160 Gbit/s RZ–DPSK OTDM–Transmission over 480 km using 160 km Repeater Spans
Conference: Photonische Netze - 8. ITG-Fachtagung
05/07/2007 - 05/08/2007 at Leipzig, Germany
Proceedings: Photonische Netze
Pages: 5Language: englishTyp: PDFPersonal VDE Members are entitled to a 10% discount on this title
Schubert, Colja; Ludwig, Reinhold; Schmidt-Langhorst, Carsten (Fraunhofer Institute for Telecommunication, Heinrich-Hertz-Institut, Einsteinufer 37, 10587 Berlin)
Weisser, Stefan; Raddatz, Lutz (Alcatel-Lucent, Thurn–und Taxis Straße 10, 90411 Nürnberg)
We report on transmission experiments with a data rate of 160 Gbit/s and a transmission distance of 480 km using 160 km repeater spans without Raman amplification. The modulation format is return-to-zero differential phase-shift keying (RZ-DPSK). The high data rate of 160 Gbit/s is generated using optical time division multiplexing (OTDM) without polarization multiplexing. To enable the long repeater distances of 160 km between the amplifiers we use advanced forward error correction (FEC) algorithms. The total data rate in the experiments is 172 Gbit/s (160 Gbit/s + FEC). In contrast to the transmission experiments reported at this data rate so far, where the use of forward error correction was emulated by just considering the increased data rate, in our experiments real FEC hardware is used. The transmission system comprises a commercially available 43 Gbit/s transponder (transmitter + receiver), fully equipped with DPSK pre-coder, FEC coder and decoder, DPSK demodulator, balanced DPSK detector and the required control circuits to monitor the system parameters. The transmission line comprises 3 dispersion managed fiber (DMF) spans, a combination of super-large area (SLA) and inverse dispersion fiber (IDF) with a length of 160 km per span. The loss of 36 dB per span is compensated by erbium-doped fiber amplifiers (EDFA) only. The 160 Gbit/s OTDM receiver comprises demultiplexer and clock recovery based on electro-absorption modulators.