Optical network transmission
Coherent Optics: Synergistic for telecom, Data Center Interconnect (DCI) and inter-satellite Networks
by Kalar Rajendiran, Alphawave Semi (edited by Alan J Weissberger)
The telecommunications industry has experienced significant growth in recent years, driven by the increasing demand for high-speed internet and data services. This growth has created a surge in traffic on optical networks, leading to the development of new telecom network architectures that can support the increasing demand for bandwidth.
Optical networking technologies, such as coherent optics, have traditionally been developed for telecom applications. However, with the growth of hyperscale data centers and the increasing demand for high-speed networking, these technologies are now also being adopted in data center applications. Traditionally, data centers have used copper or short-range optical cables to connect servers and storage devices within the same data center. However, as data volumes continue to grow and data center interconnect (DCI) requirements increase, coherent optical networking is becoming an attractive option for data centers. With coherent optical networking, data centers can achieve higher data transmission rates over longer distances, resulting in increased data capacity and lower latency. 400G was the first data rate where hyperscale data center applications outpaced telecom applications in the use of coherent optics.
Coherent optics enables the transmission of high-speed data over long distances by using advanced signal processing techniques to mitigate the effects of signal distortion and noise. This technology is essential for supporting the growing demand for high-speed internet and data services, particularly in areas where traditional copper-based networks are not feasible. This trend is likely to continue and proliferate further going forward, driven by the ongoing growth of cloud computing, big data, AI/ML workloads and other data-intensive applications.
Another driver of the shift towards optical interconnects has been the increasing complexity of satellite networks. As satellite networks become more complex, the need for high-speed, low-latency communication between satellites becomes more important. Optical interconnects are ideal for this type of communication, as they offer very low latency and can support high-speed data transfer between satellites.
Optical telecom synergies have played a significant role in the evolution of inter-satellite communication. Many of the technologies and techniques used in optical telecom networks have been adapted for use in inter-satellite communication. Innovations in optical digital signal processing (DSP) and system automation also offer several optimization opportunities with inter-satellite interconnects. Benefits include:
- Improved Signal Quality: Optical DSP can be used to compensate for impairments in the optical signal, such as chromatic dispersion and polarization mode dispersion. This can improve the quality of the signal and reduce the bit error rate (BER), enabling high-quality communications over long distances.
- Reduced Latency: System automation can also be used to optimize the routing of data between satellites, minimizing the number of hops and reducing latency. This can improve the responsiveness of the system and enhance the user experience.
- Power-efficient Modulation Formats: Optical DSP can enable the use of power-efficient modulation formats, such as pulse-amplitude modulation (PAM), which can reduce the power consumption of the inter-satellite links while maintaining high data rates.
- Energy-efficient Signal Processing: Optical DSP can also be optimized to perform signal processing operations more energy-efficiently. For example, parallel processing and low-power digital signal processing techniques can reduce the power consumption of the signal processing circuitry.
At the recent Optical Fiber Communication (OFC) conference, Alphawave Semi (located in London, UK) showcased its ZeusCORE XLR test chip during the interoperability demonstration organized by the Optical Internetworking Forum (OIF). Alphawave Semi executives Loukas Paraschis, VP of Business Development and Tony Chan Carusone, CTO, presented on high-speed connectivity leadership. Their presentations touched on the growing synergies and optimization opportunities of inter-satellite interconnects and optical telecom through innovations in optical DSP and system automation.
As the volume of data traffic on optical networks continues to increase, it is essential to ensure that the cost of implementing and maintaining these networks remains affordable. This requires a delicate balance between increasing volume and decreasing costs, which can only be achieved through innovation and the development of highly-integrated co-designed solutions. These solutions combine multiple technologies and functions into a single device, reducing the complexity and cost of optical network infrastructure. This approach enables the development of more efficient, cost-effective optical networks that can meet the growing demand for bandwidth and high-speed data transmission.
To learn more about the ZeusCORE, visit the product page.
References:
Alphawave Semi at the Chiplet Summit
Alphawave IP is now Alphawave Semi for a very good reason!
Heavy Reading: Coherent Optics for 400G transport and 100G metro edge
Cable Labs: Interoperable 200-Gig coherent optics via Point-to-Point Coherent Optics (P2PCO) 2.0 specs
Adtran showcases coherent innovation at OFC 2023: FSP 3000 open line system & coherent 100ZR
Microchip and Cisco-Acacia Collaborate to Progress 400G Pluggable Coherent Optics
Cignal AI: Metro WDM forecast cut; IP-over-DWDM and Coherent Pluggables to impact market
NTT pins growth on IOWN (Innovative Optical and Wireless Network)
NTT Corp has unveiled a plan to invest JPY8 trillion ($59 billion) in growth businesses over the next five years. The core of its new growth will be its self-developed IOWN concept. The Japanese telecom giant is aiming to lift EBITDA (earnings before interest, taxes, depreciation and amortization) from JPY3.3 trillion ($24.3 billion) today to JPY4.0 trillion ($29.5 billion) in 2027.
The IOWN (Innovative Optical and Wireless Network) is an initiative for networks and information processing infrastructure including terminals that can provide high-speed, high-capacity communication utilizing innovative technology focused on optics, as well as tremendous computational resources. This is done in order to overcome the limitations of existing infrastructure with innovative technologies, optimize the individual with the whole based on all available information, and create a rich society that is tolerant of diversity. We have started R&D with the aim of finalizing specifications in 2024 and realizing the initiative in 2030.
