SFP+ works well over short distances.
SFP+ works well over short distances.
You're considering connecting two SFP+ modules with 20KM transceivers and a 5m duplex LC LC single mode cable. Will linking them cause damage to the diodes at the receiving end? The LRXP8510-X3ATL module is suitable for this setup.
I’m familiar with 850nm 300m multi-mode SFP+ transceivers available for around $16 each. I’m not sure how much the single-mode version would differ, but I think it probably won’t be significantly worse.
Consider your needs and the quality of your existing setup before deciding.
The optics described are multimode 300m models, while your setup includes 20km units. Burning out multimode optics isn't possible, but single-mode systems are more vulnerable at short ranges. You've successfully used 2km LR optics in close proximity for six months without problems.
According to others, the 20km measurement is a common point of discussion. The listed part number applies to MMF optics. If you already own the optics, replacing them with a MMF patch would likely be cost-effective.
You're doing great. Your setup has consistently performed well—over 1m of 10G, 40G, and 100G links, with transceivers that have been connected reliably for more than three years.