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C -Band Optical 90 ^{\circ} Hybrids in Silicon Nanowaveguide Technology

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6 Author(s)
Voigt, K. ; Tech. Univ. Berlin, Berlin, Germany ; Zimmermann, L. ; Winzer, G. ; Hui Tian
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We present a fully passive silicon nanowire-based optical 90° hybrid based on a 4 × 4 multimode interference (MMI) coupler for application in coherent receivers. Simulations show 4×4 MMI coupler performance regarding excess loss, imbalance, bandwidth, and phase accuracy. The 4×4 MMI couplers show stable performance over C-band with excess loss and imbalance<; 0.5 dB and phase accuracy better than 5°. We obtain over C-band minimum extinction ratios of 20 dB.

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Photonics Technology Letters, IEEE  (Volume:23 ,  Issue: 23 )