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The ANFF is an open access network comprising of eight Nodes across 21 institutions with a portfolio of more than 500 tools valued at over $200 million.





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Hybrid Integrated Optics Chips


The node is also offering a non-ANFF subsidised service at ANFF assisted pricing rates (A$100/hr plus consumables costs) to produce full custom hybrid integrated optical waveguide circuits to users. In this context, a Hybrid device is one that incorporates a number of different materials in a single chip, each chosen for their excellence in one or more optical processing functions. Thus it offers a means to have passive, amplifying, optically nonlinear, etc functions on a single chip with the “best” material chosen for each function. Whilst a flip chip bonder is available and we have industry proven expertise and experience in bonding laser diodes to waveguides with very high alignment accuracy, we are not currently in a position to offer this unless you bring a supply of laser diode chips with alignment fiducials already etched into the top contact metal due to the costs involved in sourcing custom chips. We hope to be able to offer this service in the future using ANU grown lasers. As far as mixing materials on a chip goes, we achieve this via vertical tapering of the layers during deposition which provides very low intra-material coupling losses (<0.1 dB per junction when done properly – see images below). At present the materials choices are:


3% index contrast Germanosilicate

·        low loss and nonlinearity passive interconnects/components

·        UV Bragg gratings and UV post tuning

·        low coupling loss to UHNA fibre

·        Library of high performance fabrication tolerant couplers etc

·        Thermo-optic actives with polymer cladding


Polymer waveguides (SU-8 or Polysiloxane)

·        Low losses in the sub 1 micron band down to the blue

·        Fast and easy fabrication, direct maskless write later for SU-8


Tantalum Pentoxide

·        ultra-low loss single polarization waveguides

·        moderate nonlinearity


Tellurium dioxide (principally for rare earth doping)

·        gains exceeding 4 dB/cm at 1550nm with Erbium

·        potential for SBS and acousto-optic devices

·        moderate nonlinearity


Arsenic Trisulphide/Ge-As-Se

·        high nonlinearity glass for all optical processing

·        SBS based devices

·        All chalcogenide waveguide structures for MIR waveguide devices to 10+ microns operating wavelength


We are also working on technology to allow flip chip bonding in of other crystal media to enable fast electro-optic, magneto-optic, and other functions on chip. Ultimately this will represent all functions except detection and direct on chip light generation, though as noted this is only a matter of money for engineering costs. We hope that in years to come this service will be an officially recognized and subsidized part of our ANFF offerings. Please feel free to contact us to get more information and discuss requirements and pricing structures.    


Propagation loss for Germanosilicate 3% delta 3 x 3um waveguide with polymer overclad for thermo optic sections, note there is a loss tail at 1550nm and down to 800nm.




SU-8 3% delta 3x3um polymer waveguide transmission spectrum




Er Doped Tellurite waveguide showing low insertion/propagation loss with high doping (Coupling losses are ~2dB here)




Gain in 5cm long Er:TeO2 waveguide pumped at 980nm with lower doping than above




Vertical Taper concept




High nonlinearity waveguides with fibre mode matched polymer core output waveguides using vertical taper transitions. Total chip loss for 7cm waveguide ~3dB fibre connector to fibre connector.




Conceptual Hybrid integrated single chip mode locked laser




MIR Waveguide designs and propagation losses with Ge-As-Se core and Ge-As-S cladding. Loss slope from 3-5um is now established to be OH contamination in Sulphur glass and all selenide solution is being developed to eliminate this.




MIR coupler network for Astronomical nulling interference application




High Q MIR ring resonator for 5um operation as chemical sensor, Q ~200,000








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