Fully tunable and switchable coupler for photonic routing in quantum detection and modulation.

@article{varc2019FullyTA,
  title={Fully tunable and switchable coupler for photonic routing in quantum detection and modulation.},
  author={Vojtěch {\vS}varc and Martina Nov{\'a}kov{\'a} and Glib Mazin and Miroslav Je{\vz}ek},
  journal={Optics letters},
  year={2019},
  volume={44 23},
  pages={
          5844-5847
        }
}
Photonic routing is a key building block of many optical applications challenging its development. We report a $2\times 2$2×2 photonic coupler with a splitting ratio switchable by a low-voltage electronic signal with 10 GHz bandwidth and tens of nanoseconds latency. The coupler can operate at any splitting ratio ranging from 0:100 to 100:0 with the extinction ratio of 26 dB in optical bandwidth of 1.3 THz. We show sub-nanosecond switching between arbitrary coupling regimes including a balanced… 

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