A5083844725- Optical Network Technologies
- Advanced Photonic Communication Systems
- Photonic and Optical Devices
- Advanced Fiber Laser Technologies
- Photonic Crystal and Fiber Optics
- Advanced Fiber Optic Sensors
- Advanced Optical Network Technologies
- Semiconductor Lasers and Optical Devices
- Synthetic Organic Chemistry Methods
- PAPR reduction in OFDM
- Neural Networks and Reservoir Computing
- Optical Systems and Laser Technology
- Asymmetric Synthesis and Catalysis
- Spectroscopy Techniques in Biomedical and Chemical Research
- Optical and Acousto-Optic Technologies
- Photonic Crystals and Applications
- Optical Coherence Tomography Applications
- Terahertz technology and applications
- Laser-Matter Interactions and Applications
- Glass properties and applications
- Photorefractive and Nonlinear Optics
- Optical Wireless Communication Technologies
- Magneto-Optical Properties and Applications
- Synthesis and properties of polymers
- graph theory and CDMA systems
Osaka University
1989-2020
Asahi Glass (Belgium)
2005-2009
Asahi Glass (Japan)
2002-2009
The University of Tokyo
1991-2005
Yamaguchi University
1991
National Institute on Aging
1987
National Institutes of Health
1987
Clermont Université
1987
Kobe University
1985-1987
We demonstrate a resolution upgrade toward 6 bit optical quantization using power-to-wavelength conversion without an increment of system parallelism. Expansion full-scale input range is employed in conjunction with reduction step size keeping sampling-rate transparency characteristic over several 100 sGS/s. The effective number bits estimated to 5.74 bit, and the integral nonlinearity error differential are less than 1 least significant bit.
In this letter, we report the experimental demonstration of a 40 GSample/s all-optical analog to digital converter (ADC). The proposed ADC consists optical quantization and coding processes based on intensity-to-wavelength conversion by soliton self-frequency shift with an sampling process using ultrastable pulse train. A 5-GHz sinusoidal input signal was successfully converted digitized output in real time no degradation resolution. (High rate operation may lead resolution due reduction...
The unique and practical benefits of the use bismuth-oxide-based nonlinear fiber (Bi-NLF) in implementing a four-wave-mixing (FWM)-based wavelength converter for fiber-optic-communication-system applications are experimentally demonstrated. First, Kerr-nonlinearity stimulated-Brillouin-scattering (SBS) characteristics our fabricated Bi-NLF investigated. is found to have superior advantage significantly high SBS threshold addition its ultrahigh Kerr nonlinearity /spl gamma/ sim/1100 W/sup...
We demonstrate widely tunable wavelength conversion based on four-wave mixing using a dispersion-shifted bismuth-oxide photonic crystal fiber (Bi-PCF). A 1-meter-long Bi-PCF is used as the nonlinear medium for of 10 Gb/s non-return-to-zero (NRZ) signal. 3- dB working range converted signal over 35 nm obtained with around 1-dB power penalty in bit-error-rate measurements.
We experimentally realize seamless operations with below 100-fs timing jitter in a 10-GSample/s 3-bit photonic analog-to-digital converter (ADC) an input 2.5-GHz sinusoidal electrical signal. To address the energy efficiency, it is necessary to explore some serial approaches get most ADC done before serial-to-parallel conversion save number of devices. press forward work on subsequent after optical sampling ADC, we have investigated quantization and coding demonstrated their performances....
We experimentally demonstrate a compact and tunable four-wave-mixing-based wavelength converter using Bi/sub 2/O/sub 3/-based nonlinear fiber (Bi-NLF). An only 40-cm-long Bi-NLF is used as optical medium for conversion of 40-Gb/s nonreturn-to-zero (NRZ) signal with no additional stimulated Brillouin scattering (SBS) suppression scheme. The in this experiment has an extremely high SBS threshold owing to both its short length relatively low gain. 40-cm fusion-spliced standard single-mode...
The implementation of all-optical logic gates XOR and AND operable at 40 Gbit/s using polarisation switching within only 1 m length a fabricated Bi-NLF is experimentally demonstrated. two functions are obtained in single device by simply changing the states input signals relative to that probe beam.
