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A conventional colorless and directionless ROADM architecture is modified to achieve contention-free performance without relying on external transponders and OTN switches, and can achieve a smaller size and lower power consumption than those of a conventional CDC ROADM.
We demonstrate the first software-defined OpenFlow1.0-based flex-grid λ-flow architecture enabling 150Mb/s per-cell OFDMA MBH overlays onto bidirectional 10Gb/s PON, without any ONU-side optical filtering, amplification, or coherent detection over 20km SSMF and 1:64 passive split.
40.5 Tb/s over 1,822 km and 54.2 Tb/s over 634 km field SSMF was realized using 41 Nyquist rate DP-8QAM and DP-16QAM superchannels. They are the highest field capacities for long-haul and regional distances achieved so far.
We propose an efficient survivable FWDM network design algorithm for the first time. Survivable FWDM networks are efficient in terms of spectral utilization, power consumption, and cost compared to the conventional survivable fixed grid networks.
We introduce the network defragmentation problem for FWDM networks, formulate it, and propose heuristics. The network defragmentation process consolidates the available spectrum significantly while minimizing the number of interrupted connections.
We propose a method to optimize passbands for DWDM system upgrade using tunable asymmetric interleaver, and experimentally demonstrated the passband optimization and overall performance improvement on hybrid 40G and 100G DWDM system with various modulation formats.
We demonstrate 10×456-Gb/s single-carrier DP-16QAM transmission over 8×l00-km of ULAF at a channel spacing of 70 GHz (6.1 b/s/Hz), using coherent detection with an analog-to-digital converter whose bandwidth is only 5.3% above Nyquist sampling.
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