It’s not much of an issue on PON as far as I can tell. If you are running RFOG (analog cable added to the fiber) I think it’s a much bigger issue. I don’t know of very many companies still running RFOG.
Mark > On Aug 21, 2025, at 1:00 PM, Adam Moffett <[email protected]> wrote: > > I think the "tolerance to reflected power" was the wrong direction to look. > That seems like it's more about not damaging the equipment. I'll back out of > the rabbit hole and just ask what I'm trying to figure out: > > How much does reflectance actually hurt you on PON? Google results are > vague. > > Example: You generally need to have two connectors at the OLT (device to > patch panel), and there's one connector at the ONT. If you fusion spliced > everything else so there were no additional reflective events, would there be > a measurable BER or stability difference compared to having a coupler in the > NID, connectorized splitters in the field, etc. > > Another example: An AFL Fastconnect twist-on SC/APC field termination has > -50dB reflectance according to the spec sheet. A factory terminated > connector or splice-on connector is -65dB. How much does the twist-on hurt > you? > > > -Adam > > > From: Adam Moffett <[email protected]> > Sent: Thursday, August 21, 2025 11:54 AM > To: AnimalFarm Microwave Users Group <[email protected]> > Subject: Help me Grok this - tolerance to reflected power > > > Definition from ITU G.987: > 3.3.15 tolerance to reflected power (transmitter): A transmitter parameter > that characterizes the > maximum admissible ratio of the average reflected optical transmit power > incident at the transmitter > to the average optical transmit power. > > If my average transmit power is +6dBm and the tolerance to reflected power is > -15dB, then 6 - 15 = -9, so reflected power as strong as -9dBm won't harm the > transmitter? > Is it that easy or am I misunderstanding the definition? > > -Adam > > > > -- > AF mailing list > [email protected] > http://af.afmug.com/mailman/listinfo/af_af.afmug.com
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