> On Aug 13, 2018, at 5:56 PM, Eric Kuhnke <eric.kuh...@gmail.com> wrote:
>
> For 1 and 10Gbps OOK modulation yes, but not for something like a ITU DWDM
> grid channelized or tunable coherent optic. In which the (QPSK, 8PSK, 16QAM)
> signal has a specific THz width and frequency not unlike a radio operating in
> a very, very narrow waveguide.
>
There are some DCO 100G coherent optics on the market, but I think this thread
is more about why there’s not much in the way of 40/100g transmission speed,
but it really is about how 10G was one of the last walls where OOK was a thing.
Once you went 40G/100G you went to parallel signals, either in CDWDM form or
parallel signals on parallel fibers (eg: those MPT/MPO cables we all get to
enjoy).
If you talk to the optics folks you can get customized tx/rx optics, and in
theory you could get an optimized 100G-LR4 or 100G-ER4-Lite optic, but even
those the reach is quite limited to around 25Km while in the 10G space you can
get up to 80-120km with a filter and a bunch of pluggable fixed channel (or
tunable) optics.
You can get decent 100G OEO solutions for a fair price per channel but you’re
still looking at $$ compared to just building a 40x10G system due to the cost
differences.
Without more details like your link budget, etc.. it’s hard to suggest options
other than get at least 2 fibers :-)
I know some vendors are working on some creative 1 fiber solutions due to the
way the dark fiber is taxed in Europe, so you should be talking to the usual
suspects..
- Jared
