how to multiply optical signal to electrical signal

plz guys guide me how can i multiply the optical signal with electrical signal.

my system consist from
LED connected to optical fiber, at the receiver i have photo diode NOW i want multiply pump signal ( which is optical signal ) with photo diode signal. plz tell me how

hence: this is the last problem in my project
tnx

Can you provide the schematic diagram.

Are you trying to send light from a standard LED to an optical fiber and then use a standard photo-diode to pick it up ?
Or do you use devices that are designed to work with optical fiber ..

I think this is one of several threads about an optical parametric amplifier.

https://www.edaboard.com/thread190917.html
https://www.edaboard.com/thread190992.html
https://www.edaboard.com/thread190831.html
https://www.edaboard.com/thread190809.html

I am not sure it is going anywhere.

@other-side-of-d-moon - do you think you really understand what an optical parametric amplifier is, how it is constructed and how it works? Until you do, I think you will get nowhere.

Keith.

tnx for ur replay my scheme is shown bellow

tnx for ur replay my scheme is shown bellow

He obviously needs some sort of optical hetrodyning technique, maybe something like a vacuum port to improve noise floor, but can not articulate what he really needs.
something along these lines:

Encyclopedia of Laser Physics and Technology - optical heterodyne detection, balanced detection, homodyne detection, coherent detection

No, I think he is after one of these:

Encyclopedia of Laser Physics and Technology - optical parametric amplifiers, OPA, non-degenerate, phase-sensitive amplification

Keith.

hey Keith,
my thoughts exactly. he appears to be taking on a project that is way out of his depth of understanding
and as a result he's not going to be happy unless some one else does all the work for him and provide him with a total working project :( in the mean time he's going to continue to post multiple threads on the same subject

it seems to be something we are seeing more and more on these forums. People delving deep into projects when they dont even understand the basics :(

Dave
VK2TDN

Dave,

Yes, it does seem that the forum sometimes looks like a "... type your homework question here ..." site. Still there are also a large number of people who try first and post here when they are stuck who deserve help.

Keith.

yup and thats the main reason why I stick around :)

D

And that is not a bad thing. One way to stay sharp as an engineer is to teach others. If you can not teach it, you really did not know it in the first place. I find the lack of experienced engineers who are willing to teach the newbies simply apalling!

I do wish students would spend a little more time actually explaining what they want to ask. Maybe it is the twitter mentality bred here. They need to lay out their question in a more thoughtful way, and they will get good responses here.

Effective questions open the door to knowledge and understanding ..

Address your first question to yourself: if you could press a magic button and get every piece of information you want, what would you want to know? The answer will immediately help you compose the right questions ..

this is the most garbage i never heard about. I wasn't imagine one day this website will contain people have ability to discourage the others.

Its shaaaaaaaaaame on you. And u knw ur self

So now all the people who try to help are criticised by the person who has so far started 5 threads on the same subject!

Keith

At least, he's giving the impression. Personally, I was confused by the schematic with a title "parametric amplifier" but without an optical amplifier in the signal path.

Technically, there is mainly a misunderstanding or an unsuitable usage of terms, I guess. Interestingly, the thread "circuit design of ppa", that has the only meaningful schematic among various others presented in the discussion, shows an electrical parametric amplifier. Apparently, that's what's the original poster is chasing for. https://www.edaboard.com/attachments...dddddddddd-jpg

I'm not an expert in this field, but the term optical parametric amplifier (OPA) is clearly reserved for optical amplifiers (using non-linear crystals). The term photo (or photonic) parametric amplifier (PPA) isn't commonly used at all. But the said diagram understands it as an electrical system (without telling about the design details). The specific property, in addition to a basic parametric amplifier, is the fact, that the pump carrier frequency is also fed through optical path.

P.S.: Reviewing the above linked "PPA" schematic, I must add, that it's far from being clear. But it gives at least an idea of the intended function. To understand the context, we should also know the origin of the drawing.

tnx sir for ur encourage and guiding the others