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Real-time experimental demonstration of DSP-enabled soft-ROADMs with multi-level flexible add/drop functions for
Optics Express
|January 16, 2019
Summary
This study demonstrates real-time soft-Reconfigurable Optical Add-Drop Multiplexers (soft-ROADMs) without optical filters or conversions. These flexible ROADMs enable dynamic network operations, supporting 5G slicing and Software-Defined Networking (SDN).
Area of Science:
- Optical Networking
- Digital Signal Processing
- Telecommunications
Background:
- Traditional Reconfigurable Optical Add-Drop Multiplexers (ROADMs) often require optical filters and optical-to-electrical-to-optical (O-E-O) conversions, limiting flexibility and increasing complexity.
- The need for programmable and transparent optical network nodes is growing, driven by demands for elastic 5G slicing and Software-Defined Networking (SDN).
Purpose of the Study:
- To experimentally demonstrate Digital Signal Processing (DSP)-enabled flexible ROADMs, termed soft-ROADMs, that operate in real-time.
- To explore the dynamic add and drop capabilities of soft-ROADMs at sub-wavelength and spectrally overlapped sub-band levels.
- To assess the performance robustness of soft-ROADMs under practical network condition variations.
Main Methods:
- Utilizing digital filtering, radio frequency (RF) signal-driven intensity modulation, and passive optical coupling.
- Implementing FPGA-based orthogonal digital filter multiplexing in a 4-channel Intensity Modulation Direct Detection (IMDD) optical network node.
- Conducting extensive real-time experimental explorations of add and drop operations.
Main Results:
- Soft-ROADMs were demonstrated to be free from optical filters and O-E-O conversions, offering inherent transparency.
- Optical power penalties were as low as 1.4dB for add and 2dB for drop operations.
- Add operations tolerated significant optical input dynamic ranges (6.5dB sub-wavelength, 1.5dB sub-band), and drop operations showed robustness against RF signal amplitude and phase variations.
Conclusions:
- The technical feasibility of soft-ROADMs for creating programmable networking environments has been significantly advanced.
- Soft-ROADMs offer a promising solution for elastic 5G slicing and the SDN paradigm.
- The demonstrated technology paves the way for more flexible and efficient optical network architectures.
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