4500PW02A-1 - Waveguide Grating Spectrometer A waveguide...

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Waveguide Grating Spectrometer A waveguide reflection grating spectrometer is used for wavelength division demultiplexing. Five telecommunication signal waves from the waveguide are in- cident in air upon the metallic grating at an angle of 15" counter-clockwise from the normal as shown in figure. The five waves have bequencies of 195.0 TeraHz, 195.5 TeraHz, 196.0 TeraHz, 196.5 TeraHz, and 197.0 TeraHz which are fi-equencies on the ITU standard grid. The five wavelengths are dispersed by the grating into +1-order backward-diffracted waves as shown in the figure. The grating is designated as having 800 lines per mm. An array of photodetectors is oriented normal to the 196.0 TeraHz (no. 3) beam as shown. Incident \ 1) Calculate, showing all work, the wavelengths in nanometers of the waves numbered 1, 2, 3, 4, and 5 in the figure. 2) Calculate, showing all work, the backward-diffracted wave angles (measured counter- clockwise from the normal) in degrees for these waves. 3)
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This note was uploaded on 04/29/2008 for the course ECE 4500 taught by Professor Gaylord during the Spring '08 term at Georgia Institute of Technology.

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4500PW02A-1 - Waveguide Grating Spectrometer A waveguide...

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