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Ge on Si avalanche photodetectors

Research Area: Silicon photonics for telecom, datacom and interconnect

Main Researcher: Hongtao Chen

Avalanche photodetectors (APD) provide higher sensitivity than their classical PIN detector counterparts. This can have a major impact on the link budget in silicon photonics interconnects. Germanium detectors are readily integrated on the silicon photonics platform. In order for Germanium-based APDs to be readily integrated with CMOS electronics, low bias voltages are required. In this work Germanium avalanche photodetectors are studied with the aim of realizing low-voltage operation (-4V) and high sensitivity (-30dBm). We focus on conventional PIN structures due to their lower dark current compared to that of MSM structures. The baseline lateral PIN-based APD device is shown in Fig. 1(a), and TCAD simulation results for doping distribution and electric field distribution in Fig. 1(b).

Fig. 1. Germanium-based PIN APD
Fig. 1. Germanium-based PIN APD

Other people involved:

PhD thesises



    International Journals

  1. J. Verbist, J. Lambrecht, B. Moeneclaey, J. Van Campenhout, X. Yin, J. Bauwelinck, G. Roelkens, 40-Gb/s PAM-4 Transmission over 40 km using an O-band EML and a sub-5V Silicon Germanium APD , IEEE Photonics Technology Letters, p.2238-2241 doi:10.1109/LPT.2017.2757608 (2017).
  2. H. Chen, J. Verbist, P. Verheyen, P. De Heyn, G. Lepage, J. De Coster, P. Absil, X. Yin, J. Bauwelinck, J. Van Campenhout, G. Roelkens, high sensitivity 10Gb/s Si photonic receivers based on a low-voltage waveguide coupled Ge avalanche photodetector, Optics Express, 23(2), p.815-822 doi:10.1364/oe.23.000815 (2015)  Download this Publication (2.3MB).
      International Conferences

    1. H. Chen, J. Verbist, P. Verheyen, P. De Heyn, G. Lepage, J. De Coster, P. Absil, B. Moeneclaey, X. Yin, J. Bauwelinck, J. Van Campenhout, G. Roelkens, Sub-5V germanium waveguide avalanche photodiode based 25 Gb/s 1310 nm optical receiver, Asia Communications and Photonics Conference (ACP), Hong Kong, p.Am.1B.4 doi:10.1364/acpc.2015.am1b.4 (2015)  Download this Publication (754KB).
    2. Z. Wang, A. Malik, B. Tian, M. Muneeb, Clement Merckling, M. Pantouvaki, Yosuke Shimura, Roger Loo, J Van Campenhout, D. Van Thourhout, G. Roelkens, Near/Mid-Infrared Heterogeneous Si Photonics, The 9th International Conference On Silicon Epitaxy And Heterostructures (invited), (2015)  Download this Publication (3.5MB).

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