[c-nsp] Optical amplification 1310nm

[Tim Rayner]

Hi Peter,

The Semiconductor Optical Amplifiers - "SOA"s can be designed to work around 1310nm. The nice thing is they should amplify all 4 lanes of an LR4 together. An SOA on the Receive side can be the difference between an LR4 optical module and an ER4 optical module. The ER4s are rated for 40km, though I'd imagine 50km would be achievable if you have good fibre, not too many patches and clean connectors.

My ideal product - which I've yet to see packaged this way - would be an in-line connector SOA - much like an attenuator - It would have a micro-usb connector on the side to power it, and possibly return some power level measurements over the USB interface if connected to an intelligent host. But alas, I have yet to see such a product! - maybe I'm dreaming! The modules are not yet that small - you can get them packaged in a 1RU rack mount! eg.
https://www.oequest.com/getproduct/18126/cat/0/page/1

If the gear you're looking to extend the range on has CFP interfaces, I'd seriously look at ER4 or ZR modules which are just becoming available. There are also DWDM coherent CFPs which have an 80km range without amplification. For example:
https://www.flexoptix.net/en/produkte/transceiver/cfp-coherent-tunable-dwdm-zr-transceiver-100-gigabit-sm-c-band-80km-22db-ddm-dom.html
Even if your Cisco device doesn't support this type of Optic, Flexoptix can allow you to program it so that it looks like a module Cisco do support!  These types of modules should be readily available within 6 months.

I've seen product announcements for up to 80km range even in a QSFP28 package, but no product yet eg:
https://www.inphi.com/media-center/press-room/press-releases-and-media-alerts/inphi-debuts-100g-dwdm-solution-for-80km-data-center-interconnects.php
This may need a dispersion compensation solution which the coherent ones will not.

I'm expecting a lot more product options in this space within the next 12 months.  I'll be interested to hear what solution you choose!

Regards

Tim.

Tim Rayner
Optical Engineer, AARNet Pty Ltd
street address: Building 9, Banks Street, YARRALUMLA ACT 2600
postal address: GPO Box 1559, CANBERRA ACT 2601
t. +61 2 6222 3575 f. +61 2 6222 3535 e. Tim.Rayner at aarnet.edu.au
w. www.aarnet.edu.au
Network Faults (24x7): 1300 APL NOC (1300 275 662) or noc at aarnet.edu.au

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________________________________________
From: cisco-nsp [cisco-nsp-bounces at puck.nether.net] on behalf of Peter Persson [webbax at webbax.se]
Sent: Monday, 8 August 2016 9:39 PM
To: cisco-nsp at puck.nether.net
Subject: [c-nsp] Optical amplification 1310nm

Hey,

We are looking for amplifying 40/100G connections for longer distances than
the 25km distance Cisco have on their products.

Do you guys have any suggestion of some alternative to EDFA/Amplification
that works on 1290->1330nm optics, that is not around 30k+ USD per lane?
The distance that is interested is up to 40-50km

Have a great day!

Peter
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