Abstract
We propose a new type of arrayed waveguide grating (AWG) device that operates as a Fourier transform (FT) spectrometer without the need of scanning elements. The large input aperture size typical of a FT spectrometer eliminates the requirement for a narrow single mode input waveguide while still achieving a high spectral resolution. By replacing a single mode input waveguide by a wide ridge or slab waveguide, the light gathering capability (etendue) is markedly increased. An example of the device with a resolution of 0.07 nm (/spl sim/10 GHz) and designed for the silicon-on-insulator (SOI) platform is presented. The spectra calculated from the simulated interferograms show no noticeable deterioration for aperture widths as large as 40 /spl mu/m, yielding more than 50 fold increase in aperture size compared to a conventional AWG or an echelle grating based device at the equivalent resolution.
Published Version
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