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We have been investigating ultrahigh resolution optical coherence tomography using supercontinuum. Low noise, Gaussian like supercontinua were generated at five wavelength regions. Ultrahigh resolution cross-sectional and three dimensional imaging were demonstrated for biomedical tissues and materials.
This paper describes recent progress of highspeed lithium niobate (LN) modulator technologies for digital and analogue applications. LN provides precise and high-speed optical modulation. Various types of signals can be generated by using integrated devices.
We generate optical short pulses with asymmetric waveforms using an optical pulse synthesizer and successfully demonstrate their temporal magnification and reversal.
Dual-focus microlenses combining dual layers of spherical lens are proposed and fabricated through dual photo lithography processes and a dry etching process. Two types of dual-layered microlenses are fabricated, one with a combination of a small lens on a large lens and another combination of a small low-index lens within a large highindex lens.
Signal transmission performance by the variation of bias current to LED is investigated for the purpose of dimming control in carrier allocation based visible light communication system.
Optical QPSK label recognition using time-to-space conversion, spatial two-dimensional correlation and postprocessing with slits and a delay compensator is proposed. Two-symbol labels at with a reference pulse 160 G baud are numerically proved to be distinguished.
The convergence of electronics and photonics on silicon CMOS will allow an ultrawide bandwidth with reduced power consumption. Furthermore, this convergence will also be beneficial for emerging applications in energy and medical areas in a near future.
Basic concept and key structures of free-space wave add/drop multi-/demultiplexers are presented and discussed for wide-band WDM optical-interconnect system in package. Integrated-optic input/output couplers are also compared and discussed.
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