# hw5 - power of 250 μ W at 1300 nm and an optical power of...

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HW #5 due 3/1/11 5PM no later than 3/5/11 5PM 1. a) Assuming length of the fiber is L, find the delay owing to dispersion for the fiber in HW 4 Problem 2. b) Find the data rate times distance product R b × L for the fiber in HW 4 Problem 2. c) Assuming length of the fiber is L, find the delay owing to dispersion for the fiber in HW 4 Problem 4. d) Find the data rate times distance product R b × L for the fiber in HW 4 Problem 4. 2. a) Consider a standard non-dispersion-shifted single mode fiber that has a zero-dispersion wavelength at 1310nm with a dispersion slope of S 0 = 0. 09 ps /( km - nm 2 ). Plot the dispersion in the wav elength range 1250 nm λ 1350 nm with computer. b) A typical dispersion-shifted single-mode fiber has zero-dispersion wav elength 1550nm with a dispersion slope of 0.070 ps /( km - nm 2 ). Plot the dispersion in the wav elength range 1450 nm 1650 nm with computer. 3. A certain optical fiber has an attenuation of 0.6dB/km at 1300nm and 0.3dB/km at 1550nm. Suppose the following twooptical signals are launched simultaneously into the fiber: an optical
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Unformatted text preview: power of 250 μ W at 1300 nm and an optical power of 200 W at 1550 nm. What are the power levels in W of these two signal at (a) 2km and (b) 6km? 4. A system has a transmitter with power of 3mW and a receiver requires at least 0.4mW for reliable reception. a) If we use a fiber with attenuation of 0.5dB/km, what is the maximum length of the fiber without repeater? b) If our communication system must be 50km long without repeater, what should be the attenu-ation of the fiber? Extra-Credit for undergraduate (regular for graduate) 5. A 1.3 m lightwav e system users a 50km fiber link and requires at least 0.3 W at the receiver. The fiber loss is 0.5dB/km. Fiber is spliced (fused together owing to standard spool only having certain length) every 5 km and has two connectors of 1dB at both ends. Splice loss is only 0.2dB. Determine the minimum power that must be launched into the fiber....
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## This note was uploaded on 03/06/2012 for the course ENGINEERIN 605 taught by Professor Rahmir during the Spring '11 term at University of Wisconsin.

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