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Programmable FBG-based optical correlators for optical code division multiplexing systems, which are able to change carrier phase of output pulses, are experimentally demonstrated. Phase shifts between adjacent FBGs are tuned thermally with small thermo-electric controllers by PWM signals from a microprocessor. Easy code adaptation with the programmable FBG-based optical correlator is successfully...
A novel all optical single side-band signal generation filter using optically phase shift scheme with fiber Bragg grating based 4-taps optical Hilbert transformer is experimentally demonstrated. The sideband suppression ratio above 10 dB shows the feasibility of the optically phase-shifted SSB scheme which is applicable for high-speed transmission with bandwidth efficiency.
Experimental demonstration of a 24 GHz-band ultra wideband impulse radio (UWB-IR) pulse generation has been reported. The generated UWB-IR pulse has 24.7 GHz of a center frequency and 9.4 GHz of a -10 dB bandwidth.
Water vapor distribution in the lower atmosphere was observed using two optical lidars (ceilometer) set up at the distance of 3.1 km. Range height indicator (RHI) display was constructed from two time series data measured by each lidar. The instruments were also included small vertical radar and snowfall gauge. All the data were displayed on the same coordinate system to compare the profiles with...
The FCC-compliant UWB-IR pulse radar was reported. Thanks to the ultra short pulses, which have a lOdB bandwidth of 7.23GHz, the investigated UWB-IR pulse radar was able to resolve the relative positional change of the target for reflection with a high spatial resolution less than 10 mm, resulting in the collect identification of the complex shaped target. Improvement of the migration process by considering...
The low cross-correlation property and easy code adaptability of a novel complex-valued OCDM code, the Fourier code, have been demonstrated experimentally. It shows 4.8 dB smaller cross-correlation than the frequently used binary Hadamard code.
We proposed a method to generate pulsewidth-tunable carrier-suppressed (CS) optical pulsetrain from a mode-locked distributed Bragg reflector (DBR) laser diode (LD) operating with two carrier wavelengths. Our new method made it possible to generate the CS pulsetrains with widely tunable duty ratios of both more and less than 0.5 from a single chip of semiconductor device. With theoretical explanation...
The new optical coupling without any interference phenomenon is proposed. Using this, GRIN-coat, we can simplify the connection of all optical components; GRIN lens, fibers, filters, etc, into simple contact with the super wide range Anti-Reflection effect.
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