All Questions
Tagged with signal-processing laser
11
questions
0
votes
1
answer
40
views
Data transmission via laser illuminating the ceiling
I've heard a data transmission technique proposed more than once wherein a base station would fire a laser at the ceiling of an indoor space. The pulsing of this laser would be observed by one or more ...
2
votes
2
answers
128
views
How to find peak power at 1550nm using an optical meter?
I have a setup of tunable laser source at 1550nm connected to a spectrometer(Can't publish the name of spectrometer). The spectrometer has a range of 1510-1595 nm. The graph shows wavelength vs ...
0
votes
1
answer
43
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Why does CW imaging not provide the same data as Pulsed imaging?
"Unlike pulsed THz imaging, the CW imaging (...) only yields intensity data and does not provide any depth, frequency-domain or time-domain information (...)." [1]
Why does a pulsed signal ...
- 753
0
votes
0
answers
71
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Fringe movement analysis to extract displacement
I am using a Michelson interferometer with the interferogram recorded on a CMOS sensor. I have taken a video of the fringes moving when a displacement of 50 $\mu m$ is imposed to one of the mirrors.
...
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-2
votes
1
answer
190
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How to hide radio communications between airplanes? [closed]
I have 2 airplanes and I would like completely hide the communications between them.
There is a possible way that this communications would not be detected by our radio receivers around the world? ...
- 9
1
vote
1
answer
155
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Does the light pulse broadens in time when passing bandpass filter?
What I don't understand about relationship between laser pulse width in time and frequency, is where these rules apply, namely rules of Bandwidth-limited pulses.
Say, I have a femtosecond laser ...
1
vote
0
answers
27
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Is there a graphical summary of which modulation technique to use in communication systems using Visible Light Communication techniques?
I am currently looking at various papers written (some listed at the bottom) that discuss how laser pulses can be modulated to send encoded messages to a receiver for communication systems. The more I ...
- 221
7
votes
3
answers
1k
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Can we compress microsecond duration laser pulses by a factor of 1000?
I would like know how we can compress microsecond duration laser pulses by a factor of 1000 for a commercial aviation industry application.
Dr. Stephen Roberson Ph.D. and Dr Paul Pelligrino Ph.D. ...
- 347
0
votes
0
answers
55
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Deconvoluting Raman spectras from different wavelengths
I am using a laser source that is wider than typical laser source for Raman spectroscopy. This mean that the full width at half maximum (FWHM) of the laser is about 5-10 nm, compared to the normal 1-3 ...
- 31
5
votes
2
answers
449
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Why is Erbium Doped Fiber Amplifier (EDFA) preferred over Erbium Doped Waveguide Amplifier (EDWA)?
Why is Erbium Doped Fiber Amplifier (EDFA) preferred over Erbium Doped Waveguide Amplifier (EDWA)?
The question has been asked from an engineering point of view, but obviously I would also be ...
- 557
9
votes
2
answers
873
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How would one generate Brownian light? What would it look like?
When light is an equal mix of all visible frequencies, we call it white light.
By analogy, sound that is a mix of all audible frequencies is called white noise.
For sound, there is an additional ...
- 22.1k