Hi Attila,
> The goal is to make two lasers locked with about 7GHz of offset to > eachother. > > So far, i figured out that PIN photodiodes can go up to several 100MHz > transition frequency and avalanche photodiodes are available up to 2GHz. > If you need photodiode response only near 7 GHz, as seems likely, then maybe the reactance of the 2 GHz diode can be tuned out with some sort of matching circuit in the hope of getting usable response near 7 GHz. Better and simpler to get a diode with flat response all the way from DC to 7 GHz, though, of course. Depending on the application, you might be able to tolerate pretty high mixer losses, as you mention, but if you do need the best possible SNR, an I/Q configuration would give slightly lower noise at the cost of two diodes and amplifiers. Cheers, Peter _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
