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We synthesized Ca-rich Bi-based superconducting whiskers by an Al2O3-seeded glassy quenched platelet method. The grown whiskers were precisely characterized by synchrotron radiation X-ray photoemission spectroscopy and high-resolution transmission electron microscopy. The Ca-rich Bi-based superconducting whiskers show a high critical current density of 2 × 105 A/cm2 at 40 K in self-field. We found...
In order to determine the optimal training symbol interval, we have experimentally evaluated the tolerable polarization change in PDM-OFDM systems. It was confirmed that the allowable polarization change is 0.17 radians in a TS interval of 20.88 μs.
A generalized symbol-rate-increased (GSRI) pragmatic adaptive trellis coded modulation (ATCM) applied to a multi-carrier CDMA system with bi-orthogonal keying is analyzed. In, an efficient ATCM scheme using GSRI-TCM has been proposed. However, since the modulation and coding selection is based on the ideal SNR estimation method, performance evaluations employing practical channel estimation scheme...
In this paper, we investigate the performance of MC-CDMA with bi-orthogonal keying employing Generalized Symbol-rate-increased (GSRI) Pragmatic Adaptive Trellis Coded Modulation (ATCM). It is advantageous that the GSRI TC-MPSK can arbitrarily set the bandwidth expansion ratio (coding rate) and higher coding gain than the conventional pragmatic TCM scheme can be obtained. By changing the modulation...
8 times 66.8-Gbit/s DWDM transmission is demonstrated over 640-km SSMF with 9-GHz channel spacing. Employing coherent detected polarization-division-multiplexing OFDM with 16-QAM subcarrier modulation, a record spectral efficiency of 5.6 bit/s/Hz is achieved.
The influence of the dispersion map is studied on the nonlinear tolerance of OFDM transmission systems. We show that the nonlinear tolerance is severely degraded when inline dispersion compensation is employed in the transmission line.
We show that the tolerance of 100GbE PDM-OFDM with respect to narrowband optical filtering is comparable to that of its single-carrier counterpart. This translates into a comparable spectral efficiency of OFDM and single-carrier modulated signals.
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