PublicaHier finden Sie wissenschaftliche Publikationen aus den Fraunhofer-Instituten.
Polarization Multiplexed 16QAM Transmission Employing Modified Digital Back-Propagation
|Optics Express 19 (2011), No.26, pp.B805-B810|
| Journal Article, Electronic Publication|
|Fraunhofer HHI ()|
We experimentally demonstrate performance enhancements enabled by weighted digital back propagation method for 28 Gbaud PM-16QAM transmission systems, over a 250 km ultra-large area fibre, using only one back-propagation step for the entire link, enabling up to 3 dB improvement in power tolerance with respect to linear compensation only. We observe that this is roughly the same improvement that can be obtained with the conventional, computationally heavy, non-weighted digital back propagation compensation with one step per span. As a further benchmark, we analyze performance improvement as a function of number of steps, and show that the performance improvement saturates at approximately 20 steps per span, at which a 5 dB improvement in power tolerance is obtained with respect to linear compensation only. Furthermore, we show that coarse-step self-phase modulation compensation is inefficient in wavelength division multiplexed transmission.