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Using electron-beam-induced deposition and focused-ion-beam milling, we have fabricated and demonstrated a nanofocusing optical transformer with a 3-dimensionally tapered tip. At the tip, the light is confined to 13-by-80-nm area with intensity enhancement exceeding 1500.
A novel scheme using single phase modulator for simultaneous generating and decoding of time domain spectral phase encoded signal and DPSK data modulation is proposed and experimentally demonstrated for five 16-chip, 40GHz/chip optical code patterns.
We have successfully realized an optical frequency tunable Cs atomic clock with a mode-hop-free fiber laser. The optical frequency of the 9.1926 GHz clock was continuously tuned over 1 GHz without changing the clock frequency.
The operation of a 24 nm wavelength tunable self-starting, passively harmonic modelocked, figure-eight laser is experimentally demonstrated. Stable pulses with near half dutycycle are produced at repetition rates of up to 2.72 GHz at 1550 nm wavelength.
We report a high-power picosecond optical parametric oscillator synchronously pumped by a Yb fiber laser. The oscillator provides a total average power of 9.58 W at 60% extraction efficiency in a TEM00 spatial beam profile.
A 2.5Gbps two-user OCDMA transmission over 34km fiber with 8-chip, 20GHz/chip optical code pattern based on proposed time domain spectral phase encoding (SPE) and Variable-Bandwidth Spectrum Shaper (VBS) has been experimentally demonstrated with BER<10−9.
We discuss optical rogue wave generation in terms of collision processes. Simulations of picosecond pulse propagation in optical fibers show rogue soliton generation from either third-order dispersion or Raman scattering independently.
A silicon waveguide-based ultra-fast optical sampling system is successfully demonstrated using a free-running fiber laser with a carbon nanotube-based mode-locker as the sampling source. A clear eye-diagram of a 320 Gbit/s data signal is obtained.
We have developed an optical input module for single-flux-quantum (SFQ) circuit to achieve high-speed buffer memory in the optical packet switch. We succeeded in demonstrating SFQ pulse generation by optical pulse input with 100-ps width.
Balanced spectral interferometry is combined with dispersion-induced frequency-to-time mapping to achieve single-shot full (amplitude and phase) characterization of dynamical THz-bandwidth optical signals over sub-nanosecond time windows at unprecedented measurement update rates of nearly 20 MHz.
We report the theoretical and experimental demonstration of an all-optical temporal differentiator based on π-phase-shifted Bragg gratings fabricated in Silicon-on-Insulator waveguides. All-optical processing of sub-picosecond pulses was performed.
A semiconductor laser is mode-locked by phase modulation at one-half the free spectral range of an intra-cavity etalon. The optical comb-lines are locked to the transmission peaks of the etalon using a Pound-Drever-Hall scheme.
Lasing from population inversion is demonstrated from gas contained in a hollow-core kagome structured photonic crystal fiber. Laser pulses in the mid-IR (3.1-3.2 μm) were generated by optically pumping at λ ~ 1.5 μm.
A code-label recognition time of less than 500ps is demonstrated using low-cost FIR-filters. The electronically-processed label provides a control signal from an auto-correlated label. Error-free electronic code-label switching of an optical 10Gb/s signal is demonstrated.
A slab-coupled optical waveguide laser is wavelength stabilized with a fiber Bragg grating and characterized under a narrow pulse high repetition rate direct modulation scheme suitable for efficient pulse position modulation format optical communication systems.
We demonstrate an all-fiber-based apparatus built to generate near-infrared frequencies directly from an Er-doped fiber frequency comb. The amplified final output signal yields a frequency stability of 2×10−15 with a linewidth less than 1 Hz.
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