Neil J. Baker

Ultrafast all-optical chalcogenide glass photonic circuits

Chalcogenide glasses offer large ultrafast third-order nonlinearities, combined with low two-photon absorption and absence of free carrier absorption in a photosensitivity medium. We review the key properties of these materials, including the strong photosensitivity and focus on several recent demonstrations of ultra-fast all-optical signal processing: optical time division multiplexing, all-optical signal regeneration and wavelength conversion.

High-performance Bragg gratings in chalcogenide rib waveguides written with a modified Sagnac interferometer

This work was produced with the assistance of the Australian Research Council (ARC). The Centre for Ultrahigh-bandwidth Devices for Optical Systems is an ARC Centre of Excellence. M. Shokooh-Saremi appreciates the partial support of the Iranian Ministry of Science, Research and Technology.

Sampled Bragg gratings in chalcogenide (As2S3) rib-waveguides

We have written a sampled Bragg grating into a highly photosensitive chalcogenide (As(2)S(3)) rib-waveguide using a scanning Sagnac interferometer. The grating exhibits evenly spaced rejection peaks over a 40 nm bandwidth. We estimate the induced refractive index change of the waveguide to be over 0.03 by matching the measured spectrum to numerical solutions of the coupled mode equations while accounting for an induced chirp. The sampled Bragg grating presented is comparable in strength and bandwidth to the best sampled Bragg gratings obtained to date in silica optical fibre.

Chalcogenide Glass Photonic Chips

This work was produced with the assistance of the Australian Research Council (ARC). CUDOS (the Centre for Ultrahigh-bandwidth Devices for Optical Systems) is an ARC Centre of Excellence. BLD and BE acknowledge the support of the Australian Research Council Federation Fellowship scheme.

Integrated shadow mask for sampled Bragg gratings in chalcogenide (As2S3) planar waveguides

We have developed a new approach for producing high performance sampled Bragg gratings in planar waveguides as a platform for WDM on-chip signal processing in a compact integrated device. Using this method we have successfully integrated a shadow mask directly onto a chalcogenide (As(2)S(3)) waveguide using standard semiconductor processing, eliminating misalignment errors between the mask and waveguide that otherwise occur. Through this integrated mask we demonstrate a very low duty cycle sampled Bragg grating with very narrow rejection peaks and spanning a very broad bandwidth.

Chalcogenide glass waveguides and grating devices for all-optical signal conditioning

Review of recent achievements in chalcogenide glass waveguide and fiber based all- optical signal processing devices utilizing both short and long period gratings as well as the inherent ultra-fast, ultra-strong, third-order nonlinearities.

Higher-order mode grating devices in As2S3 chalcogenide glass rib waveguides

This work was produced with the assistance of the Australian Research Council (ARC). The Centre for Ultrahigh-bandwidth Devices for Optical Systems (CUDOS) is an ARC Centre of Excellence.

Chalcogenide Glasses for All-optical Processing

Chalcogenide glasses, which contain S, Se or Te atoms combined with network forming elements such as Ge, As, Sb have the largest third order optical nonlinearity of any inorganic glass. As a result they are attractive candidates for fibre and waveguide devices for all-optical signal processing in the telecommunications bands. In this talk I will review our recent progress in all-optical devices such as regenerators, wavelength converters and other devices in chalcogenide glasses.

Modulation-instability and pulse-train generation in a highly nonlinear Bragg grating

The strong photosensitivity and nonlinearity of chalcogenide glass makes this material an ideal platform for Bragg soliton devices. We present the first nonlinear grating experiment in an integrated chalcogenide waveguide.

Modulation instability & Bragg soliton formation in a highly nonlinear As 2 S 3 waveguide Bragg grating

We observe modulational instability and pulse train generation in an integrated waveguide Bragg grating written in highly nonlinear chalcogenide glass. This Bragg soliton effect occurs at pulse energies 10,000 times lower than any previous reports.