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We propose a straightforward algorithm to estimate second-order PMD from adaptive FIR-filter tap coefficients in a digital coherent optical receiver. The novel algorithm is verified with 100-Gbit/s dual-polarization QPSK experiments.
We propose a novel digital coherent receiver, where frequency subbands of an ultrafast optical signal are detected in parallel and synthesized with DSP. A proof-of-concept experiment performing two-subband decomposition and reconstruction for PSK signals proves effectiveness of the proposed scheme.
We propose a simple and precise algorithm to monitor multiple impairments such as CD, PMD, and PDL, which are jointly mitigated in the adaptive equalizer of a digital coherent optical receiver. We validate our algorithm by dual-polarization QPSK transmission experiments.
Constant modulus algorithm (CMA) with the training mode is demonstrated for accurate polarization demultiplexing and equalization in a digital coherent optical receiver. Proper polarization demultiplexing with the proposed method is experimentally verified.
Maximum-likelihood-sequence estimation (MLSE) is successfully introduced into the digital coherent receiver together with FIR filters. We can compensate for both linear and nonlinear impairments of 20-Gbit/s QPSK signals transmitted through a 200-km-long standard single-mode-fiber.
We demonstrate 1,000-km transmission of a 160-Gbit/s QPSK signal, using a digital coherent receiver with the time-division demultiplexing function, and confirm the applicability of such a receiver to long-haul transmission systems for the first time.
We demonstrate 1,073-km transmission of 640-Gbit/s dual-polarization QPSK signals using a digital coherent receiver with the time-division demultiplexing function. The bit rate-distance product is the highest among those reported in single-carrier coherent transmission systems.
Phase-noise tolerance of 10-Gsymbol/s 16-QAM signals is investigated both theoretically and experimentally. Optimizing the decision-directed phase-locked loop for carrier-phase estimation, we can obtain acceptable BER performance when the laser linewidth is in the 100-kHz range.
A 1.28-Tbit/s signal on a single carrier is generated by the combination of 16 time-division multiplexing, 16-QAM, and polarization multiplexing. Such a signal is demodulated with a digital coherent receiver having the time-division demultiplexing function.
The digital coherent receiver, which is a combination of a phase-diversity optical homodyne receiver and digital signal processing (DSP), can demodulate any multilevel coded optical signals without relying upon an optical phase-locked loop. However, the maximum symbol rate processed by such a receiver is limited by the speed of electric analog-to-digital converters and digital signal processors. Although...
We demodulate a 480-Gbit/s 8PSK signal with a digital coherent receiver having time-division demultiplexing function. The receiver sensitivity is -20 dBm at BER of 10-5.
We demonstrate 100-km transmission of a 40-Gbit/s 16-QAM signal using a digital coherent receiver. The receiver sensitivity of -30 dBm is obtained at BER=10-5.
We demonstrate unrepeated 200-km transmission of 40-Gbit/s 16-QAM signals. In spite of the launched power limitation due to SPM, the acceptable BER performance is obtained owing to high sensitivity of a digital coherent optical receiver.
We demodulate a 320-Gbit/s optical quadrature phase-shift keying (QPSK) signal using a novel digital coherent receiver, which features a function of time-division demultiplexing with a local oscillator pulsed at the 10-GHz base-clock frequency.
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