-ring fiber, tens of OAM modes can be potentially multiplexed to greatly enhance the system capacity and spectral efficiency...
The Gerchberg-Saxton algorithm based phase retrieval technique is used to correct the wavefront of distorted OAM modes. The simulation results show that this method can efficiently improve the mode purity of OAM modes up to 50% and reduce the crosstalk by about 20 dB.
We present OAM mode distortion monitoring by using an interferometer with π/2 phase-shift to reconstruct the phase profile without any movement of instruments. Monitoring of distortion caused by misalignment and atmospheric turbulence are successfully demonstrated.
As2S3 ring PCF is proposed for vortex modes. Two orders of magnitude improvement on mode separation is achieved. Engineered dispersion and high nonlinearity enable octave-spanning supercontinuum generation from 1196 to 2418 nm within 1-cm fiber.
We propose an approach to generate and multiplex 7 OAM spatial modes using a ring fiber launched by the light from multiple single-mode fibers. The purity of each OAM mode can be >99%.
We demonstrate all-optical sub-channel data erasing/updating based on cascaded sum-and difference-frequency generation in a single PPLN waveguide. OSNR penalty of 2-dB for RZ and 4-dB for NRZ at a BER of 2e-3 are achieved.
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.
By exploiting non-degenerate four-wave mixing in highly nonlinear fibers assisted by two phase-modulated pumps, we report optical multicasted hexadecimal coding/decoding of 16-QAM. Constellation manipulation for a 10-Gbaud/s 16-QAM signal is demonstrated with OSNR penalties of <2.4 dB for multicasted coding and <1.6 dB for decoding.
We propose a PSA scheme employing bi-directional signal-conjugate generations and then dual-conjugate-pump FWM for phase regeneration of QPSK/8PSK and potentially 16PSK. We show effective reductions on phase noise deviation by 5.2 and 8.5 degrees for 25-Gbaud/s 8PSK and QPSK and verify its scalability at 50-Gbaud/s.
We demonstrate generation/multiplexing/demultiplexing of polarization-multiplexed (pol-muxed) multiple orbital-angular-momentum (OAM) modes. High spectral efficiency of 25.6-bit/s/Hz is implemented using 10.7-Gbaud 16-QAM signals over pol-muxed four OAM modes. An OSNR penalty less than 3.5 dB is observed.
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