Good news about almost all optics, their Rx window is pretty wide. Meaning a 1550nm optic will activate the receiver on a 1560nm optic just fine (and probably anything in the 1500nm band). Careful use of specialized single strand DWDM muxes (FS.com) can yield great bidi-like results with increased channel count.
-Ben > On Aug 13, 2018, at 10:49 AM, Eric Kuhnke <eric.kuh...@gmail.com> wrote: > > Something that is broadly the same as a coherent 100G QPSK single wavelength > optical module, but in two different frequencies, and a passive CWDM > mux/demux prism at each end might work. The limitation would be availability > of optics for a modern 100G MSA that are both coherent and Tx/Rx at two > different THz frequencies. > > Or with some box and vendor equipment in between, such as: > > http://cdn.extranet.coriant.com/resources/Application-Notes/AN_Groove_Bidirectional_Fiber_74C0169.pdf?mtime=20180206023321 > >> On Tue, Aug 7, 2018 at 1:00 PM Daniel Corbe <dco...@hammerfiber.com> wrote: >> On 8/7/2018 15:46:03, "Baldur Norddahl" <baldur.nordd...@gmail.com> >> wrote: >> >> >Hello >> > >> >There is a lack of bidirectional one fiber (BIDI) options for 40G and >> >100G optics. Usually BIDI is implemented using two CWDM wavelengths, >> >one for tx and one for rx. However there is also a lack of CWDM and >> >DWDM options for 40G and 100G. >> > >> >Would it be possible to use an optical circulator like this one >> >(customized to 1310 nm)? >> > >> >https://www.fs.com/de/en/products/33364.html >> > >> >Combined with a traditional two fiber 1310 nm 10 km 40G QSFP module >> >like this: https://www.fs.com/de/en/products/24422.html >> > >> >The link distance would be 5 km. >> > >> >The optical circulator separates tx and rx by the direction the light >> >travels in. It would work even though both directions use the same >> >wavelength. There will likely be some reflection but hopefully >> >attenuated enough that it is regarded as background noise. >> > >> >Has anyone done this? Any reason it would not work? >> > >> >Regards, >> > >> >Baldur >> > >> >> The main issue you're going to run into (especially trying to plug >> anything into a DWDM shelf) is 40G and 100G transceivers usually emit 4 >> lanes of traffic instead of a single lane like 10 and 1G optics do. >> >> I'd imagine that's why there are so few solutions that don't involve >> things like OTN. >>
