ECE_437_Lab1 SP10

ECE_437_Lab1 SP10 - ECE 4370 Fiber and Integrated Optics...

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Read this entire document before starting the laboratory session. The laboratory reports should be clear, concise and written in good English. Answer all of the questions asked throughout the experiment and at the end. Feel free to contact the Lab Assistant (Howard Kim hgk5) with any questions you may have. The laboratory sessions are not difficult. The demonstrations performed in the lab on February 15 in conjunction with the instructions herein contained should be more than sufficient for each team to complete the experiments without any difficulty. Every team member should learn and put to practice all of the techniques. NEVER STARE AT THE LASER BEAM. Even at low power, laser light can still be dangerous. Some of the equipment in the laboratory is very expensive and sensitive. Please be careful, and do not lean on these devices nor put anything unnecessary on them. There is a webcam attached to the data acquisition computer. The webcam is used to take snapshots at different stages of the experiment, which will be included in the report. You may want to bring a flash drive to save the webcam pictures. 1 ECE 4370 Fiber and Integrated Optics: Lab I Optical Fiber Numerical Aperture Measurement 15 February, 2010 Reports due by 03 March 2010
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Objectives Measure the acceptance angle and determine the numerical aperture of the three different types of fibers. Apply this knowledge to determining the numerical aperture to a glass microscope slide. Equipment – additional parts, available in the laboratory, may be required. HeNe Laser Objective Lens – FL10B 90 ° Angle Lens Mount XYZ Translation stages Base Plates Posts Post Holders Optical Fiber Holders 90 ° Angle Stand Fiber cleaver Fiber stripper Tweezers Cotton Swabs Circular Target Isopropyl Alcohol Microscope slide Microscope slide mount Rotational stage Background An optical fiber consists of a guiding core that is surrounded by a cladding. The core and cladding are normally made of silica glass, although polymer materials can also be used. The core- cladding ensemble is usually covered by a plastic jacket. Light is transmitted through the core which has a higher index of refraction than the cladding. The basic construction of a fiber is shown in the figure to the right. Via total internal reflection, light transmitted in a fiber remains confined inside the core, where the index of refraction is highest. The simplest type of fiber is called a step index fiber. There is a discontinuity, a step , in the index of refraction between the core and the cladding. This is shown in the figure to the left. If a light ray is to be guided through a fiber (via total internal reflection), a light ray must enter the core (this is called coupling ) with an angle that is less than the acceptance angle for the fiber. This angle is measured perpendicularly to the cross-section of the fiber. A ray which enters the fiber at an angle greater than the acceptance angle will not be coupled into the core. The
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ECE_437_Lab1 SP10 - ECE 4370 Fiber and Integrated Optics...

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