1. An optical link at 850 and 1310 nm Consider an optimal graded index fiber as shown in Figure 1 with a core diameter o

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1 An Optical Link At 850 And 1310 Nm Consider An Optimal Graded Index Fiber As Shown In Figure 1 With A Core Diameter O 1 (83.92 KiB) Viewed 41 times

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1. An optical link at 850 and 1310 nm Consider an optimal graded index fiber as shown in Figure 1 with a core diameter of 50 um. Its axial numerical aperture (NA corresponding to r=0) is 0.20. Assume the cladding is pure silica. The detector is a pin photodiode with a rise/fall time of 50 ps. The fiber is used in an optical link over a distance of 400 m. 50/125 50 um o K125 um Index Profile Figure 1 A graded index fiber (a) Operation at 850 nm with a VCSEL: The above fiber is used with a VCSELD (vertical cavity surface emitting laser diode) at 850 nm. The LD has equal rise and fall times of 0.1 ns. Make the necessary assumptions to find the maximum bit-rate and the optical bandwidth of this link. (b) Operation at 1310 nm with an LED: The above fiber is used with an LED (light emitting diode) at 1310 nm. The LED has equal rise and fall times of 1 ns. Make the necessary assumptions to find the maximum bit-rate and the optical bandwidth of this link. What is the bit-rate if we decrease the operating temperature of the LED down to -30°C?