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The cable we are using is a 2 fibers LC UPC Duplex to LC UPC Duplex OS2 (link : https://www.fs.com/fr/products/40384.html?attribute=103594&id=3704291)

I checked to make sure the cables are connected properly and not reversed.
There is only one way to connect them to the transceiver.

It's most probably the single mode fiber cable but from our understanding it only depends on the use of your communication.
But we are likely wrong if most of you ask this question.
If that is indeed the problem, what is the explanation?
What did we misunderstand about multi-mode and single-mode cables?

As soon as possible, I'll try using a multi-mode cable to run the test and post an update here.

What Mikrotik switch model is it and does the Mirotik switch also show the correct information about the transceiver?

The switch does show the correct information about the transceiver
The Mikrotik we have is a CRS354-48G-4S+2Q+ (link :https://mikrotik.com/product/crs354_48g_4splus2qplusrm)

Edit : Is it normal for the transceiver displayed on the Mikrotik switch to be the OPNsense transceiver (SFP-10GSR-85) even though the SFP+ module connected to the switch is actually the other one ?

I have read a lot about MikroTik products having issues with certain SFP/SFP+ modules in the past so the first thing I would look at is any recent Firmware Change Logs mentioning any kind of issues and see if they match your situation.

Fortunately, I can't find any logs that point in that direction

That good news if you use it and it works !!
So it must be another issue...

We use an OPNsense DEC3800 Series on version 26.1.2_5
I don't know if there are any significant differences in the use of SFP+ ?

Does the interface require any special configuration, or do I need to install additional drivers ?

Right now, I don't really have any idea why the status remains "no carrier" and I don't find logs that can help me with this.
If anyone has any clues, I'm all ears

You mention 1000base-SX - that would be 1G, not 10G. I don't quite understand the context of that sentence.

My mistake I had come up with a theory that turns out to be wrong.

[M]

Hello,
I have an issue regarding the compatibility of 10G SFP+ modules on my OPNsense router.

I'm trying to set up an SFP+ connection between an OPNsense and a Mikrotik switch.
After finding the right SFP+ module compatible with Mikrotik (which is this one: https://www.fs.com/fr/products/230693.html?attribute=71428&id=4912609)

So I started looking for an OPNsense-compatible SFP+ module.
According to the official OPNsense documentation, one of the recommendations for multi-mode 10G fiber is an FS SFP+ module, model SFP-10GSR-85 10G.
(link :https://docs.opnsense.org/hardware/sfp_compatibility.html )
Which is exactly what I'm looking for.

So I bought the SFP+ recommended by OPNsense (link : https://www.fs.com/fr/products/11589.html?attribute=111881&id=4370314).

However, after receiving the SFP+ and connecting the right SFP+ on both ends, there are no indicator lights, and the interface status shows "no carrier."
The router successfully detects the SFP+ as shown in the attached image.

Upon further investigation, I found that the interface lists the supported media; however, they differ from those listed in the documentation, as shown in the second attached image.
And so I may have found the right SFP+ module compatible with the OPNsense interface, which is 1000base-SX and is the following: SFP-10GMSR-85 and not SFP-10GSR-85.

How can I get the SFP+ module recommended by OPNsense (SFP-10GSR-85) to work?

If OPNsense has already tested it, what is the solution ?