Summer 2018 Optical Connections Magazine


Rang-Chen (Ryan) Yu , vice president of business development, GM of optoelectronic solutions at Oplink, a Molex Company and co-chair of 100G Lambda MSA. MOLEX

EFFICIENT 100G/400G OPTICAL TRANSCEIVER SOLUTIONS FOR HYPERSCALE DATA CENTRES According to business information provider IHS, a decade of continued high growth of global network data centre trac shows no sign of abating anytime in the foreseeable future. The phenomenal rise in the popularity of smartphones and other mobile devices, social media and apps, streaming video, augmented and virtual reality - garnering new users, more devices per user and rising data usage per device - account for a significant boost in data centre trac. By 2020, analysts predict there will be 200 billion internet connected devices globally. Recent evidence suggests that the maturing consumer electronics markets may be just the tip of the iceberg. Growth rates for data bandwidth in cloud computing and machine-to-machine deployments are outpacing consumer data trac and driving massive demand for high- capacity data centre infrastructure. DATA CENTRE AND OPTICAL INTERCONNECT GROWTH TRENDS Over the last decade, top internet web companies such as AWS, Microsoft, Google and Facebook have been busy deploying larger data centres to meet

computing capability for serving web companies’ own service (e.g., Google or Facebook), or for renting out to enterprise customers (e. g., Amazon AWS or Microsoft Azure). While there are many variations of schemes to interconnect computer servers, a typical 2018 hyperscale data centre networking connection is characterised by servers connected to a top-of-the- rack (ToR) switch within a few metres at 25 or 2x25 Gbps with DAC (Direct- Attached Copper) cable. ToR switches are then interconnected via a massive switching fabric, often called leaf-spine architecture, by a large number of 100 Gbps optical links. Depending on the size of these data centres, typical optical interconnect ranges can be covered to a maximum of 500 metres, but large data centres require distances of up to 2km. The current generation of 100G optical transceivers are based on 4 channels of optical transmitters and receivers with each running at 25 Gbps in parallel to achieve 100 Gbps aggregate. There are two types of 100G optical transceivers. For those users willing to deploy more fibre and get lower cost per transceiver, a PSM-4 (Parallel-Single Mode-4) type transceiver is suitable. For those users who wish to deploy less fibre, a CWDM- 4 (Coarse WDM-4) type transceiver is preferred. Both types of 100G optical transceivers are being deployed in high volume today.

customer demand, with some of them now containing over 100,000 computer servers per building. These hyperscale data centre providers leverage economies of scale by consolidating processing power in sprawling data centres near locations where real estate and energy supplies are abundant and less expensive. By 2020, nearly half of installed servers across all data centres will be housed in hyperscale data centres, according to Cisco. Those servers will represent 68% of processing power and 53% of total data centre trac. With more mission critical business applications and time-sensitive consumer applications powered by the cloud, more data centres are being deployed closer to population centres around the globe. Increasingly, web companies are building data centres with multiple buildings in close proximity and interconnected with massive bandwidth. Building data centres on separate power grids in higher populated areas can additionally lower latency and improve the consumer experience. The strategy can also overcome the risks and limitations of a larger data centre relying on a single power grid. Inside each hyperscale data centre building, there may be tens of thousands to hundreds of thousands of computer servers interconnected by tiers of Ethernet switches to form a collective


| ISSUE 13 | Q2 2018

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