99$ USB3 Optical Fiber Extender Usb3 Optical Transceiver Usb3 0 Optical Isolation https://archive.is/wip/FpSde

chip on the back side is VL813 - Super Speed USB 3.0 Hub Controller

USB 3.0 (HUB)                      SFP Module
  +---------+                    +------------+
  |         |                    |            |
  |  TX+    |--------------------|  TX+       |
  |  TX-    |--------------------|  TX-       |
  |         |                    |            |
  |  RX+    |--------------------|  RX+       |
  |  RX-    |--------------------|  RX-       |
  +---------+                    +------------+

  Legend:
  TX+ / TX- : Transmit differential pair
  RX+ / RX- : Receive differential pair

https://media.ccc.de/v/38c3-going-long-sending-weird-signals-over-long-haul-optical-networks

• https://shop.sysmocom.de/SFP-experimenter-board-v2-kit/sfp-exp-v2-kit
• https://osmocom.org/projects/misc-hardware/wiki/Sfp-breakout

The Osmocom SFP breakout board is exactly what the name implies: A small break-out board for transceivers in SFP form factor.

You can use it for e.g. transmitting your own signals / waveforms (not restricted to Ethernet or CPRI) over fiber optics. This is e.g. useful if you need galvanic isolation between digital circuits, or need long-distance transmission e.g. between FPGA LVDS interfaces. attach some I2C adapter to the I2C pins of the SFP module in order to re-program it The SFP transceivers exhibit a symmetric/differencial interface for Rx and Tx. Each of them is exposed as a pair of SMA connectors, using differential traces between the SMA connectors and the transceiver module.

If you're interested in transmitting single-ended signals, please see the sfp-experimenter board instead. It's like the SFP breakout board, but contains differential transmitter + receivers.

Developed by VKSDR, this board integrates an SFP transceiver with FPGA development platforms via the Pmod interface. It supports single-ended signals and includes design files and gerbers for customization. VKSDR

Pluggable SFP (SFF INF-8074i) and SFP+ (SFF-8432) Module Breakout for developing SFP modules. PCB must be manufactured with a 1.0mm thickness.

https://github.com/mwrnd/SFP_Plug_Breakout

An open-source hardware and software project designed for reading and writing EEPROM data on SFP/SFP+ modules. It utilizes the Cypress CYC8CKIT-059 prototyping board as a USB interface, offering a cost-effective solution for SFP module programming. sfpdoctor

This simple breakout board facilitates experimentation with SFP transceivers, providing differential TX/RX pairs via SMA connectors. It's suitable for data rates up to at least 1 Gbps and includes status LEDs and rate-select jumpers. GITHUB

An open-source hardware and software project aimed at rapid prototyping of high-speed network devices. The platform includes FPGA-based boards with multiple SFP+ interfaces, supporting line-rate packet processing for networking research and development. WIKIPEDIA

A compact USB coding board designed for programming various SFP transceivers, including SFP, SFP+, and SFP28 modules. It supports flexible coding of different transceiver types and is suitable for network equipment suppliers and system integrators. SFPTOTAL

https://docs.telavivmakers.space/tamiwiki/users/6r1d/fiber_notes?s[]=sfp