Re: True-time Delay Element for Laser Communications System

In article <1179921686.225779.217640@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>, "susheemg@xxxxxxxxx" <susheemg@xxxxxxxxx> wrote:
I am working on the design of a laser communications system that
requires true-time delay elements. Specifically, I want to be able to
add a delay optically to a modulated signal. The max delay is ~250
ps, and I would like to be able to control the delay electronically in
steps of about 10 ps. The driving factor is the total loss through
the element, which must be minimized. The element itself can operate
on the signal in a fiber or the signal in free-space. Are there
papers that discuss low-loss methods to perform this delay?

Thanks,
Susheem


I have used acousto optic modulators as delay elements, typically for more
in the microsecond range. I suspect that there are commercial devices that
could do what you want though. Try searching under Crystal Technology Inc,
Newport Electro-optics (I think they are under a new owner now though). CTI
has lots of online data sheets that have the delay spec's, etc.
Good Luck!

D.
.

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