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We design multilayer photonic crystal cavities by depositing a polymer layer on top of a silicon photonic crystal slab. We demonstrate numerically that such cavities can have quality factors of Q~106.
The design of and demonstration results for a campus-scale wavelength routing network testbed are described. 4 K digital cinema contents are successfully transmitted over the testbed network via 8 lambda and GbE interfaces to verify the feasibility of the network.
We propose a novel monitoring technique targeting chromatic dispersion (CD) in a DQPSK system. A signed non-intrusive monitor can be realized by using asymmetric waverform distortion in a 43 Gbit/s DQPSK system without pilot tone.
We numerically investigate the lateral leakage losses of TM-like modes in silicon-on-insulator ridge waveguides and propose a novel ridge waveguide structure with low leakage losses over a wide wavelength range.
We report on the progress made towards achieving light guidance in long diamond waveguides (i.e. > mm) fabricated using a combination of photolithography, reactive ion etching (RIE), ion implantation and FIB techniques.
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.
All-optical tunable delay, dense wavelength conversion, and non return-to-zero (NRZ) to alternate-mark-inversion (AMI) format conversion are experimentally demonstrated using silicon microrings with a 450 times 250 nm cross-section size.
An all-optical differentiator making use of cross-gain modulation (XGM) in optical parametric amplifier (OPA) has been demonstrated. The experimental results of differentiating the periodic and pseudo-random signals are shown.
Buried-type benzocyclobutene optical waveguides fabricated by the illumination of ultraviolet laser shots are presented. Experimental results show multimode interference power splitters can be fabricated with high accuracy, short time, and good controllability.
All fiber variable attenuator was realized by applying torsional stress over a 2 times 2 fused tapered coupler. The spectral response and transmission was flexibly tuned to result in 40 dB dynamic range for 2 Watt laser at 1550 nm.
We investigate the dynamics of writing long-period gratings in unannealed and annealed boron-doped fiber samples with repeated scanning of CO2-laser pulses. Our results demonstrate clearly the effects of glass structure changes in the writing process.
Recent research on wide-band transmission over photonic crystal fiber (PCF) is described. PCF with endlessly single-mode (ESM) and unique chromatic dispersion characteristics is expected to be a key transmission medium in future optical networks.
A polymer-based gain waveguide structure, ldquoself-written active (SWA) waveguiderdquo, was invented. In the SWA waveguide, optical amplification and Fabry-Perot laser oscillation were demonstrated. The SWA waveguide devices will be considerable components for the integrated optoelectronics.
Bend sensitive wavelength filtering property in a concentric core solid photonic bandgap fibre is resented. The property is realised by not only the bandgap effect but mode coupling between the core mode and ring modes.
Using acoustic gratings, we experimentally determine the band structure of an all-solid photonic bandgap fibre and compare it to simulations. We show that the band structure is very sensitive to minute details of the structure.
A reconfigurable multi-passband optical filter of 0.5 nm linewidth and a tuning range of 8 nm is demonstrated using an opto-VLSI processor. The wavelength tunability is performed using digital phase holograms uploaded on the opto-VLSI processor.
We review progress in the area of InP large scale photonic integrated circuits (LS-PICs). We will review transmitter and receiver PICs for digital optical networking.
Holey fibers suitable for wide band transmission system were numerically studied. By taking the relation between the macro bending loss and the confinement loss into account, the usable transmission band have been clarified.
We report a design method of tapering structure for highly-efficient coupling between one-dimensional photonic-crystal coupled-cavity-waveguides and straight waveguides. Numerical results show that high transmission over wide bandwidth can be achieved by using proposed waveguide-tapering technique.
A new design of multi-core photonic crystal fiber (PCF) based 1times4 power splitter is demonstrated numerically. An equal power division in a ~6 mm long PCF device is confirmed through an accurate finite-element beam-propagation-method.
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