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Quasi-light Storage for Optical Data Packets
Published on: February 6, 2014
Experimental demonstration of a format-flexible single-carrier coherent receiver using data-aided digital signal
Robert Elschner1, Felix Frey, Christian Meuer
1Fraunhofer Institute for Telecommunications, Heinrich Hertz Institute, Department Photonic Networks and Systems, Einsteinufer 37, 10587 Berlin, Germany. robert.elschner@hhi.fraunhofer.de
Optics Express
|December 25, 2012
Summary
This study shows data-aided digital signal processing enables flexible coherent reception for various digital formats. Resource-efficient algorithms ensure stable performance in long-distance WDM transmission experiments.
Area of Science:
- Optical communications
- Digital signal processing
- Coherent detection
Background:
- Advanced modulation formats are crucial for increasing data rates in optical networks.
- Coherent detection systems require sophisticated digital signal processing (DSP) for signal recovery.
- Format flexibility in coherent receivers is challenging due to varying signal characteristics.
Purpose of the Study:
- To demonstrate a data-aided DSP approach for format-flexible coherent reception.
- To evaluate the performance of a single set of resource-efficient DSP algorithms across multiple modulation formats.
- To confirm stable operation in long-haul wavelength-division multiplexing (WDM) transmission.
Main Methods:
- Experimental WDM transmission of 28-GBd polarization-division multiplexing (PDM) and 4-dimensional (4D) modulated signals.
- Implementation of data-aided DSP algorithms for equalization.
- Testing across single-mode fiber (SSMF) links up to 7680 km.
Main Results:
- Successful format-flexible coherent reception of different PDM and 4D signals was achieved.
- The same resource-efficient DSP algorithms effectively equalized all tested formats.
- Stable and regular performance was confirmed, even in the nonlinear transmission regime.
Conclusions:
- Data-aided DSP offers a viable solution for format-flexible coherent receivers.
- Resource-efficient DSP algorithms can support diverse modulation formats in long-haul WDM systems.
- The proposed method ensures robust performance under challenging transmission conditions.
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