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Electronics

SFP loopback board

A simple SFP loopback board that loops back any received signal on the SFP RX-pins to the TX-pins. There's a voltage divider probing the signals, and an ONET1191P limiting amplifier provides amplified differential outputs, for probing the signal going through the SFP.

https://github.com/aewallin/SFP-Loopback-Board

Categories
Electronics

Simple SFP-breakout-board

Designed in 2018, but only now uploaded to github, a simple SFP breakout board for playing around with SFP or SFP+ transcievers.

In contrast to earlier boards, this one has no op-amps or transformers on the TX/RX lines, and bandwidth seems to be good enough for 1Gbit/s at least.

https://github.com/aewallin/SFP-Breakout-Board

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kicad-symbol

SFP Connector

20pin SMD connector + cage for SFP transceiver.

Categories
Electronics

500 MHz SFP-board (v4)

This is the fourth version of an interface board to Small Form Factor Pluggable optical transcievers (SFPs) with a bandwidth of >500 MHz. These are useful for various time/frequency experiments, with a measured frequency stability of <1e-13 @ 1s (in 0.5 or 5 Hz bandwidth) - perhaps slightly depending on what SFP is used. The SFP allows sending the signal along a single-mode fiber for 1-100 km easily.

ADT2-1T converts to and from differential signals while LMH6702 op-amps provide 3 dB gain. There are parallel outputs on the RX pins. The current-draw on +3V3 by the SFP is quite high - usually requiring heat-sinking on the voltage-regulator

KiCad files available on request.