Ch9Sec7 - This equation is Braggs law. All other...

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Dr. Joseph C. Palais 9.7 1 THE FIBER FORUM Fiber Optic Communications Dr. JOSEPH C. PALAIS PRESENTED BY
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Dr. Joseph C. Palais 9.7 2 Section 9.7 Fiber Bragg Grating
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Dr. Joseph C. Palais 9.7 3 A fiber Bragg grating is a fiber with periodic variations in the refractive index of the core along its axis. Λ Core L The alternating orange and yellow regions in the core indicate variations in refractive index between higher and lower values.
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Dr. Joseph C. Palais 9.7 4 The grating period is Λ. If Λ = λ / 2 (9-19) the wave is reflected.
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Unformatted text preview: This equation is Braggs law. All other wavelengths are transmitted so that the grating acts as a filter. The next slide illustrates application of the Bragg grating as a WDM drop filter. Dr. Joseph C. Palais 9.7 5 1 4 2 3 1 , 2 , 3 4 Reflected 1 , 2 , 3 , 4 4 Reflected The grating reflects 4 . Due to the phasing properties of the couplers, all the input power at 4 emerges from port 4. The other 3 wavelengths emerge from port 3. 4 Input...
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This note was uploaded on 05/11/2010 for the course EEE EEE-546 taught by Professor Palais during the Spring '10 term at ASU.

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Ch9Sec7 - This equation is Braggs law. All other...

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