lab4 - ECE 415 EXPERIMENT NO. 4 INTRODUCTION TO OPTICAL...

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1/28/2011 5-1 ECE 415 EXPERIMENT NO. 4 INTRODUCTION TO OPTICAL FIBERS PURPOSE : To determine the numerical aperture, and other characteristics of single- and multi-mode fibers and the radiant intensity pattern radiated from the fiber end. REFERENCES : 1. C. L. Chen, , Irwin, (1996), Chapters 8 and 9. A discussion of the state of polarization can be found in Section 6.2.3. 2. J. Gowar, Optical Communication Systems , Prentice Hall, (1984), Chapters 2 & 3. I. Math, "Simple Fiber Measurements," Laser Focus , p. 75, (Sept. 1979). (attached) PROCEDURES : 1. As a preliminary step, determine the optical power and the state of polarization of fields radiated by a light source (Figure 1). Use a set of neutral density filters (NDF) to attenuate light, if necessary. To determine the state of polarization, measure the ellipticity (i.e., P min /P max ) and the azimuth angle of the fields. Randomly polarized fields can be converted to linearly polarized fields by inserting a linear polarizer in the beam path. NDF Polarizer Analyzer Power meter Laser or LED Figure 1 Setup for determining power and state of polarization of a light source I. Multi-mode fibers 2. Use a 10X or 20X objective to couple light into a multi-mode fiber. Figure 2
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This note was uploaded on 02/12/2012 for the course ECE 415 taught by Professor Lab during the Spring '11 term at Purdue.

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lab4 - ECE 415 EXPERIMENT NO. 4 INTRODUCTION TO OPTICAL...

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