Takashi Kotanigawa

Field transmission by using a commercially-ready 43 Gbit/s DWDM system employing RZ-DQPSK transponders in high PMD installed fiber

Using a commercially-ready 40-lambda DWDM system, RZ-DQPSK is confirmed to offer excellent DGD tolerance, up to 25 ps, through high PMD installed DSFs.

Hybrid 40-Gb/s and 100-Gb/s PDM-QPSK DWDM transmission using real-time DSP in field testbed

We demonstrate hybrid 40-Gb/s and 100-Gb/s PDM-QPSK DWDM transmission using real-time DSP in 580-km DSF-installed field testbed. The nonlinear crosstalk penalty due to the hybrid transmission of less than 0.5 dB is confirmed.

Field trial of simultaneous 100-Gbps and 400-Gbps transmission using advanced digital coherent technologies

We achieve double the performance in 400-Gbps optical transmission employing advanced digital coherent technologies based on field trials. Additionally, we show stable transmission of 400-Gbps channels that does not affect the existing 100-Gbps channels.

43 Gb/s Pre-chirped RZ DQPSK WDM Signal Transmission over 500-km and 12 OADM Nodes

43Gb/s Pre-chirped RZ-DQPSK WDM signal is successfully transmitted over 500-km with 12 OADM nodes. Pre-chirping suppresses the nonlinear penalty of WDM signals even though each has a level of different accumulated dispersion.

Field trial of 43-Gbit/s RZ-DQPSK transmission in aerial fiber with rapidly changing SOP

We use long-term SOP measurements to assess the characteristic of SOP change in aerial fiber. We demonstrate field transmission of 43-Gbit/s RZ-DQPSK signals in aerial fiber with rapidly changing SOP; the results confirm stable transmission.

High-density multi-carrier optical transmission using MIMO-based subcarrier crosstalk compensation

We analytically evaluate the transmission performance through 480-km WDM transmission of 256-Gb/s high baud rate single carrier signal and multicarrier signal with different number of subcarriers employing MIMO-based crosstalk compensation. We verify the effectiveness of multi-carrier transmission system employing MIMO-based crosstalk compensation achieves Q improvement at the sub-carrier spacing corresponds to approximately 88 % of the signal baud rate with two-sub-carrier PDM-QPSK signals.

Evaluation of maximum ratio combining in route diversity transmission and application to hitless optical path switching in field installed fibre

Hitless optical path switching using maximum ratio combining in route diversity transmission is successfully achieved under the condition of a field environment even if there are large polarization mode dispersion and fibre nonlinearities.

OSNR enhancement using a novel pump-wavelength detuning scheme for forward-pumped distributed Raman amplification in a 40 Gb/s-based WDM in-line amplifier transmission system

OSNR enhancement by using a novel pump-wave length detuning scheme for forward-pumped distributed Raman amplification in a 40 Gb/s-based L-band WDM in-line amplifier transmission system is experimentally verified for the first time.