Hills Ball
06/12/2024 · Senior High School

A long single-mode optical fiber has an attenuation of \( 0.5 \mathrm{~dB} \mathrm{~km}-1 \) when operating at a wavelength of \( 1.3 \mu \mathrm{~m} \). The fiber core diameter is \( 6 \mu \mathrm{~m} \) and the laser source bandwidth is 600 MHz . a) Determine the Threshold Optical Powers for Simulated Brillouin (SBS). b) Determine the Threshold Optical Power for Stimulated Raman Scattering (SRS). c) Compare the threshold optical powers for stimulated Brillouin and Raman scattering within the fiber at the wavelength specified. d) Why SBS and SRS are not usually observed in multimode fibers?

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a) The threshold optical power for SBS is approximately 3.4 mW. b) The threshold optical power for SRS is also approximately 3.4 mW. c) The threshold optical powers for SBS and SRS are approximately equal in this case. d) SBS and SRS are not usually observed in multimode fibers due to mode coupling, larger effective area, higher losses, and different propagation constants.

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