Her Majesty the Queen in Right of Canada As Represented by the Minister of Industry Through the Communications Research Centre Canada

Haimin Ding

Stephen J Mihailov

Ping Lu

Dan Grobnic

Robert Walker

Christopher W Smelser

Xiaoli Dai

Gino Cuglietta

A method of producing a thermally stable grating allows the grating to be placed in environments where temperatures reach 1000&#xb0; C. and where the grating is relatively stable and has very low loss from scatter. These gratings have spectral characteristics that allow them to be concatenated so as to form a sensor array. The method requires a step of lowering the characteristic intensity threshold of a waveguide by at least 25%, followed by irradiating the waveguide with femtosecond pulses of light having a sufficient intensity and for a sufficient duration to write the grating so that at least 60% of the grating remains after exposures of at least 10 hours at a temperature of at least 1000&#xb0; C. Pre-writing a Type I grating before writing a minimal damage Type II grating lowers the characteristic threshold of the waveguide so that a stable low damage type II grating can be written; alternatively providing a hydrogen or deuterium loaded waveguide before writing the grating lowers the characteristic threshold of the waveguide.

High temperature stable fiber grating sensor and method for producing same

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Nepean, Canada

Haimin Ding