IOWN consists of the following three major technical fields:
- APN: All-Photonics Network
Major improvement to information processing infrastructure potential - DTC: Digital Twin Computing
A new world of services and applications - CF: Cognitive Foundation®
Optimal harmonization of all ICT resources
A key concept is Photonic Disaggregated Computing – a new computing architecture that makes the shift from traditional server box-oriented computing infrastructure to boxless computing infrastructure, building on photonics-based data transmission paths.
By enabling each module, such as memory and AI computing devices, with photonic I / O (Input / Output) and connecting modules with a high-capacity and high-speed photonic data network, photonic disaggregated computing achieves highly flexible computing infrastructure. By dynamically combining modules according to computing demand, it also dramatically improves performance. Using NTT’s optoelectronic integration technology, the inter-package and inter-chip data transmission process can be replaced with photonics even inside of modules, while also dramatically improving energy efficiency.
By including data-centric computing technology and photonic disaggregated computing technology into the IOWN concept, we will accelerate creation of a natural cyber space in the era of the Smart World.
For example, AI control done by transmitting a large volume of data with low latency can realize system control that goes beyond the limits of human perception and reflexes. By coordinating a vast number of AI systems, NTT says they can realize overall optimization on the scale of society, as well as prediction of the future through large-scale simulations.
References:
https://group.ntt/en/ir/library/presentation/2022/230512e_2.pdf
Infinera trial for Telstra InfraCo’s intercity fiber project delivered 61.3 Tbps between Melbourne and Sydney, Australia
Infinera has completed a simulated intercity network trial for Telstra InfraCo’s intercity fiber project in Australia. The trial delivered 61.3 Tbps of unregenerated data transmission capacity on a fiber pair over the equivalent of 1,240 route km between Melbourne and Sydney, Australia. The network trial was implemented using Infinera’s 800G-capable ICE6 coherent solution [1.] and Corning Incorporated’s SMF-28® ULL fiber with advanced bend, demonstrating the high-performance capability of the express network, which is part of the intercity fiber network Telstra InfraCo is building across Australia.
Note 1. The sixth-generation Infinite Capacity Engine (ICE6), from Infinera’s Advanced Coherent Optical Engines and Subsystems, is a 1.6 Tb/s optical engine that delivers two independently programmable wavelengths at up to 800 Gb/s each. Utilizing a 7-nm CMOS process node DSP and advanced PIC technology, ICE6 leverages ultra-high baud rates, high modem SNR, and innovative features to break performance and spectral efficiency barriers, including 800G single-wavelength performance over 1000+ km in a commercial network. ICE6 is also beating optical transmission expectations at lower rates, including 600 Gb/s and 400 Gb/s per wavelength.
Image Credit: Infinera
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The trial was performed with real-world configurations, including 1,240 kilometers of ultra-low-loss fiber simulating one of Telstra InfraCo’s planned express Melbourne-Sydney routes. Infinera performed an in-service, non-traffic-impacting upgrade from C-band to combined C-band plus L-band as part of the capacity expansion process. With Infinera’s ICE6 and Corning’s optical fiber, Telstra InfraCo achieved 61.3 Tbps total capacity with 6.2 milliseconds latency across the combined C-band and L-band, with wavelengths up to 700 Gbps.
Telstra InfraCo’s express network is designed to be a high-performance national network for customers who need reliable, ultra-high bandwidth between capital cities and international submarine cable landing stations. For hyperscalers, global cloud providers, content companies, and governments, this means access to scalable high capacity and more direct routes, with optional route redundancy.
“Based on these results, Telstra InfraCo’s express network and overall intercity fiber build will lead the world in scale, low latency, and high data transmission performance rate,” said Kathryn Jones, Fiber Executive at Telstra InfraCo. “The simulation exceeds our expectations, offering almost seven times today’s typical capacity of 8.8 Tbps per fibre pair and validates our selection of Corning’s SMF-28 ULL fiber in the cable design. This will enable Telstra to develop market-leading solutions for our customers today and for years to come – a key element of Telstra’s ambitious T25 strategy and transformation goals.”
“To meet the rigorous demands of a vast network over Australia’s unique terrain, Telstra InfraCo needed fiber infrastructure with advanced bend capability and minimal signal loss to deliver ultra-high cable capacity. That’s why they turned to Corning,” said Sharon Bois, Division Vice President, Product Line and Marketing, Corning Optical Fiber and Cable. “Our SMF-28® ULL fiber with advanced bend is designed to meet exactly those needs.”
“Infinera’s 800G-capable ICE6 solution demonstrated industry-leading performance, maximizing fiber capacity and reach on Telstra InfraCo’s express network configuration,” said Nick Walden, Senior Vice President of Worldwide Sales at Infinera. “This achievement underscores the enhanced performance Infinera’s technology can bring to meet Telstra InfraCo’s express network requirements for bandwidth today and into the future.”
Media Contact:
Anna Vue
Tel. +1 (916) 595-8157
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Referencs:
Fiber Build-Out Boom Update: GTT & Ziply Fiber, Infinera in Louisiana, Bluebird Network in Illinois