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# TUT4 - OPTICAL FIBER COMMUNICATION SYSTEM TUT-4 OPTICAL...

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° OPTICAL FIBER COMMUNICATION SYSTEM PROF. A.M.ALLAM TUT-4 OPTICAL SOURCES

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± OPTICAL FIBER COMMUNICATION SYSTEM PROF. A.M.ALLAM 1-An injection laser has a GaAs active region with bandgap energy of 1.43 eV. Estimate the wavelength of optical emission from the device. 2- Assume that the optical power from a LED varies with modulation frequency according to this relation: Show that the 3-dB-optic and detected-electrical bandwidths are related by 2 2 1 τ ω + = s s aI P ( ) ( ) electrical f optic f dB dB - - = 3 3 73 . 1
² OPTICAL FIBER COMMUNICATION SYSTEM PROF. A.M.ALLAM 3-The relation of optical power to current for an LED is given by P = 0.02 i. The maximum allowed power is 10 mW. The LED has a dc bias current and a 1MHz ac current applied. (a) Sketch the power-current curve (b) If the peak signal power is 2mW and the peak total power is 10 mW, compute the total peak current, the dc current, the average power, and the modulation index (peak signal power/average power).

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