Scientists at the University of Sydney have developed a chip-based information recovery technique that eliminates the need for a separate laser-based local oscillator and complex digital signal processing system for local and access networks.

Previously, these systems have unpacked the photonic, or optical, information and transferred it into the electronic information that computers can process, resulting in slower network speeds.

"Our technique uses the interaction of photons and acoustic waves to enable an increase in signal capacity and therefore speed," said Dr Elias Giacoumidis, joint lead author of a new study. "This allows for the successful extraction and regeneration of the signal for electronic processing at very-high speed."

The incoming photonic signal is processed in a filter on a chip made from a glass known as chalcogenide. This material has acoustic properties that allows a photonic pulse to 'capture' the incoming information and transport it on the chip to be processed into electronic information.

"This will increase processing speed by microseconds, reducing latency or what is referred to as 'lag' in the gaming community," said Dr Amol Choudhary from the University of Sydney Nano Institute and School of Physics. "While this doesn't sound a lot, it will make a huge difference in high-speed services, such as the financial sector and emerging e-health applications."

The photonic-acoustic interaction harnesses what is known as stimulated Brillouin scattering, an effect used by the Sydney team to develop photonic chips for information processing.

"Our demonstration device using stimulated Brillouin scattering has produced a record-breaking narrowband of about 265 megahertz bandwidth for carrier signal extraction and regeneration. This narrow bandwidth increases the overall spectral efficiency and therefore overall capacity of the system," Dr Choudhary said.

Group research leader and Director of Sydney Nano, Professor Ben Eggleton, added, "The fact that this system is lower in complexity and includes extraction speedup means it has huge potential benefit in a wide range of local and access systems such as metropolitan 5G networks, financial trading, cloud computing and the Internet-of-Things."

Dr Choudhary said the research team's next steps will be to construct prototype receiver chips for further testing.