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The on-chip integration of all-optical random-access memories based on a photonic crystal nanocavity was achieved. Their ultralow power consumption, small footprint, and 40-Gb/s optical signal capability might be beneficial for future optical packet processing.
We have developed a new monolithic tunable laser for the deployment in a wavelength-routing switch. The new laser is based on two semiconductor ring resonators placed in parallel, where each resonator plays the role of a wavelength selective filter as well as a loop-mirror to form the necessary laser cavity, hence enhancing the Vernier tuning mechanism. By the control of a single electrode, the device...
A comprehensive R&D program aiming at all-optical RAM buffer subsystem for optical packet switching will be presented, featuring nano-cavity based optical bit memory, a unique beam addressing optics, and optical SP and PS converters.
We report a monolithically integrated 8×8 wavelength-routing switch with semiconductor-optical-amplifier-based wavelength converters and double-ring-resonator-coupled tunable lasers incorporated with highly reflective cavity mirrors. The dry-etched mirror coated with Au enables flexibility in device layout. It allows highly reflective mirrors in a chip and antireflective coating on both the input...
We demonstrate all-optical bistable memory operation with InGaAsP photonic crystal nanocavities based on refractive index modulation caused by carrier-induced nonlinearity. The minimum bias power for bistability is extremely low at 40 muW and the operating energy required for switching is only 30 fJ.
We prepare and experimentally demonstrate dynamic switching of 1times4 InGaAsP/InP multimode interference (MMI) waveguide switch. The rise and fall times of 1.9 ns and 1.4 ns, respectively, are obtained and good crosstalk and extinction ratio of -14.47 dB and 23.39 dB, respectively, are obtained.
Progresses of 5-year-long government-supported R&D program launched in 2007, aiming at all-optical RAM buffer will be presented. Focuses are on nano-structured optical bit memory for RAM, the optical interfaces such as serial/parallel converter and optical addressor as well as architecture design of optical packet switch with small-size buffers and the performance evaluation.
A high-speed wavelength-tunable optical filter is a key device for selecting different wavelength optical packets on a packet-by-packet basis in a photonic packet switching system. In this paper, we describe a high-speed tunable filter using apodized sampled gratings which can achieve the required filter characteristics at low cost. A sampled grating structure that exhibits a comb-like filter response...
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