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 <[email protected]> wrote: > On 8/7/2018 15:46:03, "Baldur Norddahl" <[email protected]> > 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. > >
