ROADMAP 2020 PAVING THE WAY
Optics and DSP designed to reach maximum speeds of 800Gb/s, coherent pluggable technology, next generation transceivers, along with test and measurement equipment designed with the installer in mind, are just some of the things on the horizon for the next 12 months
Reducing the number of transceivers used in a network will be a consideration for 2020, with sub-carrier aggregation coming to the fore as a way of helping to redefine the cost structure of transport networks. Infinera kick-started this trend in 2019 with the launch of XR optics, a point-to-multipoint coherent optical sub-carrier aggregation technology optimised for hub-and- spoke traffic paterns. Where connections in optical transport
networks have historically been implemented using point-to-point technology, which require matching transceivers of identical speed on each end of the fibre link, XR optics is designed to break the associated limitations with this technology. Powered by independently routable Nyquist
sub-carriers and coherent optical aggregation capabilities, XR optics technology enables a single high-speed transceiver to simultaneously send and receive independent data streams to/ from numerous low-speed transceivers. By leveraging these capabilities, network
operators can reduce the number of transceivers in the network, and eliminate the need for intermediate aggregation devices. Te new technology is also designed to be integrated into a variety of form factors, including industry-standard pluggables, from low-speed interfaces with a single sub-carrier to high-speed (400G+) interfaces with numerous sub-carriers. Dave Welch, founder and chief innovation
officer at Infinera said: ‘We’re excited to introduce the revolutionary concept of coherent sub-carrier aggregation, one that will redefine the cost structure of next- generation transport networks. XR optics addresses a fundamental deficiency in optical communications technology and is expected to have a significant impact on any network that implements an aggregation function.’
www.infinera.com
‘Plug and play’ is a term most will recognise from the components arena, and this will start to make its way into the transceiver market. An early adopter was Finisar, which launched the Flextune wavelength self-tuning feature embedded in certain Finisar tunable DWDM optical transceivers. Flextune is designed to make it easy to
use DWDM, since it eliminates the need for technicians to track fibres or carry extra equipment to program the wavelength of each module during their deployment. In a patented feature by the company, modules are truly plug and play, since no host intervention is required. Up to 96 wavelength-tunable transceivers
in a DWDM network will automatically configure their wavelengths within ~5 minutes without any input from field technicians or the host network equipment. Only a single transceiver SKU is needed to support the full C-band (instead of 40 or 96) and the required inventory for sparing is significantly reduced. Te self-tuning capability is designed to
decrease operational expenses by reducing hours during deployment by reducing complexity and eliminating the need to track fibres. Te near-end transmiter (Tx) scans through available ITU wavelengths to find a matching Mux port. Once the near-end Tx wavelength matches the Mux port, the signal travels through the network to the far-end receiver (Rx). Te far-end transmiter then starts a special scan through the available ITU wavelengths. Once the transceivers have matched, a ‘handshake’ occurs, which locks the wavelengths of both transceivers.
www.finisar.com
A range of form factors allows customers
to choose the best option in meeting network architecture requirements for certain applications based on specific space, power and operational requirements. WL5e provides programmable capacity
Single-wavelength 800G technology started to make its way into the market in the past 12 months, and this will be an area of growth. Ciena revealed its range of WaveLogic technology products, which includes its 800G solution. Te new technology will be delivered in two solutions. WaveLogic 5 Extreme (WL5e) and WaveLogic 5 Nano (WL5n). In WL5e, Tunable bandwidth up to 800G provides what the company calls significant efficiency advantages over 600G solutions, allowing customers to take advantage of the pending introduction of 400G interfaces in the data centre.
20
in 50G increments over a single-wavelength 800G solution, which means, says Ciena, that it delivers 50 per cent more capacity per wavelength and up to 20 per cent higher spectral efficiency. It also enables an elegant evolution to emerging 400GbE-interface routers, with the ability to efficiently transport 400GbE client rates at any distance, from across the metro to across the ocean. WL5n addresses the market of footprint-
optimised coherent solutions for 100G-400G applications. It supports a range of solutions that meet specific space, power and operational requirements, from standalone pluggables for 400ZR single-span DCI applications, to extended-temperature, standards-based optical modules for access applications, to compact
Fibre Yearbook 2020
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