Coupler tapered alignment
The tapered shaft coupling typically comprises two main parts: the hub and the tapered sleeve. They are also able to compensate for angular, parallel or skew shaft misalignment in a torsionally rigid way. Proper alignment will reduce bearing, shaft and failures, bearing and coupling temperature, vibration, and energy consumption. However, the huge mismatch between the mode sizes of a single mode fiber ($approx 10mu m$ in diameter) and a silicon wire waveguide (220 x 500 nm) can.
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