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High-speed balanced avalanche photodetector for homodyne detection

: Beckerwerth, T.; Ganzer, F.; Runge, P.; Schell, M.


Institute of Electrical and Electronics Engineers -IEEE-:
Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference, CLEO/Europe-EQEC 2019 : 23-27 June 2019, Munich, Germany
Piscataway, NJ: IEEE, 2019
ISBN: 978-1-7281-0469-0
ISBN: 978-1-7281-0470-6
Conference on Lasers and Electro-Optics Europe (CLEO Europe) <2019, Munich>
European Quantum Electronics Conference (EQEC) <2019, Munich>
Fraunhofer HHI ()

We present a balanced waveguide integrated avalanche photodiode (APD) for high-speed applications. Due to its high bandwidth up to 27 GHz (Fig. 1 a) and a responsivity of 0.6 A/W, this chip fulfils all requirements for coherent detection at symbol rates for 32 GBaud and beyond. Further, the internal gain and thus the high sensitivity of up to 9.6 A/W (Fig. 1) enable the detection of optical signals with low input power. This rises the idea for a homodyne detection scheme for differential QAM formats for avoiding the use of a local oscillator and therefore reducing the overall power consumption