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From: email@example.com (Steve Pepper)
Subject: Re: Comb/Harmonic Generators
Date: 16 Dec 2002 10:20:07 -0800
References: <3DF54583.49C9@Spam.Bots> <firstname.lastname@example.org> <3DF9B8A5.585A@Spam.Bots> <email@example.com> <3DFAAFF0.35C2@Spam.Bots> <3DFB16A2.firstname.lastname@example.org>
NNTP-Posting-Date: 16 Dec 2002 18:20:07 GMT
Rene Tschaggelar wrote in message news:<3DFB16A2.email@example.com>...
> The paper describes how the sampling head is built.
> They use a short pulse laser and generate the signals with photodiodes.
> Since there is always a laser pulse shorter than any current
> electronics, there still is room for improvement in bandwidth.
> A laserpulse of 100fs is fairly simple, from there on it becomes
I should point out that the laser is not used in the operation of the
sampler. It merely provides the test waveform and the trigger for the
The bandwidth limitation, in both the sampler and the step
generator, is due to the packaging, i.e. the transition to 1-mm coax.
As far as we know, the O-E step generator we built provides the
fastest electrical transition ever achieved at a coaxial interface.
The coaxial interface in the O-E step generator is similar to that
used in the sampler, so we feel reasonably comfortable assigning equal
speed to the signal generator and the sampler, as described in the
Yes, there is room for improvement in bandwidth, but connector
moding above 110 GHz will become a problem for any 1-mnm coaxial-based
measurement system. On-wafer measurements do not suffer this
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