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2/21/2011 9-1 ECE 415 EXPERIMENT NO. 7 FIBER-OPTIC MACH-ZEHNDER INTERFEROMETERS PURPOSE : To introduce the basic principle of optical interferometry, to illustrate the use of interferometers in engineering applications and to introduce the use of single-mode optical fibers and fiber couplers in interferometric sensors. REFERENCES : 1. E. Udd, Fiber Optic Sensors: An Introduction for Engineers and Scientists , John Wiley & Sons, Inc., (1991), Chapter 10. 2. A. Dandridge and A. D. Kersey, "Overview of Mach-Zehnder Sensor Technology and Applications," Proceedings, SPIE Vol. 985, Fiber Optic and Laser Sensors VI (1988), The International Society for Optical Engineering, pp. 34-52. 3. Several papers in Optical Fiber Sensors , Conference Edition , 1988 Technical Digest Series, Vol. 2, Part 1, Interferometric Techniques, pp. 40-58. 4. S. Tolansky, An Introduction to Interferometry , Wiley and Sons, Inc., second edition, (1973), Chapters 8 and 9. 5. The Mach-Zehnder interferometer (attached). 6. PZT Primer (attached) PROCEDURES : Read Ref. [5, 6] before proceeding further with the experiment. 1. Arrange a laser, microscope objectives, fiber-optic positioners (FOP), fiber couplers, a PZT cylinder, a beam splitter, etc. as sho wn in Figure 1. Don’t touch, bump or break the fiber tips. In Steps 1 through 6, no voltage is applied to the PZT cylinder. 2. Use microscope objectives to couple light into each input end of the fiber coupler. The input ends (port 1 and 2) of the fiber coupler are on the side of the fiber coupler that contains the PZT cylinder. With no light into the other input end, adjust each fiber optic positioner (FOP) separately until a bright beam emerges from the output ends of the fiber coupler. Use a power meter to monitor one of the outputs (port 3 and 4) and adjust each input FOP for maximum coupling into each fiber.
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