Runge, P.P.RungeZhou, G.G.ZhouBeckerwerth, T.T.BeckerwerthGanzer, F.F.GanzerKeyvaninia, S.S.KeyvaniniaSeifert, S.S.SeifertEbert, W.W.EbertMutschall, S.S.MutschallSeeger, A.A.SeegerSchell, M.M.Schell2022-03-052022-03-052018https://publica.fraunhofer.de/handle/publica/25649810.1109/JSTQE.2017.27238442-s2.0-85022224848This paper presents a brief review of waveguide integrated balanced photodetectors for coherent receivers and describes some of their recent progresses. Waveguide integrated balanced photodetectors and balanced photodiodes (PD) monolithically integrated to InP-based coherent receiver photonic integrated circuits (PIC) are discussed. On one hand, the devices focus on high-end market for long-haul transmission, and on the other hand on short reach transmission for data centers. In this paper, also a balanced photodetector with the highest ever reported 3-dB bandwidth of 115 GHz is demonstrated. Moreover, a low-power concept for a homodyne receiver PIC with balanced avalanche PD is emphasized to introduce phase modulation formats to data center transmissions.en621537journal article