Category: Optical Communication

This set of Optical Communication Multiple Choice Questions & Answers (MCQs) focuses on “LED Characteristics”. 1. Linearizing circuit techniques are used for LEDs.a) Trueb) False 2. The internal quantum efficiency of LEDs decreasing _______________ with ________________ temperature.a) Exponentially, decreasingb) Exponentially, increasingc) Linearly, increasingd) Linearly, decreasing 3. Intrinsically _________________ are a very linear device.a) Injection lasersb) […]

This set of Optical Communication Multiple Choice Questions & Answers (MCQs) focuses on “LED Structures”. 1. In optical fiber communication _____________ major types of LED structures are used.a) 2b) 4c) 6d) 3 2. As compared to planar LED structure, Dome LEDs have ______________ External power efficiency ___________ effective emission area and _____________ radiance.a) Greater, lesser, […]

This set of Optical Communication Multiple Choice Questions & Answers (MCQs) focuses on “LED Power and Efficiency”. 1. The excess density of electrons Δnand holes Δpin an LED is ____________a) Equalb) Δpmore than Δnc) Δn more than Δpd) Does not affects the LED 2. The hole concentration in extrinsic materials is _________ electron concentration.a) much […]

This set of Optical Communication Multiple Choice Questions & Answers (MCQs) focuses on “Mid – Infrared and Far – Infrared Lasers”. 1. Auger current is mostly ___________________ for material with band gap providing longer wavelength emission.a) Unaffectedb) Lesserc) Largerd) Vanishes 2. Injection lasers operating in smaller wavelengths are subjected to increased carrier losses.a) Trueb) False […]

This set of Optical Communication Multiple Choice Questions & Answers (MCQs) focuses on “Narrow – Linewidth and Wavelength – Tunable Lasers”. 1. _______________ occurs as a result of the change in lasing frequency with gain.a) Frequency multiplicationb) Dispersionc) Attenuationd) Line-width broadening 2. Laser cavity length can be extended by ___________a) Increasing the refractive indexb) Reducing […]

This set of Optical Communication Multiple Choice Questions & Answers (MCQs) focuses on “Non – Semiconductor Lasers”. 1. In Nd: YAG lasers, the maximum doping levels of neodymium is ____________a) 0.5 %b) 1.5 %c) 1.8 %d) 2 % 2. Which of the following is not a property of Nd: YAG laser that enables its use […]

This set of Optical Communication Multiple Choice Questions & Answers (MCQs) focuses on “Injection Laser Characteristics”. 1. The process where the energy released during the recombination of an electron-hole event getting transferred to another carrier is known as __________a) Inter-valence bond absorptionb) Auger recombinationc) Carrier leakage effectsd) Exothermic actions 2. Auger recombination can be reduced […]

This set of Optical Communication Multiple Choice Questions & Answers (MCQs) focuses on “Single – Frequency Injection Lasers”. 1. Device which apply the frequency-selective feedback technique to provide single longitudinal operation are referred to as ________________a) DSM lasersb) Nd: YAG lasersc) Glass fiber lasersd) QD lasers 2. Which of the following does not provide single […]

This set of Optical Communication Multiple Choice Questions & Answers (MCQs) focuses on “Some Injection Laser Structures”. 1. What is the strip width of injection laser?a) 12 μmb) 11.5 μmc) Less than 10 μmd) 15 μm 2. Some refractive index variation is introduced into lateral structure of laser.a) Trueb) False 3. In multimode injection lasers, […]

This set of Optical Communication Multiple Choice Questions & Answers (MCQs) focuses on “The Semiconductor Injection Laser”. 1. In semiconductor injection laser, narrow line bandwidth is of the order?a) 1 nm or lessb) 4 nmc) 5 nmd) 3 nm 2. Injection laser have a high threshold current density of __________a) 104Acm-2 and moreb) 102Acm-2c) 10-2Acm-2d) 10-3Acm-2 […]