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17-Phys-B2 Electro-Optical Engineering: December 2018

Nivaar worked solution (AI-drafted; not reviewed by a licensed engineer)

  1. Question 1 Silica Step-Index Fiber — Acceptance Angle, Modes, Dispersion, Bend Loss and PMD
  2. Question 2 GaAs Laser Diode — Longitudinal Modes, RIN, DFB Structure and Grating Period
  3. Question 3 PIN Photodiode — Load Line, Saturation, Output Characteristic and Bandwidth Limit
  4. Question 4 Receiver SNR — Thermal and Shot-Noise Limits, APD Gain and Photon Counting
  5. Question 5 Y-Branch Mach–Zehnder Interferometer — Transfer Function, Modulator, Switch and QAM
  6. Question 6 LED Structures, Bandwidth, GaAs Output Characteristics and Photon-Counting Statistics
  7. Question 7 100 km Fiber Link — Single-Mode Check, Dispersion Limit, DCF Sizing and Power Budget

Start with Question 1 →

Paper format. 17-Phys-B2 Electro-Optical Engineering, National Examination December 2018 — a three-hour closed-book examination (one 8.5×11 inch double-sided handwritten note sheet permitted). The cover page states any five of the seven questions constitute a complete paper and only the first five as they appear in the answer book are marked; every question is nonetheless answered in full below so the paper remains a complete study resource.

Reference texts. G. Keiser, Optical Fiber Communications, 4th ed. (fiber modes, dispersion and bend loss; laser-diode longitudinal modes and DFB gratings; PIN photodiode responsivity, noise and receiver design; link power and dispersion budgets); B. E. A. Saleh and M. C. Teich, Fundamentals of Photonics, 2nd ed. (semiconductor optical gain, LED spontaneous-emission linewidth, avalanche-photodiode noise); A. Yariv, Quantum Electronics / E. Hecht, Optics, 5th ed. (Mach–Zehnder interferometry and electro-optic modulators).