Hi All,
Here’s a new thread for the dispersion considerations for 400G lanes.
If we want new CD fiber specs for 400G lanes, now is the right time to start those conversations.
For multimode CD specs we limit the range of wavelength and slope together. For example, the OM4 standard has a triangular region of compliant wavelengths and slopes that looks something like this:
For SM we might want to consider a trapezoid shape like this:
I think it would be easier for fiber manufacturers to comply with this shape with their existing product than narrowing the zero-dispersion wavelength range like Chris proposed earlier on the reflector. Snipping of the top “corners” of
the CD spec range could give the same reduction in max/min dispersion.
We could also take a page from IEC connector standards. For different connector grades IEC specifies random mate connector attenuation such that “probability of a random mated connector set of meeting or exceeding the specified level of
attenuation will be ≥ 97 %.” A new fiber standard could specify that >99% of a manufacturer’s fibers fall within the trapezoid.
Thanks.
- Earl
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