Much attention has been directed recently towards the need of national network operators to enhance the capacity of their long-haul networks in order to deliver data-heavy services, such as streaming high-definition video services to a large broadband subscriber base. A significant part of overcoming bottlenecks is the deployment of 100 Gb/s, and increasingly 200 Gb/s, transceivers employing coherent detection technology. However, it must not be overlooked that not every network operator is in exactly the same business.
Fibre Systems Autumn 2016
As befits its status as a computing giant, Microsoft’s musings about the internet’s future are poised to reshape the optical communication industry. In August 2015, following discussions with colleagues and suppliers, Brad Booth, principal engineer at Microsoft in Redmond, Washington, helped found the Consortium for On-Board Optics (COBO). The move answered a question: looking at network speeds of 400G and beyond, will networking equipment that uses faceplate pluggable optical modules continue to make sense?
We work in a young industry: in just 50 years, fibre capacity has increased astronomically. The theoretical has become practical with astonishing regularity. But for all the advance in speed there remains one weak link: contamination on fibre end faces. In the ‘good old days’ of megabits per second, a contaminated end face was not much of a concern. Today, insertion loss and reflectance problems are major concerns as speeds jump from gigabits-per-second to terabits and beyond.
The optical communications market is undergoing a seismic shift. This is driven in part by the emerging role of internet content providers who have established themselves not only as leading users of interconnect technology, but also as a disruptive force aggressively transitioning the market toward a fast-paced cloud, software-driven, and data centre-optimised design model. The widespread adoption of cloud-based services is leading to a tremendous increase in deployed capacity and a fast ramp-up of 100 Gigabit Ethernet, small form factor, short-reach interconnects.
The optical fibres that crisscross our globe are often described as having ‘infinite capacity’, but that’s not strictly correct. While optical fibres do represent an extremely efficient communications channel – a single optical fibre can carry more information than all of the wireless spectrum combined – their capacity is not truly unlimited.
In a fast-changing world where product development cycles are becoming compressed into months rather than years, a company whose chips can be programmed and reprogrammed on the fly would appear to have a natural advantage. Enter Xilinx, the San Jose, California-headquartered developer of FGPAs. The F in FPGA stands for field, as in field-programmable gate array, but it could so easily stand for fast, flexible or future-proof – all of which are qualities that these devices possess.
CableLabs is spearheading efforts to develop a proposal that uses coherent optics to dramatically boost the capacity of hybrid fibre coaxial networks, reports Andy Extance
Systems vendors are using intelligent software to squeeze more performance from optical networks. Pauline Rigby reports on developments at OFC 2017