Info
Info
News Article

Optical Interconnects Propelled By InP Based VCSELs

Furukawa, OFS And Corning say they have increased reach and distance to benefit mega data centres
                                                                                                                                         

Furukawa Electric has developed a VCSEL that operates at 25 Gbps and realised transmission of up to 500 metres over prototype multimode fibres developed by OFS and Corning Incorporated.

"This is a significant accomplishment for data communications as both longer reaches and higher speeds are required for warehouse-scale data centres.  Our customers are raising expectations as they implement next-generation data centres and we are pleased to be innovating the technology to meet and exceed those expectations," says Haruki Ogoshi, senior fellow of Furukawa.

The rapid growth of cloud computing and expansion of 'big data' is causing a dramatic increase in the volume of data handled in data centres. This has generated demand for greater throughput in servers, switches and routers in data centres.  Increasing the serial speed of transmission of lasers and photo detectors is one approach to that end.

Also, there is a need to increase transmission distances between devices as data centres become larger. In mega data centres, for example, transmission distances of 300 m or longer can be required. At present, VCSELs at a wavelength of 850 nm are widely used for lowest cost optical interconnect.

 However, many say that when the transmission speed is changed from 10 Gbps to higher-speed 25 Gbps, the transmission distance is limited to less than  200 m due to the influence of chromatic dispersion in multimode fibres.

In order to solve these issues, Furukawa has developed a VCSEL with a wavelength of 1060 nm that operates at 25 Gbps.

"Increasing the VCSEL wavelength from 850 to 1060 nm reduces chromatic dispersion of fibres by approximately two thirds," says Durgesh Vaidya, Senior Manager Research and Development for OFS. 

"Accordingly, use of a multimode fibre with the modal dispersion minimized at 1060 nm reduces transmission impairments and allows transmission distances to be extended. It is widely expected that it will be easier to increase VCSEL speeds in the future beyond 25 Gbps by moving from 850 to higher wavelengths."

Furukawa created a prototype optical module integrating the newly developed 1060 nm VCSEL in a small package with a driver integrated circuit and then conducted a transmission experiment close to actual operating conditions. When a multimode fibre from OFS or Corning was used with the modal dispersion optimised for a wavelength of 1060 nm, a long-reach of 300 m was achieved.  

In a joint experiment, a short length of modal dispersion-compensating fibre developed by Corning was used in conjunction with standard OM4 multimode fibre, and a transmission distance of 500 m was achieved.

These results were obtained without the use of electrical compensation technologies such as a clock data recovery or an error correction. 

In this way, FEC's new VCSEL technology can allow for an increase in speed and distance without complicating future systems.

"This collaboration shows that long wavelength VCSEL technology can meet the demands of next generation data centres when combined with new, wavelength optimised fibre, or even standard OM4 fibre with new modal dispersion compensation fibre," says Alan F. Evans, research director, Optical Physics and Transmission Technology, Corning.

Details of this experiment will be presented at the Optical Fibre Communication Conference and Exposition to be held in San Francisco from March 9th to 13th at OFC/ NFOEC 2014, at Booth 4153.

 



AngelTech Live III: Join us on 12 April 2021!

AngelTech Live III will be broadcast on 12 April 2021, 10am BST, rebroadcast on 14 April (10am CTT) and 16 April (10am PST) and will feature online versions of the market-leading physical events: CS International and PIC International PLUS a brand new Silicon Semiconductor International Track!

Thanks to the great diversity of the semiconductor industry, we are always chasing new markets and developing a range of exciting technologies.

2021 is no different. Over the last few months interest in deep-UV LEDs has rocketed, due to its capability to disinfect and sanitise areas and combat Covid-19. We shall consider a roadmap for this device, along with technologies for boosting its output.

We shall also look at microLEDs, a display with many wonderful attributes, identifying processes for handling the mass transfer of tiny emitters that hold the key to commercialisation of this technology.

We shall also discuss electrification of transportation, underpinned by wide bandgap power electronics and supported by blue lasers that are ideal for processing copper.

Additional areas we will cover include the development of GaN ICs, to improve the reach of power electronics; the great strides that have been made with gallium oxide; and a look at new materials, such as cubic GaN and AlScN.

Having attracted 1500 delegates over the last 2 online summits, the 3rd event promises to be even bigger and better – with 3 interactive sessions over 1 day and will once again prove to be a key event across the semiconductor and photonic integrated circuits calendar.

So make sure you sign up today and discover the latest cutting edge developments across the compound semiconductor and integrated photonics value chain.

REGISTER FOR FREE

VIEW SESSIONS

Info
×
Search the news archive

To close this popup you can press escape or click the close icon.
×
Logo
×
Register - Step 1

You may choose to subscribe to the Compound Semiconductor Magazine, the Compound Semiconductor Newsletter, or both. You may also request additional information if required, before submitting your application.


Please subscribe me to:

 

You chose the industry type of "Other"

Please enter the industry that you work in:
Please enter the industry that you work in:
 
X
Info
X
Info
{taasPodcastNotification}
Live Event