Fumikazu Inuzuka

Compensation of Interchannel Crosstalk Induced by Optical Fiber Nonlinearity in Carrier Phase-Locked WDM System

A scheme that compensates the waveform distortion induced by nonlinear interchannel crosstalk such as four-wave mixing (FWM) and cross-phase modulation as well as self-phase modulation in phase-locked wavelength-division-multiplexing transmission systems is proposed. Reduction of FWM-induced waveform distortion by controlling the phase relationship between neighbouring channels and its cancellation by precompensation is successfully demonstrated

100 Gbit/s All-Optical OFDM Transmission Using 4 × 25 Gbit/s Optical Duobinary Signals with Phase-Controlled Optical Sub-Carriers

This paper proposes 100-Gbit/s optical-OFDM transmission using the ODB format. An OFDM signal generated using a simple multi-carrier generator and multi-carrier modulator is successfully transmitted over a 20-km SMF and 100-km DSF without dispersion compensation.

Bit-rate-flexible all-optical OFDM transceiver using variable multi-carrier source and DQPSK/DPSK mixed multiplexing

We propose and demonstrate a bit-rate-flexible all-optical OFDM transceiver. Signals were successfully generated at 107, 42.8, 32.1, and 10.7 Gbit/s and received through the transceiver. The 107-Gbit/s signal was successfully transmitted over 40-km-SMF without dispersion compensation.

Achievement of Subchannel Frequency Spacing Less Than Symbol Rate and Improvement of Dispersion Tolerance in Optical OFDM Transmission

We propose a novel optical orthogonal frequency-division multiplexing (OFDM) transmission, where the frequency spacing of subchannels is less than the symbol rate. We show experimentally that the novel OFDM transmission achieves an optical SNR (OSNR) sensitivity level and dispersion tolerance roughly equivalent to those of the conventional OFDM. We also show the influence of chromatic dispersion from the transmission channel on the OFDM signal. The chromatic dispersion causes a desynchronization of the symbol timing between subchannels and breaks the frequency orthogonality in OFDM. We confirm experimentally that it is possible to mitigate the signal degradation due to the chromatic dispersion by optimizing the symbol timing and orthogonally polarizing the subchannels to the neighboring subchannels.

Nonlinear Inter-Channel Crosstalk Compensation Using Electronic Pre-distortion in Carrier Phase Locked WDM

This paper shows electronic pre-compensation of nonlinear inter-channel crosstalk induced by four-wave mixing in 3-channel carrier phase-locked WDM. Experimental results show that carrier phase locking and electric pre-distortion successfully suppress the waveform distortion.

Inter-channel crosstalk cancellation by encoding with adjacent channels in coherent WDM

A pre-compensation technique for inter-channel crosstalk cancellation in a dense WDM system is proposed and experimentally demonstrated. Waveform distortion caused by inter-channel crosstalk is canceled out at receiver by encoding each channel using its own data and its adjacent data.

Nonlinearity compensation in WDM transmission

This paper introduces a technique that compensates for nonlinear inter-channel crosstalk in wavelength division multiplexing (WDM) transmission. Electronic pre- and post-compensation of four-wave mixing are experimentally shown in carrier phase-locked WDM.

Digital Compensation of Intercarrier Nonlinear Distortion With Carrier Phase Locking

Compensating for intercarrier nonlinear distortion allows launching higher power into the transmission fiber and it leads to an increase in the transmission distance. Numerical calculations show that the launch power is increased by 10 dB and the maximum transmission distance is more than tripled, when the optical repeater spacing of 80 km, dispersion-shifted fiber, and signal format of 10 Gb/s nonreturn-to-zero are assumed. It is experimentally demonstrated that waveform distortion due to the four-wave mixing (FWM) among different carriers in wavelength-division multiplexing (WDM) becomes deterministic by phase-locking optical carriers and that FWM distortion can be compensated at 5 Gb/s with three-channel condition by employing DSP at the transmitter or receiver.

Nonlinear Inter-Channel Crosstalk Compensation in Carrier Phase Locked WDM

The concept of nonlinear inter-channel crosstalk compensation in phase-locked WDM transmission systems is proposed. Cancellation of FWM-induced waveform distortion by pre-compensation and its reduction by proper setting of the phase relationship between neighbouring channels are successfully demonstrated.

Demonstration of wavelength-convertible OBS with multi-optical code labeled control packet using single en/decoder

A multi-optical code labeled control packet generation and processing using multi-port AWG-type optical en/decoder and the parametric wavelength conversion using QPM-LN converter of data payload is experimentally demonstrated for low-latency and wavelength-convertible optical burst switching.