Recent content by roujhan

Thanks a million Bob, about the method vibration modulates the light intensity: I want to use FBG (Fiber Bragg Grating) that its Bragg wavelength suffer shift when strain is applied to. since the vibration in fact is a dynamic strain, so with vibration the Bragg wavelength will change in time...

Dear Bob; thanks for your attention... I mean the modulating frequency bandwidth. e.g. the second page of the attached file mention the Low and high Cut-off Frequency. Or: Please see the "bandwidth" in : http://qphotonics.com/catalog/Fiber-coupled-InGaAs-PIN-photodiode-p-180.html this point...

I'm trying to design a fiber optic sensor to sense vibration via intensity modulation. I'm new in this field and i don't know whether I can use a PIN photodetector for low frequency or not... what's the bandwidth of a PIN Photodetector? Does it mean its responsivity is limited in low frequency...