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An asymmetric twin waveguide eight-channel polarization-independent arrayed waveguide grating with an integrated photodiode array

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4 Author(s)
Tong, W. ; Dept. of Electr. Eng., Princeton Univ., NJ, USA ; Menon, V.M. ; Fengnian Xia ; Forrest, S.R.

We demonstrate the regrowth-free integration of an InP-based arrayed waveguide grating (AWG) with a 1 × 8 In0.53Ga0.47As p-i-n photodiode array. Low-loss polarization-independent adiabatic tapers transfer light from a passive waveguide optimized for external fiber coupling into a higher index waveguide for absorption in the In0.53Ga0.47As layer. The AWG and individual photodiodes have an external responsivity of 0.46 A/W and a polarization-dependent loss of ≤0.76 dB. The integrated device shows a worst-case crosstalk of -12.9 dB and a best-case crosstalk of -16.2 dB between channels, 9-dB total loss (including coupling losses), and -1.5-dB channel nonuniformity. The photodiode 3-dB electrical bandwidth is (25 ± 5) GHz.

Published in:

Photonics Technology Letters, IEEE  (Volume:16 ,  Issue: 4 )