Current Trends towards PON systems at 50+ Gbps

Next generation PON targeting 50 Gbit/s/lambda (50G-PON) based on intensity modulation and direct detection (IM-DD) will likely be under strong bandwidth limitations. We present a PAM-2 and Electrical DuoBinary performance analysis of 50 Gbps PON system by using 25G and 50G transceivers technology with several optical receiver architectures and study of the adaptive equalization impact

Photonic Provisioning Using a Packaged SOI Hybrid All-Optical Wavelength Converter in a Meshed Optical Network Testbed

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Optical terabit transmitter and receiver based on passive polymer and InP technology for high-speed optical connectivity between datacenters

We demonstrate the hybrid integration of a multi-format tunable transmitter and a coherent optical receiver based on optical polymers and InP electronics and photonics for next generation metro and core optical networks. The transmitter comprises an array of two InP Mach-Zehnder modulators (MZMs) with 42 GHz bandwidth and two passive PolyBoards at the back- and front-end of the device. The back-end PolyBoard integrates an InP gain chip, a Bragg grating and a phase section on the polymer substrate capable of 22 nm wavelength tunability inside the C-band and optical waveguides that guide the light to the inputs of the two InP MZMs. The front-end PolyBoard provides the optical waveguides for combing the In-phase and Quadrature-phase modulated signals via an integrated thermo-optic phase shifter for applying the pi/2 phase-shift at the lower arm and a 3-dB optical coupler at the output. Two InP-double heterojunction bipolar transistor (InP-DHBT) 3-bit power digital-to-analog converters (DACs) are hybridly integrated at either side of the MZM array chip in order to drive the IQ transmitter with QPSK, 16-QAM and 64-QAM encoded signals. The coherent receiver is based on the other side on a PolyBoard, which integrates an InP gain chip and a monolithic Bragg grating for the formation of the local oscillator laser, and a monolithic 90° optical hybrid. This PolyBoard is further integrated with a 4-fold InP photodiode array chip with more than 80 GHz bandwidth and two high-speed InP-DHBT transimpedance amplifiers (TIAs) with automatic gain control. The transmitter and the receiver have been experimentally evaluated at 25Gbaud over 100 km for mQAM modulation showing bit-error-rate (BER) performance performance below FEC limit

Experimental demonstration of a 400 Gb/s full coherent transmission in an in-field metro-access scenario

The current challenge for the physical layer of next generation optical access network based on PON architectures is to increase the capacity above 100 Gbps per wavelength. This target may require a revolution for PON, moving from direct detection (DD) to optical advanced modulation formats and coherent detection. In fact, the performances of full-coherent systems for ultra-high bit rates are, in terms of receiver sensitivity, significantly better than standard DD receivers, obtaining power budget of more than 30 dB. In this scenario of large available power budget, it will even be possible to envision a convergence of the access with the metro segment, also considering that wavelength routing functionalities based on Reconfigurable Optical Add Drop Multiplexers (ROADM) can be inserted at the boundary between the two network domains. In this future possible scenario, it becomes thus fundamental to study the resulting power budget for both the metro and the access network, in order to optimize the overall optical performance. To this end, we show in this paper experimental results obtained on a 33-km deployed metropolitan fiber link on a PM-16QAM full-coherent transmission at 50 Gbaud (400 Gbps) in terms of BER curves as a function of received optical power in a practical emulation of downstream metro+access transmission. A Reconfigurable Optical Add-Drop Multiplexer is introduced in the middle of the link to implement a wavelength routed metroaccess scenario

Top Challenges in 5G Densification

Part 1: 6th Workshop on “5G – Putting Intelligence to the Network Edge” (5G-PINE 2021)International audienceThe current report attempts to explore the top challenges that the MNOs need to overcome during 5G deployment in highly dense populated areas. Indicatively, the MNOs are warned about site acquisition challenges and electrification/energy related needs for a huge number of sites that shall be installed discretely at street level, the demand for rigorous testing and measurements to ensure full network coverage and always-on operation so that even mission critical applications (such as automotive and e-health apps) are enabled, accompanied by associated cost factors. Provided that at the time of writing (beg/2021) little is the worldwide experience from operating 5G networks, potential actions are suggested towards a smooth and efficient short time-to-market 5G deployment. In addition, indicative 5G densification related figures (e.g. amount of h/w nodes and distances among them), are calculated based on a specific FiWi PtMP network solution aiming at supporting the ultra-broadband 5G NR fronthaul bandwidth, while alleviating the need to install fiber terminations at every Base Station site

Next generation optical nodes: The vision of the European research project IDEALIST

As traffic demands become more uncertain and newer services continuously arise, novel network elements are needed to provide more flexibility, scalability, resilience and adaptability to today's optical networks. Considering these requirements, within the European project IDEALIST the investigation of elastic optical networks is undertaken with special focus on next generation optical node architectures. As an evolution of existent ROADMs and OXCs, these optical nodes will establish a new paradigm in which the network requirements will be efficiently addressed considering various emerging dimensions. In this article, we describe the drivers, architectures, and technologies that will enable these novel optical nodes. In addition, multivendor traffic interoperability, optical defragmentation, and node cascadability are also described as considerations in the node design

Next generation sliceable bandwidth variable transponders

This article reports the work on next generation transponders for optical networks carried out within the last few years. A general architecture supporting super-channels (i.e., optical connections composed of several adjacent subcarriers) and sliceability (i.e., subcarriers grouped in a number of independent super-channels with different destinations) is presented. Several transponder implementations supporting different transmission techniques are considered, highlighting advantages, economics, and complexity. Discussions include electronics, optical components, integration, and programmability. Application use cases are reported

Single-carrier 400G 64QAM and 128QAM DWDM field trial transmission over metro legacy links

\u3cp\u3eWe report on the results of a field trial carried out on a Telecom Italia metro link, targeting short data center interconnect applications. The test-bed presented realistic transmission conditions, such as an average 0.3-dB/km attenuation and usage of legacy erbium-doped fiber amplifier (EDFA) only. We transmitted a net bit rate of 400 Gb/s on a single carrier with 64 quadrature amplitude modulation (QAM) and 128QAM over 156 km. Error-free transmission over 80 km for single carrier dense wavelength-division multiplexing (DWDM) 30 × 400 G 64QAM and 30 × 400 G 128QAM (one half of the C-band) is reported. The net spectral efficiency, for both schemes, is 7.11 b/s/Hz.\u3c/p\u3

The BOOM project: A new generation of photonic routing subsystems using hybrid integration on silicon-on-insulator waveguide boards

The European BOOM project aims at the realization of high-capacity photonic routers using the silicon material as the base for functional and cost-effective integration. Here we present the design, fabrication and testing of the first BOOMgeneration of hybrid integrated silicon photonic devices that implement key photonic routing functionalities. Ultra-fast all-optical wavelength converters and micro-ring resonator UDWDM label photodetectors are realized using either 4um SOI rib or SOI nanowire boards. For the realization of these devices, flip-chip compatible non-linear SOAs and evanescent PIN detectors have been designed and fabricated. These active components are integrated on the SOI boards using high precision flip-chip mounting and heterogeneous InP-to-silicon integration techniques. This type of scalable and cost-effective silicon-based component fabrication opens up the possibility for the realization of chip-scale, power efficient, Tb/s capacity photonic routers