这是一篇来自英国的关于激光基础知识和soa的作业代写
Answer all questions.
- Derive an expression for the frequency and wavelength spacing between the longitudinal modes of a Fabry-Perot laser. Explain why the Fabry-Perot spacing is constant in frequency but varies with wavelength.
- With the aid of suitable diagrams, indicate the type of lateral waveguiding used in:
- stripe waveguide laser
- ridge waveguide laser
- buried waveguide laser
With reference to the diagrams above, discuss the current confinement performance in each structure.
- Describe the self saturation process which limits the gain of a high gain SOA.q If I connect 2 high gain(30dB) SOA devices in series, estimate the gain of the system. What optical component could I place between them to increase the gain of the system?
- Plot the carrier lifetime versus carrier density for a SOA with A= 1×108s-1B= 3×10-10cm3s-1 and C=2×10-28 cm6 s-1. Indicate the regions on the curve where each of the A, B and C coefficients dominate the value of carrier lifetime.
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