Dual-etch apodised grating couplers for efficient fibre-chip coupling near 1310 nm wavelength

Xia Chen, David J. Thomson, Lee Crudginton, Ali Z. Khokhar, and Graham T. Reed

Index: 10.1364/OE.25.017864

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Abstract

We present our recent work on fibre-chip grating couplers operating around 1310 nm. For the first time, we demonstrate the combination of dual-etch and apodization design approaches which may achieve a coupling efficiency of 85% (−0.7 dB). Subwavelength structures were employed to modify the coupling strength of the grating. −1.9 dB efficiency was measured from a first set of fabricated structures.