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dwdm2
dwdm2
12/4/2012 | 10:28:00 PM
re: TeraXion Trots Out FBGs
Ampman writes: Those of you who snub FBG's are missing out on a technology that may just improve your DWDM and amplifier products. They are here to stay and there is a large market here.
-------------------

I'd like to learn a bit more about FBGs. How do they compare with AWGs for higher channel count application? That is how many channels can be cascaded in a single box? I presume they need to be cascaded like the TFFs. In addition, don't they need circulator or similar other device to work?

BTW, are you from AMP? Do they have any FBG program?

Thanks.
bigturtle
bigturtle
12/4/2012 | 10:28:00 PM
re: TeraXion Trots Out FBGs
Depends on price. TFF price has dropped to US$30/channel for 100 GHz system and depress US$10/channel system. TFF production is labor insentive. There are several operations in China. 50 GHz TFF has been proposed and close to become a reality.

For FBG to compete with TFF, they have to be mass produced automatically. None of existing player so far as I know is in this position.
lightfax
lightfax
12/4/2012 | 7:32:14 PM
re: TeraXion Trots Out FBGs
As it is a open secret in FBG business that couple of products like wavelength locker and DWDM filters have become commodity products. Dispersion compensators based on FBG is not very suitable at 40gig or at 10gig for that matter. I wonder as to why VC still pumping money in not so promising technology as it was touted to be. Am I missing something here?
uvlight
uvlight
12/4/2012 | 7:32:13 PM
re: TeraXion Trots Out FBGs
Lightfax,

Here's what you might be missing...

1. Low insertion loss
2. High coupling efficiency
3. Small footprint
4. Low error function
yeti
yeti
12/4/2012 | 7:32:12 PM
re: TeraXion Trots Out FBGs
You're missing a lot more!

The're is a new generation of FBG essentially without GDR (group-delay ripples) making them very likely candidates for dispersion compensators. Filters suitable for 10Gbs and 40Gbs have indeed been developed with very small dispersion within the useful bandwidth. A couple of companies are in a good position to supply such filters today.

I'd be careful, your comments are not up-to-date on the state of this technology. They are a real threat to thin film filters for high density networks and gain equalizers as well.

Cheers
yeti
yeti
12/4/2012 | 7:32:12 PM
re: TeraXion Trots Out FBGs
You're missing a lot more!

The're is a new generation of FBG essentially without GDR (group-delay ripples) making them very likely candidates for dispersion compensators. Filters suitable for 10Gbs and 40Gbs have indeed been developed with very small dispersion within the useful bandwidth. A couple of companies are in a good position to supply such filters today.

I'd be careful, your comments are not up-to-date on the state of this technology. They are a real threat to thin film filters for high density networks and gain equalizers as well.

Cheers
LightBeating
LightBeating
12/4/2012 | 7:32:11 PM
re: TeraXion Trots Out FBGs
Lightfax,

Totally agree. FBG's are a commodity. Teraxion, and Southampton Photonics for that matter, bring nothing new to this technology that wasn't there 5 years ago. But Canadian VC's are always late by a generation or two when it comes to technology...

LB
LobsterBoy
LobsterBoy
12/4/2012 | 7:32:11 PM
re: TeraXion Trots Out FBGs
Lightfax, it is an open secret that you have no clue what you are talking about. IGm sure VCs are well aware of the current market malaise and the risks inherent. If they are investing money in this technology maybe they are aware of something that you are not?

IGm sure your vast amount of personal experience with bragg grating products has helped you to form these well thought out conclusions of yours.

I for one wouldnGt be so quick to cast judgment on this technology.
yeti
yeti
12/4/2012 | 7:32:11 PM
re: TeraXion Trots Out FBGs
LightBeating!

Your comment very conspicuously demonstrate that your own understanding is 5 years old.

Come on - educate yourself!
yeti
yeti
12/4/2012 | 7:32:11 PM
re: TeraXion Trots Out FBGs
LightBeating!

Your comment very conspicuously demonstrate that your own understanding is 5 years old.

Come on - educate yourself!
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