GO-LONG: Google’s new generation of optical access network architecture can come from behind
At the NGON conference in Nice, France, Cedric Lam, Google’s company, gave a report titled “Go-Long A New TWDM Super PON”. As one of the founders of Google Fiber, is now the Google access department engineering director, Cedric in the optical communications industry’s position plays a decisive role. LightCounting latest issue of the post reported specifically Google’s new idea.
According to LightCounting, unlike Google-T NG-PON2 and IEEE’s NG-EPON standard, Google’s Go-Long has at least two different points. First, the original 20 km GPON / EPON standard extends to 50 km. Second, allow 10G, 40G, or 100G point-to-point business to be added to the same pair of fibers. Google believes that these features help to further reduce the network operating costs and investment costs. First, extending the transmission distance can reduce the number of central office COs that need to deploy the OLT 5 or 6 times, thereby significantly reducing equipment cost, space costs and power costs. At the same time, the use of WDM technology to integrate 12 PON into a pair of optical fiber not only greatly reduce the number of CO, the fiber will continue from the original 12 hours to 40 minutes, simplifying the cost of fiber and management costs.
However, GO-Long, like NG-PON2 and others, is also facing some difficulties in technology and applications. As demonstrated by Cedria, the implementation of the GO-Long architecture relies on a number of optical device technologies, including DWDM OLT burst mode transceiver modules, small EDFA with gain precedence, AWG for Cyclical, DWDM tunable laser for ONT. The last one is particularly challenging. Because the ONT can not achieve customer sharing, the cost is very critical. NG-PON2 also has this problem, but the challenge of GO-LONG is particularly difficult, because compared to NG-PON2 as long as 4 wavelength reuse, here to achieve 16 wavelengths of 100GHz wavelength multiplexing.
LightCounting pointed out that Google’s GO-Long fiber access architecture is very advanced. Amazon, Facebook, Microsoft these Internet giants did not show interest in the access network, and the traditional telecom manufacturers interest is only in the NG-PON2 and so on. However, taking into account the NG-PON2 and so is still in the early deployment, the practical application of a handful, Go-Long come from behind is not entirely impossible.
For Cedric, he founded the Google fiber directly to promote the FTTx deployment of operators around the world. Now in the 10G PON deployment of the confusion, GO-LONG can once again play the same role?