Masthead Corporate Logo
Subscribe > e-Newsletter   > Magazines  
Search  Advanced

The Lightwave Blog

Bookmark This Page! (Ctrl+D)
Subscribe to an RSS Feed of this Blog.
<< Home

Posted by Stephen Hardy

As you'll see in an article that will appear in the November issue of Lightwave, the working group within SCTE that is shaping the RF over Glass (RFoG) standards has hit a stumbling block. The group has reached consensus on 1550 nm as the downstream wavelength. However, determining which upstream wavelengths to use has become an issue.

The problem is that the working group, which contains several equipment vendors that also make PON systems, is attempting to construct the specifications in such a way that carriers can overlay a PON over the RFoG infrastructure. Given the wavelengths already in play for GPON and EPON, plus those expected to be used for the 10-Gbit/sec standards now under development within FSAN and the IEEE, there aren't a lot of attractive wavelengths left. And if you can't leverage the volumes that lasers tuned to the already popular wavelengths enjoy, how can you keep costs down?

At the heart of the conundrum is the question of the role RFoG will play on the path toward all-optical MSO networks. One source for my article, whose company currently supplies RFoG-like equipment, asserts that the PON suppliers are pushing an agenda in which RFoG is merely an interim step toward PONs. The source disagrees with this philosophy; his feeling is that RFoG architectures will have a long life within MSO networks, and that the SCTE should therefore focus on what's the most cost-effective way to deploy them, PONs be damned.

Despite this hiccough, consensus indicates that the SCTE working group will complete its task by the middle of next year. But it would appear that carriers could play a very useful role by communicating their viewpoints on the expected relationship (or lack of it) between RFoG and PONs.

Labels: , ,

Blogger Bruce said...
1610 is the optimal wavelength to avoid 10GEPON and NGPON initiatives. As 1590 is a mainstay (CWDM) wavelength, those upstreams in place will always have laser supply.
Monday, November 3, 2008 2:33:00 PM EST  

<< Home

The Lightwave editorial staff uses The Lightwave Blog to share their thoughts on optical communications and whatever else might be the current topic of conversation from cubicle to cubicle. Feel free to add your own opinions.

Stephen Hardy is editorial director and associate publisher of Lightwave, which makes him responsible for the editorial aspects of the Lightwave franchise. A technology journalist since 1982, he once had his job duties described as "gets paid to tick off advertisers ".

Meghan Fuller is senior editor of Lightwave. She has degrees from Franklin & Marshall College in Lancaster, PA, and the University of Delaware and is a card-carrying member of Red Sox Nation.