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17-Phys-B2 Electro-Optical Engineering: May 2015

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

  1. Question 1 Group Index, Dispersion Parameter, and a Step-Index Fiber at 1350 nm
  2. Question 2 850 nm LED/PIN Link — Loss Budget and SNR
  3. Question 3 GaAs LED Emission and a GaAs Quantum-Well Fabry-Perot Laser
  4. Question 4 Silicon Photodiode — Measured Responsivity, Bandwidth, and Noise
  5. Question 5 Receiver Front-End Choice and the Erbium-Doped Fiber Amplifier
  6. Question 6 1550 nm, 250 Mb/s, 75 km Single-Mode Link Design

Start with Question 1 →

Paper format. 98-Phys-B2 Electro-Optical Engineering, National Examination May 2015 — 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 six 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. Figure-based Question 4 is solved against the actual photodiode responsivity curve printed on the exam, not an assumed shape.

Reference texts. G. Keiser, Optical Fiber Communications, 4th ed. (fiber modes and dispersion, link power and risetime budgets, LED/laser and photodiode characteristics, EDFA); B. E. A. Saleh and M. C. Teich, Fundamentals of Photonics, 2nd ed. (LED spectral width, laser diode rate equations, photodiode noise); E. Hecht, Optics, 5th ed. (waveguiding and dispersion background).