Saying "OK" to that, my PC's network connection in the tool tray finally exhibited the correct behaviour, hunting, then displaying the message "This connection has limited or no availability", and my loopback was working.
I selected the Advanced tab and set Link Speed/Duplex Mode to a 100 Mbps setting (100 Mbps/Full Duplex). Due to the fact that the integrity of the signal is sensitive to any type of manipulation, there are many tools to diagnose and calibrate any errors that may be affecting the fiber optics performance. Sure enough, going into Device Manager or Network Connections, one can access configuration of the NIC. MPO Loopback Test Cable - Singlemode Fiber optics installment requires careful and meticulous handling. I realized that the driver installed on my PC should set that stuff. How to set the lower mode? The datasheet is full of things like "set this pin hi", and "write this register" etc. Googling around and downloading the datasheets, I read that lower than 1 Gbps modes don't have the crosstalk cancellation in my NIC.
With that, I was able to Google on external loopback wiring connections for gigabit ethernet and found, that had the wiring -In addition to 1&3 and 2&6, 4&7 and 5&8 also have to be connected- and a helpful reply about turning off the crosstalk cancellation - setting a loopback creates the appearance of 100% crosstalk.
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