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160 Gbit/s OTDM long-haul transmission with long-term stability using RZ-DPSK modulation format

: Ferber, S.; Schmidt-Langhorst, C.; Ludwig, R.; Boerner, C.; Schubert, C.; Marembert, V.; Kroh, M.; Weber, H.-G.


IEICE Transactions. E, English transactions. B, Communications E88 (2005), Nr.5, S.1947-1954
ISSN: 0916-8516
ISSN: 1745-1345
Fraunhofer HHI ()

We describe a transmission system having a data rate of 160 Gbit/s based on the RZ-DPSK modulation format. The 160 Gbit/s single-polarization signal is generated by optical time division multiplexing technology using the base rate of 40 Gbit/s. The setup is explained and results are given with a special focus on the stability issue of the transmission system. The pulse source, the optical gate for demultiplexing, the clock recovery and the balanced photo-detector are based on semiconductor components. We present long-term bit error measurements (10 hours) over two different long-haul fiber links. The first link comprises 3 x 106 km standard single mode fiber and uses a PMD mitigation scheme. The other link consists of 4 dispersion managed 80 km fiber spans without the need for an additional PMD compensation. Using EDFA amplification solely and also no FEC, error-free operation was achieved over several hours, only limited by slow drift effects in the laboratory system.