Optical Gian vs Electrical Gain

AI Thread Summary
Optical gain, such as that provided by an EDFA, offers significantly higher bandwidth compared to electrical gain from devices like PIN and transimpedance amplifiers. To convert a coherent optical signal into an incoherent one, methods such as using a diffuser can effectively reduce coherence. The discussion also touches on the need for chirping the signal, potentially through non-linear mediums. Clarifications are sought regarding the effects of diffusers on both spatial and temporal coherence. Overall, the conversation explores the trade-offs between optical and electrical gain in signal processing.
narra
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Hi,
I was wondering what the trade-offs were in having an optical gain (say with EDFA) compared to electrical gain (say with a PIN and transimpedance amplifier) of an optical signal.
Thanks.
 
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Is it possible to turn a very coherent signal into one much less

Hi,

I am curious to know if there any passive (or simple active) methods to convert a very coherent signal into an incoherent one? I suppose I would need to find a way to chirp the signal and a non-linear medium might be one method. Any ideas?

Thanks

narra
 
For coherent optical signals, a component called a diffuser is normally used to reduce the coherence.

Regarding your first post, optical gain has a much higher bandwidth than electrical gain.

Claude.
 
Hi Sorry, I somehow posted a question within another post. Thanks for your reply on both though. I have a few more things to ask based on your answers if you don't mind.

Post 1: When you say optical gain is much higher bandwidth, do you mean in terms of gain available across and optical bandwidth or temporally?

Post 2: Is a diffuser more to break the spatial coherence? If so, how does this impart temporal coherence?

Or

perhaps to stimulate higher order modes; forming "Speckle"?

Regards,

narra
 

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