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A compact 4 25-Gbps optical transceiver for short-reach communications using optical interconnects was developed. Its total power consumption is 2.2 W. A transmission experiment with the transceiver was successfully conducted at 25-Gbps data rate.
This paper reviews our recent activities on nanophotonics based on a photonic crystal (PC)/quantum dot (QD)-combined structure for an all-optical device and a metal/semiconductor composite structure using surface plasmon (SP) and negative refractive index material (NIM). The former structure contributes to an ultrafast signal processing component by virtue of new PC design and QD selective-area-growth...
The phase shift of signal pulse due to carrier excitation in quantum dots (QDs) induced by repetition control pulses is measured by two-color pump/probe measurements to investigate the effects of repetition frequency on the switch operation.The result suggests the possibility of beyond 40 GHz repetitive switch operations in photonic-crystal-based Mach-Zehnder (PC-SMZ) by using QDs with faster decay...
A two-dimensional photonic crystal (2DPC) slab waveguide-based symmetric Mach-Zehnder type all-optical switch (PC-SMZ) is promising for a future ultra-fast photonic network system. An ultra-fast (~ps) and ultra-low energy (~100 fJ) switching has already been demonstrated as the 1st phase. The 2nd phase is to create a PC-SMZ-based ultra-fast photonic logical switch with a latch function for an ultra-fast...
One of the exciting features of photonic crystals is that light may travel at very low group velocities at specific optical frequencies. In photonic crystal waveguides, such low group velocities are also possible. We have studied the propagation of femtosecond pulses in these waveguides, with a phase-sensitive and time-resolved near-field microscope. With this microscope, we visualized the pulses...
We demonstrate three-dimensional imaging by wide field optical coherence tomography with high-speed CMOS camera. A sample volume of 2.3times2.3times1.1mm3 (corresponding to 256times256times300 pixels) was imaged at 10 volumes/s by the scanning reference mirror.
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