Power-efficient, flexible, Nyquist 4.88-ps sinc-pulses generation and OTDM multiplexing is demonstrated, using fractional Fourier transform subcarriers time-lens effect. users are generated multiplexed by a WSS, without rectangular spectral shaping.
Highly nonlinear normally dispersive bismuth-oxide fiber shows promise for applications such as supercontinuum generation and femtosecond pulse compression in the telecommunications-wavelength range. To generate a wideband flat spectrum, balance between nonlinearity normal group velocity dispersion (GVD) is important. exhibits large due to small effective area index of host glass material. The also has relatively profile over wavelength Utilizing these features, we smooth unstructured 1200...
We investigate the feasibility of use 1-m length our fabricated bismuth oxide-based nonlinear fiber (Bi-NLF) for implementation a Mamyshev-type 2R regenerator that is based on self-phase-modulation-induced spectral broadening followed by filtering, and evaluate regeneration performance in both experimental theoretical ways from perspective system application. Owing to excellent dispersion /spl chi//sup (3)/ nonlinearity characteristics 1-m-long Bi-NLF, S-shape power transfer curve readily...
We demonstrate for the first time optical fractional OFDM system, based on intermediate grids between and frequency axes. Using reconfigurable wavelength selective switches, we demonstrated open eye diagrams, performance below FEC-limit.
We experimentally demonstrate that the use of only 1-m length our fabricated Bismuth oxide-based nonlinear fiber readily allows for implementing a high-performance 10-Gb/s nonreturn-to-zero signal wavelength converter based on cross-phase-modulation-induced polarization rotation. No stimulated Brillouin scattering (SBS) suppression scheme was employed owing to high SBS threshold fiber. Our is shown provide pattern-inverted or noninverted output in same configuration depending relative...
Error-free wavelength conversion of a 160 Gbit/s OTDM signal by use 1 m length fabricated bismuth oxide-based nonlinear fibre as medium generating cross-phase modulation-induced birefringence is demonstrated. Wavelength tuning over 10 nm range also achieved.
We explore the ultimate potential offered by state-of-the-art Bismuth oxide-based optical fiber technology in a high-speed phase-locked loop-based clock recovery subsystem for an time-division multiplexed (OTDM) signal, which use of fiber-based devices has been considered to be inappropriate due its tight requirement short loop length. Here, we experimentally demonstrate implementation compact all-fiber-based OTDM receiver incorporating both and demultiplexing functions lengths nonlinear...
We demonstrate the use of an only 40-cm-long Bi/sub 2/O/sub 3/-based nonlinear fiber with /spl gamma/=1100 W/sup -1/km/sup -1/ to obtain FWM-based wavelength conversion. Error-free conversion 40-Gbit/s NRZ signals over sim/10 nm is achieved without any SBS suppression scheme.
We experimentally investigate the realization of low power consumption optical quantization with 7-bit resolution. confirm resolution improvement without increment signal by incorporating spectral compression technique using a phase modulator.
We propose and demonstrate advanced optical pulse signal profiling using a high-nonlinear fiber, which works as distributable "optical ruler". Additionally, we assess its performance by comparison with conventional instruments.
Propagation loss and practical fusion-splicing of bismuth-based fibers are reduced to 0.8 dB/m 2.6 dB/point, respectively, while maintaining high nonlinearity 1100 W/sup -1/ km/sup by modifying the glass composition eliminating cladding mode.
We present a power-efficient and reduced-complexity all-optical approach to generate high-bit rate superchannels, based on joint time-frequency multiplexing. Both optical orthogonal frequency division multiplexing (OFDM) Nyquist-optical time (N-OTDM) signals are generated processed using wavelength-selective switch (WSS). use the fractional Fourier transform (FrFT) introduce largest degree of flexibility in networking, we experimentally demonstrate that transmitted signal can be received...
We propose a novel PAPR management technique using fractional Fourier transform subcarriers and time-lens effect. By deforming high OFDM signal into low Nyquist pulse train in fibre links, distortions by nonlinearity are mitigated.