Author: mike7411@gmail.comDate: 16:28 27-04-07
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I was wondering if someone can help point me towards some information
on how RF to optical converters and vice versa typically work. I am
wondering if they generally involve some kind of analog to digital
conversion, or if they usually just perform a frequency shift from
radio frequencies to optical frequencies.
Any help is appreciated. Thank you.
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Author: CharlesDate: 17:57 27-04-07
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<mike7411@gmail.com> wrote in message
news:1177705698.910752.150530@r3g2000prh.googlegroups.com...
>I was wondering if someone can help point me towards some information
> on how RF to optical converters and vice versa typically work. I am
> wondering if they generally involve some kind of analog to digital
> conversion, or if they usually just perform a frequency shift from
> radio frequencies to optical frequencies.
Lots of new stuff out there but the old way was to demodulate the RF signal
and then use that recovered information to modulate the light source.
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Author: John LarkinDate: 23:59 27-04-07
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On 27 Apr 2007 13:28:19 -0700, "mike7411@gmail.com"
<mike7411@gmail.com> wrote:
>I was wondering if someone can help point me towards some information
>on how RF to optical converters and vice versa typically work. I am
>wondering if they generally involve some kind of analog to digital
>conversion, or if they usually just perform a frequency shift from
>radio frequencies to optical frequencies.
>
>Any help is appreciated. Thank you.
The wideband stuff uses a CW laser and a lithium niobate linear
modulator. The receiver end is easy, just a GaAs pin diode and a
wideband amp. Think 10's of kilobucks for a link.
The slower ones directly modulate the laser.
Google "optical rf link"
John
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Author: mike7411@gmail.comDate: 16:20 01-05-07
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On Apr 27, 3:57 pm, "Charles" <charlesschu...@comcast.net> wrote:
> <mike7...@gmail.com> wrote in message
>
> news:1177705698.910752.150530@r3g2000prh.googlegroups.com...
>
> >I was wondering if someone can help point me towards some information
> > on how RF to optical converters and vice versa typically work. I am
> > wondering if they generally involve some kind of analog to digital
> > conversion, or if they usually just perform a frequency shift from
> > radio frequencies to optical frequencies.
>
> Lots of new stuff out there but the old way was to demodulate the RF signal
> and then use that recovered information to modulate the light source.
Thank you. By the way, do you know if the unit at
http://www.blondertongue.com/fiberoptics/twinstar.pdf
performs analog to digital conversion and vice versa?
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Author: CharlesDate: 17:25 02-05-07
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<mike7411@gmail.com> wrote in message
news:1178050829.093864.230900@y5g2000hsa.googlegroups.com...
> On Apr 27, 3:57 pm, "Charles" <charlesschu...@comcast.net> wrote:
>> <mike7...@gmail.com> wrote in message
>>
>> news:1177705698.910752.150530@r3g2000prh.googlegroups.com...
>>
>> >I was wondering if someone can help point me towards some information
>> > on how RF to optical converters and vice versa typically work. I am
>> > wondering if they generally involve some kind of analog to digital
>> > conversion, or if they usually just perform a frequency shift from
>> > radio frequencies to optical frequencies.
>>
>> Lots of new stuff out there but the old way was to demodulate the RF
>> signal
>> and then use that recovered information to modulate the light source.
>
> Thank you. By the way, do you know if the unit at
>
> http://www.blondertongue.com/fiberoptics/twinstar.pdf
>
> performs analog to digital conversion and vice versa?
It appears to perform RF to optical and other things as well.
Analog means continuous (an infinite number of levels). Digital means
discrete (HI-LO or ON-OFF). RF means a range of frequencies below the
visible spectrum. Optical means light (eye-viewable) frequencies. Darned
confusing, all of this is!
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