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We propose the use of differential code shift keying (DCSK) for a symbol rate adaptive low-complexity DSP algorithm by eliminating adaptive-equalizer (AEQ) with limited influence on circuit size. As a proof of concept, a 300km transmission using DCSK format was demonstrated without using AEQ.
An OSNR-aware adaptive optical transmission system using time-division-multiplexed pilot sequences is proposed. We successfully demonstrated that the system automatically optimizes signal form by using in-band OSNR estimation and a bidirectional feedback channel in filed-installed fiber.
We propose a highly reliable 40GbE extender based on OTL3.4 parallel transmission with 1.3μm CWDM and EFEC technologies. Error free transmission of a 40GbE signal over 50km SMF is successfully demonstrated.
Abstract: We successfully demonstrate transparent 10GbE-LANPHY transport in 44.6-Gbit/s RZ-DQPSK WDM transmission for the first time. A single-chip 43/44-Gbit/s OTN framer LSI that supports fully transparent STM-64/10GbE multiplexing and DQPSK precoding are adopted.
Transparent 10 GbE-LANPHY transport for 44.6 Gbit/s RZ-DQPSK WDM transmission is demonstrated for the first time. A single-chip 43/44 Gbit/s OTN framer LSI that supports fully transparent STM-64/10 GbE multiplexing and DQPSK precoding is adopted.
43-Gbit/s PMD-limited performances of CS-RZ and NRZ have been verified in a joint field trail. CS-RZ showed better performance than NRZ. 2/sup nd/-order PMD of 200 ps/sup 2/ was accommodated in principal state of polarization transmission with FEC.
PMD induced system outage probabilities have been measured in a joint field trial of NTT and DT. For outage evaluation 43-Gbit/s CS-RZ signals of the NTT WDM system were transmitted over selected high-PMD fiber links of DT's fiber network.
Frequency Diverse Detection Receiver employing error-correction mitigates PMD degradation. Permissible DGD is extended to 48% of the bit-period. Bit-by-bit error-correction is effective against the burst-errors caused by DGD fluctuation with respect to time and frequency.
A novel compact-spectrum RZ signal is proposed, its bandwidth is approximately twice the bit-rate. It is generated by a single-stage Mach-Zehnder modulator with 2:1 multiplexing function. 50 GHz-spaced 8times20-Gbit/s DWWM transmission is realized
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