"As mentioned before, keep the laser powered, but to add an information, lower the current of the laser. Don't turn it on or off completely. The circuit that drives the diode needs a short time to regulate itself when turned on."

I don't know how to realize it. I haven't found anything about the current these lasers need. It's just something between ~40mA and 100mA (transistor maximum).


"Check WWW.maxim-ic.com and look for MAX3930 ..."

_That_ is fast, although I need to build a complete new circuit. I'd like to see first, if we can get the old one a bit faster.

Thanks for all the advice,
Jörg

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to jez:

"If you email me I will send you a schematic for a wideband laser diode reciever which uses an op-297"

I'm interested in this circuit, but I can't find your e-mail adress here.