Beling, A.A.BelingBach, H.-G.H.-G.BachKunkel, R.R.KunkelMekonnen, G.G.G.G.MekonnenSchmidt, D.D.Schmidt2022-03-102022-03-102005https://publica.fraunhofer.de/handle/publica/34996010.1109/ICTON.2005.15058112-s2.0-33745711807The paper reviews the key characteristics of recent developments in the field of ultra fast photodetectors for 1.55 /spl mu/m wavelength. In detail, we report on a fully packaged highly efficient photodetector with 100 GHz bandwidth, suitable for 160 Gbit/s return-to-zero (RZ) detection. Furthermore, a monolithically integrated balanced photodetector is described, to be applied for direct detection of 80 Gbit/s differential phase shift keyed (DPSK) transmission formats. Achievements in the development of travelling wave photodetectors are summarized.en621conference paper