Hi Frank,

Frank wrote: Upon second look, these are "reconfigurable". Doesn't appear to be the same as tunable. =(

These tuneables have three features: 1. Tune 80-DWDM-channels in the 50 / 100 GHz grid -> You can change the wavelength of the SFP+ 2. Reconfigurable -> configure these SFP+ to operate in your used host system today. Reconfigure these SFP+ to operate in a different host tomorrow. 3. Combining 1. + 2. -> You can use these tunable SFP+ also in hosts which do not support wavelength tuning - in this scenario wavelength tuning is done externally via flexbox. The tunable SFP+ acts like a fixed DWDM SFP+ in your host (or even regular SFP+ ZR if there is no support for fixed DWDM SFP+) but the physics is still a full tunable DWDM SFP+

Jared wrote: They do exist. They tend to have tighter link budgets as compared to XFP tunable optics. Don't expect to go as far due to the receiver sensitivity.

One comment regarding the receiver sensitivity. For both (XFP and SFP+ tunable) it is -24dBm because for both formfactors the same APD receiver is used. Thanks Thomas

-----Original Message----- From: NANOG [mailto:nanog-bounces@nanog.org] On Behalf Of Frank Bulk Sent: Saturday, June 06, 2015 2:07 PM To: nanog@nanog.org Subject: RE: Tunable SFP

Thanks, that's very helpful. They have several models there: https://www.flexoptix.net/en/produkte/transceiver.html?fo_tra_formfactor=s fp #fo_tra_formfactor=sfp&fo_tra_interface=05_dwdm_100ghz&gan_data=true

Frank

-----Original Message----- Sent: Saturday, June 06, 2015 1:44 PM To: Frank Bulk Subject: Re: Tunable SFP

Check out https://www.flexoptix.net/en/

This topic came up last month and a lot of people recommended this vendor. Hope it helps.

On 6/6/2015 10:45 AM, Frank Bulk wrote:

...

Thanks -- can you point me to any suppliers?

Frank

-----Original Message----- From: Jared Mauch [mailto:jared@puck.nether.net] Sent: Saturday, June 06, 2015 12:41 PM To: Frank Bulk Cc: <nanog@nanog.org> Subject: Re: Tunable SFP

They do exist. They tend to have tighter link budgets as compared to XFP tunable optics. Don't expect to go as far due to the receiver sensitivity.

Jared Mauch

...

On Jun 6, 2015, at 1:29 PM, Frank Bulk <frnkblk@iname.com> wrote:

Anyone know if tunable SFPs exist? I've googled around on this, but only found fixed wave-length SFPs.

Or of a tunable SFP+ that can operate in SFP port as 1G?

Frank

I don't quite see why you would want to use a tuneable 1G optic now days. Generally people use coloured optics to either increase the capacity they can push down a Dark Fibre or to interconnect with a DWDM OTN. In days past using different wavelengths for traffic separation would be not unheard of but in today's world there are many better ways of doing that. The use of tuneable optics reduces sparing and complexity but it is a very difficult and expensive manufacturing task and I can understand why no manufacturer would bother with 1G as that seems like a very small market. If you really want 1G there are plenty of CWDM fixed optics available. If you need more capacity, well really 10G is not at all expensive now days. If you want traffic separation then use MPLS. If you have old 1G only switches, well, you know the answer to that. My 2c -----Original Message----- Hi, I believe nobody actually answered the original question: is there any tunable SFP module available. Notice the lack of a + in that statement. The datasheets for modules cited in this thread are all 10G modules with minimum speed of 8.5G. Nothing that will work at 1G.

Eric wrote:

Dwdm tunable 10G can run at 1G with rate select.

+1 already tested and deployed in the field. The configuration/programming of the tunable needs to be modified because pure 1G gear can not handle the 10G configuration of the tunable in most cases. For sure the mayor (economical) case for tunable SFP+ is 10G Ethernet but beside 1G ETH it also works for 4/8G FC datarate. Thomas

...

On Jun 7, 2015, at 2:15 PM, Tony Wicks <tony@wicks.co.nz> wrote:

I don't quite see why you would want to use a tuneable 1G optic now days. Generally people use coloured optics to either increase the capacity they can push down a Dark Fibre or to interconnect with a DWDM OTN. In days past using different wavelengths for traffic separation would be not unheard of but in today's world there are many better ways of doing that. The use of tuneable optics reduces sparing and complexity but it is a very difficult and expensive manufacturing task and I can understand why no manufacturer would bother with 1G as that seems like a very small market. If you really want 1G there are plenty of CWDM fixed optics available. If you need more capacity, well really 10G is not at all expensive now days. If you want traffic separation then use MPLS. If you have old 1G only switches, well, you know the answer to that.

My 2c

-----Original Message----- Hi,

I believe nobody actually answered the original question: is there any tunable SFP module available. Notice the lack of a + in that statement. The datasheets for modules cited in this thread are all 10G modules with minimum speed of 8.5G. Nothing that will work at 1G.