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Proactive and nondisruptive channel probing is investigated for the measurement of channel power, amplifier channel gain, and optical signal-to-noise ratio (OSNR) without disrupting established wavelength-division multiplexed channels. Using a nondisruptive probe signal over a three-span link, wavelength switching-induced power excursions are predicted to be within ±0.2 dB, and OSNR as high as 20...
Fast switching of a dual laser PM-QPSK transceiver is used to mitigate channel-power excursions in amplified optical transmission under wavelength reconfiguration.
End-to-end, impairment-aware wavelength path provisioning is experimentally realized in a multi-domain network using a transparent software-defined exchange (tSDX) with real-time OSNR monitoring as an SLA guarantee for 100Gbps PM-QPSK DWDM transmission.
We demonstrate for the first time an SDN-based OFDM elastic optical network with pilot-tone assisted distributed control. Improvement in spectral efficiency and a fast reconfiguration time of 30ms have been achieved in our experiment.
We demonstrate the first software-defined dynamic resource allocation of OFDM subcarriers and modulation formats using the OpenFlow protocol and real-time DSP. Dynamic resource allocation for HD video and text is achieved for 20km SSMF transmission.
We demonstrate multipath routing and wavelength re-assignment in OpenFlow-enabled packet-circuit network, aware of links' bandwidth utilization, applications' protocol, and quality of transmission. Applications are re-routed under traffic congestion and wavelengths are re-assigned under physical impairments.
OpenFlow, as a unified operator-friendly manageable network control approach, has benefits of supporting the convergence of electronic packet and optical circuit networks as well as quality-of-transmission (QoT) awareness. We experimentally present the QoT-awareness in converged OpenFlow networks with (i) QoT-aware wavelength reassignment (ii) QoT-aware path re-routing if the QoT is below the requirement...
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