Athermal arrayed waveguide gratings in silicon-on-insulator by overlaying a polymer cladding on narrowed arrayed waveguides |
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Authors: | Wang Linghua Bogaerts Wim Dumon Pieter Selvaraja Shankar Kumar Teng Jie Pathak Shibnath Han Xiuyou Wang Jinyan Jian Xigao Zhao Mingshan Baets Roel Morthier Geert |
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Affiliation: | Photonics Research Group (INTEC), Ghent University–IMEC, Sint-Pietersnieuwstraat 41, 9000 Gent, Belgium. Linghua.wang@intec.ugent.be |
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Abstract: | Athermal arrayed waveguide gratings (AWGs) in silicon-on-insulator (SOI) are experimentally demonstrated for the first time to our knowledge. By using narrowed arrayed waveguides, and then overlaying a polymer layer, the wavelength temperature dependence of the AWGs is successfully reduced to -1.5 pm/°C, which is more than 1 order of magnitude less than that of normal SOI AWGs. The athermal behavior of the AWGs is obtained with little degradation of their performance. For the central channel, the cross talk is less than -15 dB and the insertion loss is around 2.6 dB. Good characteristics can be maintained with temperatures up to 75 °C. The total size of the device is 350 μm × 250 μm. |
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