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Error-free polarization division multiplexed (PDM) 10-Gbps × 2-PDM transmission over a 3.7-km-long holey fiber in the 1-μm waveband, which are shown to be capable of 8.4-THz bandwidth transmission, is successfully demonstrated for the first time.
We demonstrated broadening of the comb bandwidth by constructing a feedback loop in a Mach-Zehnder-modulator-based flat comb generator. By multiple-modulation using the feedback loop, a broadband comb signal was generated.
We successfully demonstrated ultra-wideband frequency chirp signal generation using the DSB-SC modulation technique with pulse duration of 0.5 μs. A high extinction ratio optical modulator helps realize clear signals with no filters.
We demonstrate low phase noise characteristics of millimeter (MM) waves using Mach-Zehnder-modulator-based flat comb generator. MM waves are generated by beating optical two modes extracted from a comb signal. The rms phase noise of the signal measured at 37.5 GHz was 0.02 rad.
In this communication a new collection of THz spectra of artists' materials along with the definition of procedures followed in preparing the samples and in acquiring the spectra will be presented. In particular, this paper focuses on white and blue artists' pigments in the 0.1-20 THz region.
We report on 20 THz-wide optical frequency comb generation for wide-rage tunable MM and THz wave generation. A broadband comb signal was created from CW light by using a Mach-Zehnder modulator and a dispersion-flattened dispersion-decreasing fiber (DF-DDF). A comb signal was drastically broadened to 20 THz by increasing the input power to the DF-DDF. Our method is based on optical modulation using...
The portability of a terahertz imaging system is crucial for practical applications because most of the measured objects are generally fixed and cannot be moved from their locations. We have developed a portable imaging system using a terahertz quantum cascade laser and a microbolometer focal plane array. We also obtained a direct image of the focused beam of the laser.
Hierarchical OTDM/WDM system based on a waveband concept is demonstrated by use of an optical signal processing. Demonstrated key technologies are C- and L-waveband generation, waveband conversion, and 1-mum waveband transport for a new wavelength resource.
Optical comb generation is important for coherent WDM or OFDM systems that extremely improve spectral efficient of WDM systems. Mode-locked lasers are typically used for supercontinuum generation. However, the mode-locked lasers have some drawbacks in stability and tunability. A Mach-Zehnder modulator (MZM) based comb/pulse generator is good candidate for a comb source with high stability and high...
O-band InAs/InGaAs quantum-dot (QD) laser-diode has been successfully demonstrated by using sandwiched sub-nano separator (SSNS) structures on GaAs. Improvement of crystal-qualities and enhancement of luminescence intensities were attained for the QD laser by SSNS technique.
We proposed a method for millimeter and terahertz wave generation using a Mach-Zehnder-modulator-based flat comb generator, and showed a 100 GHz beat signal by extracting two modes from 12.5 GHz-spaced comb signals.
1-mum waveband, 12.5-Gbps transmission over a 1.5-km single-mode holey-fiber is demonstrated with clear eye-openings. A wavelength tunable single-mode selected quantum-dot optical frequency-comb laser is used as the optical-source potentially capable of wavelength division multiplexing (WDM).
1-mum waveband, 10 Gbps transmission over 1.5-km single-mode holey fiber is demonstrated with clear eye-openings. A wavelength tunable single-mode selected quantum-dot optical frequency comb laser is utilized as the optical source potentially capable of WDM source.
Broadband wavelength tunable femtosecond pulse generation has been demonstrated using a Mach-Zehnder-modulator-based comb generator. 200 fs, 10 GHz pulses were generated in the wavelength range of 1545 to 1570 nm.
We have demonstrated wideband frequency-tunable ultrashort pulse generation using a Mach-Zehnder-modulator-based flat comb generator (MZ-FCG) and a dispersion- flattened dispersion-decreasing fiber. Continuous wave lights were converted to ultraflat comb signals by the MZ-FCG. The comb signals were formed into picosecond pulse trains by chirp compensation, and they are compressed into femtosecond...
A 4-THz injection-seeding bandwidth (1042 -1057 nm) was successfully demonstrated with a 1-mum optical-waveband quantum-dot (QD) Fabry-Perot laser-diode. A Sb-molecule-sprayed InGaAs/GaAs QD structure in its active-medium was grown by molecular-beam-epitaxy with a GaAs-substrate.
O-band quantum-dot(QD) laser-diode(LD) has been successfully demonstrated with novel InAs dot-in-well structures employed on GaAs-wafers. Improvement of crystal-qualities and enhancement of electroluminescence-intensities have been brought about to the LD-devices by Sb-molecule around InAs-QDs during molecular-beam-epitaxy.
We fabricated laser diodes containing highly stacked InAs quantum dots (QDs) using the strain-compensation technique, which showed laser emission at 1.7 mum above the threshold current of 400 mA in pulsed mode.
GaAs nano-wire waveguides were successfully fabricated on a SiO2/Si substrate for the first time. 15 dB cross loss modulation was achieved by a few mW continuous-wave pump power within a 1.5 mm-long waveguide.
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