Lecture_31Mar10

Lecture_31Mar10 - Course: ECE 299 Guided Wave Optics...

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ECE 299, Spring ‘10, Stiff-Roberts Page 1 March 31, 2010 Course: ECE 299 – Guided Wave Optics Location: Hudson Hall 115A Instructor: Dr. Stiff-Roberts Office: FCIEMAS 3511 Office Hours: Th 10:00am - 1:00pm Phone: 660-5560 E-mail: astiff@ee.duke.edu Last Class This Class • Electro-optic Modulators • Guided Wave Electro-optic Modulators • Electro-optic Effects • Pockels Effect
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ECE 299, Spring ‘10, Stiff-Roberts Page 2 March 31, 2010 Electro-optic Modulators • Phase Modulators: - Optical wave is linearly polarized in direction parallel to one of the principal axes ( X , Y , Z ) in the presence of the modulation field. - Ideally, choose principal axis with large electro-optically induced index change that remains in fixed direction as applied field magnitude changes.
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ECE 299, Spring ‘10, Stiff-Roberts Page 3 March 31, 2010 Electro-optic Modulators • Polarization Modulators: - Optical wave is not linearly polarized in direction parallel to any principal axes in presence of modulation field, so the optical field is decomposed into two linearly polarized normal modes. - If two normal modes see different field-induced indices of refraction, there is a field- dependent phase retardation between the two modes. - The polarization of the optical wave at the crystal output can then be controlled by the modulation field.
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Page 4 March 31, 2010 Electro-optic Modulators • Amplitude Modulators: - Constructed by placing a polarization modulator between a polarizer at the input and a polarizer at the output (called an analyzer). Typically, the axes of the two polarizers are orthogonal. - The transmittance of the amplitude modulator depends on the phase retardation of the
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This note was uploaded on 01/16/2011 for the course ECE 299 taught by Professor Staff during the Fall '08 term at Duke.

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Lecture_31Mar10 - Course: ECE 299 Guided Wave Optics...

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