  A blazed chirped Bragg grating in a planar silica waveguide device was used
to create an integrated diffractive element for a spectrometer. The grating
diffracts light from a waveguide and creates a wavelength dependent focus in a
manner similar to a bulk diffraction grating spectrometer. An external imaging
system is used to analyse the light, later device iterations plan to integrate
detectors to make a fully integrated spectrometer. Devices were fabricated with
grating period chirp rates in excess of 100nm/mm, achieving a focal length of
5.5mm. Correction of coma aberrations resulted in a device with a footprint of
20mm x 10mm, a peak FWHM resolution of 1.8nm, a typical FWHM resolution of
2.6nm and operating with a 160nm bandwidth centered at 1550nm.
