We present a new flat-focal-field arrayed-waveguide-grating (AWG) design that utilizes an integrated field-flattening lens placed in the second star coupler. The effective-index difference between slab and lens region is obtained by adding a thin silicon nitride layer to a silicon oxynitride/silicon dioxide waveguide system. As a proof-of-concept, 81-channel AWGs, with and without the lens, are designed, fabricated, and characterized. The measurements show that the lens improves the adjacent crosstalk at the peripheral channels by 2 dB and introduces only 0.4 dB of extra excess loss. A more pronounced crosstalk- improvement for AWGs with higher number of output waveguides is predicted.
|Title of host publication||17th Annual Symposium of the IEEE Photonics Benelux Chapter|
|Place of Publication||Mons, Belgium|
|Publisher||Faculty of Engineering, University of Mons|
|Number of pages||4|
|Publication status||Published - 29 Nov 2012|
|Event||17th Annual Symposium of the IEEE Photonics Benelux Chapter 2012 - Mons, Belgium|
Duration: 29 Nov 2012 → 30 Nov 2012
Conference number: 17
|Conference||17th Annual Symposium of the IEEE Photonics Benelux Chapter 2012|
|Period||29/11/12 → 30/11/12|
- IOMS-PIT: PHOTONICS INTEGRATION TECHNOLOGY
Akça, B. I., Sengo, G., Pollnau, M., Driessen, A., Worhoff, K., & de Ridder, R. M. (2012). Flat-focal-field integrated spectrometer using a field- flattening lens. In 17th Annual Symposium of the IEEE Photonics Benelux Chapter (pp. 29-32). Mons, Belgium: Faculty of Engineering, University of Mons.