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Optical fiber & transistor

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jayce3390

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Optical fiber

I would like to combine RF transistor and optical fibers in hybrid design.

My questions are :

1) I m wondering if optical fiber can handle high power at S frequency band?
2) Do you think optical fibers could realize a matching network at S frequency band?
 
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I think the optical fiber has a part number and you can find the power handling capacity of the optical fiber in the data sheet. I am sure about the second question.
 
I am just curious about this topic:
1. Will you inject S Band signal directly in optical fiber? because optical fiber is very thin, how can you do that?
2. Will the signal leak from the fiber, or the attenuation should be very bigger?
 
This sounds like one of those posts that have lost something in the translation! Optical fibers can, in general, handle tens of killowatts...if the power is OPTICAL, ie. like at 1550 nm!
I do not know what you mean by an optical matching network at Sband. You are way too low in frequency to propagate anything at Sband on and optical fiber directly. Are you confusing sending microwaves down the fiber, which you can not do, with sending light down the fiber that is modulated by microwave frequencies, which you can do?
 
Thank you all,

Ok I understand you need a laser source around 1550 nm because Silica is "transparent" for this wavelength. But some people are working on optical fiber wiring to replace basic coaxial cables. In this way you can gain weight in the case of satellites.

How do they do to transmit RF frequencies?
 

They don't replace only the coax cables. They replace ENTIRE communication system.
 

vfone,

As I know they don't replace the SSPA which is part of the RF tray and the SSPA is still working at S band for a mobile telecom satellite.
 

You can send microwave energy from point A to point B by having a modulatable laser diode sending pulsing light along a fiberoptic strand, and at the end you have a photodiode that converts the pulsing light back to microwaves.

Unfortunately, you typically lose 15 dB of microwave power when you do that, and can introduce other bad things like intermodulation distortion to the original microwave signal. So by the time you reamplify the signal (need more DC current draw for the laser diode and the amplifier) it is not so attractive.
 
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