Foo Cheong Yit

28-ps switching window with a selective area MOVPE all-optical MZI switch

The first dynamic all-optical switching of a bandgap-engineered Mach-Zehnder interferometer semiconductor optical amplifier all-optical switch was achieved. A 28-ps switching window was successfully confirmed. This is the first demonstration of a bandgap-engineered large-scale all-optical photonic integrated circuit with either selective-area-growth or quantum-well-intermixing techniques.

All-optical wavelength conversion with monolithically integrated Mach-Zehnder interferometer SOA switches by selective area MOVPE

We achieved first dynamic all-optical wavelength conversion in bandgap-engineered MZI SOA all-optical switch. Clear eye-diagram of 2.5Gbps wavelength conversion was confirmed. This is the first wavelength conversion demonstration with a bandgap-engineered PIC with either selective-area-growth and quantum-well-intermixing techniques.

Monolithically Integrated Mach-Zehnder Interferometer All-Optical Switches by Selective Area MOVPE

We achieved first dynamic all-optical signal processing with a bandgap-engineered MZI SOA all-optical switch. The wide-gap Selective Area Growth (SAG) technique was used to provide multi-bandgap materials with a single step epitaxy. The maximum photoluminescence (PL) peak shift obtained between the active region and the passive region was 192 nm. The static current switching with the fabricated switch indicated a large carrier induced refractive index change; up to 14 π phase shift was obtained with 60mA injection in the SOA. The carrier recovery time of the SOA for obtaining a phase shift of n was estimated to be 250-300 ps. A clear eye pattern was obtained in 2.5 Gbps all-optical wavelength conversion. This is the first all-optical wavelength conversion demonstration with a bandgap-engineered PIC with either selective area growth or quantum-well intermixing techniques.

Dynamic switching and wavelength conversion in a monolithically integrated Michelson-interferometric SOA all-optical switch by selective area MOVPE

We demonstrated first dynamic operation in first regrowth-free Michelson-interferometric SOA all-optical switch. 20 ps switching window and 10 Gbps wavelength conversion was achieved. This switch by selective-area-MOVPE is the first Michelson-interferometric type ever realised among all other bandgap-engineering approaches.

Monolithic MZI All-Optical Switch with Selective Area MOVPE

We demonstrate a bandgap-engineered dynamic monolithic MZI SOA all-optical switch with wide stripe selective area MOVPE. Compared with other simple laser-EAM integration with other bandgap engineering techniques, it is the largest working device ever achieved. All-optical wavelength conversion was achieved with single SOA all-optical modulation. In all-optical switching with differential phase technique, a 28 ps switching window was successfully demonstrated