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Show us your square wave

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bson:

--- Quote from: Keysight DanielBogdanoff on March 07, 2019, 12:31:16 am ---It's our calibration pulse, so essentially the fastest edge we can muster. It's a laser - it turns out optical is much easier at these frequencies.

--- End quote ---
That's pretty incredible!  :-+

Are there complete optical front ends for the UXR series?

tggzzz:

--- Quote from: Keysight DanielBogdanoff on March 07, 2019, 12:31:16 am ---
--- Quote from: HighVoltage on March 06, 2019, 10:34:48 am ---
WOW!
That would be a scope for Wave 2019!

What pulse generator are you using for this?

--- End quote ---

It's our calibration pulse, so essentially the fastest edge we can muster. It's a laser - it turns out optical is much easier at these frequencies.

--- End quote ---

Well, 110GHz is within a factor of 3 of being out of RF bands and into the IR bands!

David Hess:
NIST used what was effectively an optically driven sampling oscilloscope as their reference for calibrating pulse generators and I assume they still have it.  I always assumed HP/Agilent/Keysite had something similar to use in-house.  I think Tektronix sent their pulse reference to NIST for calibration.

At lower frequencies, low being up to 10s of GHz, it is possible to use 3 sampling heads to calibrate each other without any outside reference by measuring their kick-out pulses which are otherwise just annoying during normal use.

Electro Fan:

--- Quote from: Keysight DanielBogdanoff on March 06, 2019, 06:48:44 am ---So, not infinite bandwidth but...

how about 3.5 ps edge @ 113 GHz realtime bandwidth?  >:D :popcorn:

--- End quote ---

Wow - very cool and Thanks/Congrats to Daniel and Keysight for sharing!

I think that beats the previous best posted around here by over 10 ps.  We are now within less than 4 ps of seeing our first sub-picosecond rise time.  Maybe Keysight or someone has something laying around that can do that..... :)

Actually, we might only be about 2.5 ps away as under 1 ps would maybe qualify as sub PS? :)

Electro Fan:
Probably should go for the extra ~3.5 ps and get firmly into the realm of 3 digit femto seconds.

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