22-Elec-B10 Electro-Optical Engineering
Worked solutions to 2 past sittings (2015–2017), 13 questions. Pick a sitting, or start from a topic below.
Topics across the sittings
Topics that come up in more than one sitting, taken from the headings of our worked solutions. A topic counts once per sitting.
- Bandwidth (2 sittings): December 2017 Q6 · May 2015 Q4
- Responsivity (2 sittings): December 2017 Q2 · May 2015 Q4
- Step-index fibre (2 sittings): December 2017 Q1 · May 2015 Q1
Questions by sitting
December 2017
- Question 1: Step-index fibre — acceptance, cladding index, mode count and intermodal dispersion
- Question 2: The pin photodiode — structure, fields, photoconductive operation, responsivity and response time
- Question 3: InGaAsP Fabry–Perot laser diode — photon and carrier lifetimes, mode spacing and output power
- Question 4: Digital fibre-link design — dispersion limit, attenuation limit and repeater spacing
- Question 5: Longitudinal LiNbO$_3$ Pockels-cell modulator — half-wave voltage, $R$ and $C$, and drive power
- Question 6: pin diode with a transimpedance front end — responsivity, bandwidth and required optical power
- Question 7: Graded-index versus step-index fibre — total dispersion and bandwidth–distance product
May 2015
- Question 1: Group Index, Dispersion and a Step-Index Fibre
- Question 2: LED Link Budget, Noise and Modulated SNR
- Question 3: GaAs LED Output and a Fabry–Perot Laser Diode
- Question 4: Silicon Photodiode — Responsivity, Bandwidth and Noise
- Question 5: Receiver Front-End Choice and the Erbium-Doped Fibre Amplifier
- Question 6: Power and Rise-Time Budget for a 1550 nm Link