ece228 lecture 8

Ece228 lecture 8 - Bowers ECE 228A Nonlinearities Nonlinearities Lecture#8 John Bowers ECE 228A 228A Poincare Sphere A way to represent all

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Bowers ECE 228A onlinearities Nonlinearities Lecture #8 John Bowers CE 228A ECE 228A
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Bowers ECE 228A Poincare Sphere • A way to represent all polarizations states. •E quator: Linear polarization states • Poles: Right and left circular polarization • Half wave plates rotate around the pole. • Quarter wave plates go through the poles,…
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Bowers ECE 228A Poincare Sphere
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Bowers ECE 228A Real Polarization Controllers
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Bowers ECE 228A Fiber Optic Components Polarizer: A device that transmits one polarization and not the other. Relevant parameters: ansmission loss (0 5 dB) transmission loss (0.5 dB) – Degree of polarization selectivity (20 to 30 dB) – Wavelength range olarization Controller: A device that converts one polarization to Polarization Controller: A device that converts one polarization to another. Relevant parameters: – Transmission loss (0.5 dB) bility to reach all states of polarization Ability to reach all states of polarization – Adjustability (manual or electronic) – Speed avelength range – Wavelength range Isolator: A device that transmits in one direction only – Loss (1 dB) olation (30 dB) – Isolation (30 dB) – Wavelength range
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Bowers ECE 228A Fiber Optic Devices (cont) Directional coupler: A four port device that splits incoming light into two paths, and splits opposite directed light into two paths – Splitting ratio – Excess loss – Directivity Note: There is no such thing as a three port directional coupler. It may be hard to see the fourth port (radiation loss?) – Polarization dependence
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Ece228 lecture 8 - Bowers ECE 228A Nonlinearities Nonlinearities Lecture#8 John Bowers ECE 228A 228A Poincare Sphere A way to represent all

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