17-Phys-B2 Electro-Optical Engineering
Worked solutions to 3 past sittings (2015–2018), 20 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 (3 sittings): December 2018 Q6 · December 2017 Q6 · May 2015 Q4
- Acceptance Angle (2 sittings): December 2018 Q1 · December 2017 Q1
- Dispersion (2 sittings): December 2018 Q1 · December 2017 Q1
- Modes (2 sittings): December 2018 Q1 · December 2017 Q1
- PIN Photodiode (2 sittings): December 2018 Q3 · December 2017 Q2
Questions by sitting
December 2018
- Question 1: Silica Step-Index Fiber — Acceptance Angle, Modes, Dispersion, Bend Loss and PMD
- Question 2: GaAs Laser Diode — Longitudinal Modes, RIN, DFB Structure and Grating Period
- Question 3: PIN Photodiode — Load Line, Saturation, Output Characteristic and Bandwidth Limit
- Question 4: Receiver SNR — Thermal and Shot-Noise Limits, APD Gain and Photon Counting
- Question 5: Y-Branch Mach–Zehnder Interferometer — Transfer Function, Modulator, Switch and QAM
- Question 6: LED Structures, Bandwidth, GaAs Output Characteristics and Photon-Counting Statistics
- Question 7: 100 km Fiber Link — Single-Mode Check, Dispersion Limit, DCF Sizing and Power Budget
December 2017
- Question 1: Step-Index Fiber — Acceptance Angle, Cladding Index, Modes and Dispersion
- Question 2: PIN Photodiode — Structure, Photocurrent and Responsivity
- Question 3: InGaAsP Fabry–Perot Laser — Photon Lifetime, Carrier Lifetime, Mode Spacing and Output Power
- Question 4: 40 km Digital Fiber Link — Dispersion and Attenuation Limits, Repeaters, Modes
- Question 5: Longitudinal Pockels-Cell Modulator (LiNbO 3 )
- Question 6: PIN + Transimpedance Amplifier — Responsivity, Bandwidth and Required SNR
- Question 7: Optimal Graded-Index Fiber — Dispersion and Bandwidth–Length Product
May 2015
- Question 1: Group Index, Dispersion Parameter, and a Step-Index Fiber at 1350 nm
- Question 2: 850 nm LED/PIN Link — Loss Budget and SNR
- Question 3: GaAs LED Emission and a GaAs Quantum-Well Fabry-Perot Laser
- Question 4: Silicon Photodiode — Measured Responsivity, Bandwidth, and Noise
- Question 5: Receiver Front-End Choice and the Erbium-Doped Fiber Amplifier
- Question 6: 1550 nm, 250 Mb/s, 75 km Single-Mode Link Design