Lately we're doing some small 6-layer boards with breakaway tabs for fixturing. So there can be freebie little circuits that snap off.
We use the Micrel SY88022 laser driver in a few off-label applications, and we don't know enough about it, so I hung a test circuit on an upcoming board.
Every fast SFP module must have something like this inside, and a lot more.
"Most recent" is a matter of fact - there's no suggestion that 1997 is a recent year. Larkin seems to be trying to tell us that he is up with the start of the art, and if that is the case, the art hasn't changed much in the past thirty years. In reality most of the fast stuff today is buried inside fancy (and rather expensive) fast programmable logic devices which I've not been able to get my claws on.
The fiddling around with microstrip lines (on the surface of a printed circuit board ) and the less dispersive buried stripline (on inner layers of a multiplayer board) goes back rather more than thirty years. It's a necessary part of putting stuff together, but not all that exciting.
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