Lecture_24Mar10

Lecture_24Mar10 - ECE 299, Spring 10, Stiff-Roberts Page 1...

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Unformatted text preview: ECE 299, Spring 10, Stiff-Roberts Page 1 March 24, 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 Directional Coupler Input/Output Coupler Grating Waveguide Coupler ECE 299, Spring 10, Stiff-Roberts Page 2 March 24, 2010- Directional couplers use multiple waveguide, codirectional coupling.- We will consider two-channel directional couplers with two parallel waveguides, each supporting only its fundamental mode (single mode waveguides).- In general, coupling is not symmetric unless the two waveguides are identical.- The solutions to the coupled mode equations are known. Again, the main step is to determine the specific form of the coupling coefficients. Directional Couplers ( ) ( ) 1 2 ~ ~ ~ ~ 2 2 = = + + = = = bb aa aa a bb b z i ba z i ab c c e A i dz B d e B i dz A d [ ] c ~ 1 = c ( ) + = = dxdy z c dxdy ~ * * * H E H E E E Two-mode coupling and Coupling coefficients: ECE 299, Spring 10, Stiff-Roberts Page 3 March 24, 2010 Directional Couplers ECE 299, Spring 10, Stiff-Roberts...
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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_24Mar10 - ECE 299, Spring 10, Stiff-Roberts Page 1...

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