Advice about industrial bus for 3,7 Gbps transfers

You can use PCIe embedded core and low cost FPGA to communicate using PCIe over fiber at 2.5 Gb/s (205 MB/s device to PC benchmark) or 5 Gb/s using PCIe Gen2 (Stratix-IV).

Using multiple PCIe lanes you can communicate over fiber optic up to x4/x8 lanes.

To do so you need a Host controller similar to Adnaco-H1 and just place fiber optic transceivers on your board similar to Adnaco-RFPGA

Coming soon an Adnaco-H1A which support PCIe Gen2 (5 Gb/s) industrial temperature grade and Adnaco-H2 for x4 lanes.

Details you can find on adnaco web site.

Sergej