Multiple-filter stopbands, with the potential to be nonuniformly spaced in frequency, are realized in a single integrated Bragg grating device on silicon. By utilizing a superposition of sidewall relief grating functions, N individual filter responses can be fabricated with a device length N× shorter than the equivalent serial set of gratings. Arbitrary combinations of eight-basis filter responses were demonstrated as selected by an eight-bit pseudorandom number generator, showing the flexibility of the complex Bragg grating device design.
- integrated optics devices
- Bragg reflectors
- wavelength filtering devices
Strain, M. J., Thoms, S., Macintyre, D. S., & Sorel, M. (2014). Multi-wavelength filters in silicon using superposition sidewall Bragg grating devices. Optics Letters, 39(2), 413-416. https://doi.org/10.1364/OL.39.000413