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We demonstrate a single-tone electro-optical frequency shifter based on an X-cut, Y-propagating Zn-diffused lithium tantalate waveguide emulating a rotating half-wave plate achieving 10 dB reduction in power consumption compared to Z-propagating LiNbO3 counterparts.
This paper focuses on design challenges and solutions for realization of low-power high-speed electronics for optical interconnects. Design methodologies for high sensitivity receivers and optimized driver circuitries at the transmitter side are presented.
The use of multicore fibers (MCF) for sensing applications is discussed. In particular, we report on precision interferometric sensors based on strongly-coupled core MCF fusion spliced to conventional single mode fiber. To enhance the sensor performance, our MCF is designed to mode match a standard single mode optical fiber and to support specific supermodes which interfere in a predictable manner...
We present two SiP modulator architectures for PAM-4 signal generation. We demonstrate the transmission of 56 Gbaud PAM-4 over 1 km of SMF. An 84 Gbaud PAM-4 generation below KP4 FEC threshold is also achieved.
Two different sensitivity analysis methods are applied to the coupled ring resonator filter to assess how the fabrication processes variation of some geometrical parameters can influence the performance of the photonics devices.
Impairment-aware RSA requires extensive computations of physical layer non-linearities. We propose strategies that either avoid or minimize these extensive computations with minimal trade-offs on network blocking performance. The computational savings will help support the rolling out of future T-SDN services with fast connection set-up time.
A 1.25–2.5Gbps cost-effective transceiver based on DPSK directly phase modulated VCSEL and a heterodyne receiver with a VCSEL as LO is proposed. The proposed transmitter sensitivity is −43.5dBm for 1.25Gbps and −40.5dBm for 2.5Gbps.
We demonstrated delta-sigma digitization and 80-km coherent transmission of 20×192-MHz DOCSIS 3.1 channels via a low-cost single-wavelength DP-16QAM system. Modulation-error-ratio higher than 48 dB was achieved supporting 16384QAM on all 20 DOCSIS channels.
An architecture supporting the OAA loop is proposed. It consists on extending nodes and the domain controller with analytics capabilities for local and network-wide operation automation. The architecture is experimentally assessed through a use case.
A polarization-independent heterodyne DPSK receiver with simple architecture based on 3×3 coupler is proposed for cost-effective PON. Results show −49dBm sensitivity for BER=10−3 at 1.25Gbps, <1dB penalty for random polarization tests, and high tolerance to interfering power.
We propose a scheme to introduce real-time optical layer monitoring into optical network virtualization enabled by software defined networking. The optical layer factors that impact the virtualization are characterised and investigated using this scheme experimentally.
We propose a dynamically configurable optical impairment model for a physical layer abstraction enabling physical parameters learning in multi-vendor networks. We experimentally demonstrate quality of transmission prediction in mesh networks with 0.6 dB Q-factor accuracy.
We proposed a cost-efficient large-capacity WDM-SDM optical access network employing MCF and self-homodyne detection. 4 × 6 × 200-Gb/s PDM-16QAM-OFDM downstream transmission was realized over 37-km 7-core fiber with simplified DSP enabling use of low-cost 10MHz linewidth DFB lasers.
We experimentally demonstrate a monitoring scheme utilizing both intermediate node and receiver monitoring for network re-planning. Either modulation format switching or light-path re-routing is adopted for restoration. The recovered signal performs better compared with static planning.
We investigate a Bayesian approach for VN reconfiguration in elastic optical networks. The approach identifies traffic condition from simple observations and selects VN suitable to the condition. Results show a fast converge of VN reconfiguration.
150G 8QAM and 200G 16QAM signals, residing on a layer-2/3 modular switch card with integrated coherent optics, are sent over a fully-loaded, flexible-grid open line system with 104 co-propagating 37.5 GHz channels.
A complete, realistic integrated system is investigated, consisting of directly spliced 7-core MCF, cladding-pumped 7-core amplifiers, isolators, and couplers. The system is demonstrated in a 16QAM C-band WDM scenario over 720 km.
• There have been intense research activities on SDN technologies including SDM fibers, MC-, MM-amplifiers, DEMUXs/DEMUXs with record-breaking transmission demonstrations up to 2 Pbit/s. • 100 (20 dB) SDM gain, i.e. 10 Pbit/s per fiber will be a short-term goal in order for the new fibers to be considered for installation in the future systems although the far long term demand should be transporting...
Optimizing routing and regenerator planning in a carrier's inter-city ROADM network provides significant savings. We describe how regenerator site planning and regenerator pre-deployment can be optimized for an inter-city IP over optical network.
Subcarrier modulation is shown to provide a number of system benefits including complexity savings in dispersion compensation, Kerr nonlinearity mitigation and flexibility in spectral efficiency. Design considerations are discussed.
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