Abstract

Ultracompact reflective arrayed waveguide gratings (RAWGs) employing a half horseshoe-shaped waveguide layout and distributed Bragg reflector mirrors in the array region are designed and fabricated. Two sets of RAWGs with 400 and 200 GHz channel spacing are experimentally demonstrated for TE and TM polarizations, respectively. Because of the high-index contrast between the silicon core and the oxide cladding, these RAWGs have very compact sizes. With the off-centered light input, we obtained the minimal on-chip losses of 7 and 9 dB and cross talks of $<-8$ and $<-5\mathrm{dB}$ for $9\times 400\mathrm{GHz}$ and $20\times 200\mathrm{GHz}$ RAWGs, respectively, for TE polarization. The measured minimal on-chip losses are 10 and 12.5 dB, and cross talks are $<-11$ and $<-7\mathrm{dB}$ for $8\times 400\mathrm{GHz}$ and $10\times 200\mathrm{GHz}$ RAWGs, respectively, for TM polarization. These RAWGs can find applications for on-chip spectroscopic sensing.

© 2016 Optical Society of America

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