Ask Question, Ask an Expert

+1-415-315-9853

info@mywordsolution.com

Ask Electrical & Electronics Expert

problem 1: Describe the method of optical feedback to give oscillations and therefore amplification in the laser. Point out how this gives a distinctive spectral output from the device.

problem 2: Describe edge emitting and surface emitting diodes.

problem 3: With the help of schematic diagram describe the structure of Febry Parot cavity.

problem 4: Outline the general LED structures for optical fiber communication describing their relative advantages and drawbacks. In particular compare surface and edge emitting devices. Comment on the difference between multimode and single mode devices.

problem 5: A planer LED is fabricated from gallium arsenide that has a refractive index of 3.6.

a) Compute the optical power emitted into air as a percentage of internal optical power for the device when the transmission factor at the crystal-air interface is 0.68.

b) When the optical power generated internally is 50 percent of the electrical power supplied, find out the external power efficiency.

problem 6: The radiative and non-radiative recombination lifetimes of minority carriers in the active region of double hetro junction LED are 60ns and 100ns correspondingly. Find out the total carrier recombination lifetime and the power internally generated in the device when the peak emission wavelength is 0.87um at a drive current of 40mA.

problem 7: Compute the ratio of the stimulated emission rate to the spontaneous emission rate for an incandescent lamp operating at a temperature of 1000K. It might be supposed that the average operating wavelength is 0.5 micrometer.

problem 8: A ruby LASER comprises of a crystal length 4 cm with a refractive index of 1.78. The peak emission wavelength from the device is 0.55micrometer. Find out the number of longitudinal modes and their frequency separation.

problem 9: Compare the approximate radiative minority carrier lifetimes in the Gallium arsenide and Silicon if the minority carriers are electrons injected to the p-type region which consists of a hole concentration of 1018 cm-3. The injected electron density is small compared with majority carrier density.

problem 10: What do you understand by the principle of photo detector?

Electrical & Electronics, Engineering

  • Category:- Electrical & Electronics
  • Reference No.:- M97412

Have any Question? 


Related Questions in Electrical & Electronics

Consider a plane-strain square element with unit depth as

Consider a plane-strain square element with unit depth as shown in the figure. Use the St. Venant-Kirchhoff isotropic material model with two Lame's constants λ and μ. A uniformly distributed force T x  (force per area) ...

1 what is the laplacian of a scalar what is its expansion

1. What is the Laplacian of a scalar? What is its expansion in Cartesian coordinates? 2. State Poisson's equation. 3. Outline the solution of Poisson's equation for the potential in a region of known charge density varyi ...

Suppose a geologist has collected 15 specimens of a certain

Suppose a geologist has collected 15 specimens of a certain rock, call it R1, and 10 specimens of another rock, call it R2. A laboratory assistant selects randomly 15 specimens for analysis, and let X be the r.v. denotin ...

Projecta cyclolron is an electrically - powered device that

Project A cyclolron is an electrically - powered device that is used to accelerate particles, specifically using both Electrostatic fields and Magneto static fields to accelerate charged particles outwards from a center ...

1 what determines the sense of the current flow in an image

1. What determines the sense of the current flow in an image antenna relative to that in the actual antenna? 2. How does the concept of an image antenna simplify the determination of the radiation pattern of an antenna a ...

1 fluid flows between two parallel plates a distance h

1. Fluid flows between two parallel plates, a distance h apart. The upper plate moves at velocity, v 0 ; the lower plate is stationary. For what value of pressure gradient will the shear stress at the lower wall be zero? ...

For a uniform plane wave propagating in free space the

For a uniform plane wave propagating in free space, the apparent phase velocities along the x- and y-directions are found to be respectively. Find the direction of propagation of the wave.

1 discuss how the solution for the electromagnetic field

1. Discuss how the solution for the electromagnetic field given by (4.52) corresponds to that of a uniform plane wave. 2. Why is the quantity known as the phase constant? 3. What is phase velocity? How is it related to t ...

1 why can the magnetic flux density vector be expressed as

1. Why can the magnetic flux density vector be expressed as the curl of another vector? 2. Discuss the analogy between the magnetic vector potential due to an infinitesimal current element and the electric scalar potenti ...

The relationship between deformed and undeformed

The relationship between deformed and undeformed coordinates for the pure bending of a plane-strain solid is given as Compare the engineering strain and Lagrangian strain. Show that the two strain measures become identic ...

  • 4,153,160 Questions Asked
  • 13,132 Experts
  • 2,558,936 Questions Answered

Ask Experts for help!!

Looking for Assignment Help?

Start excelling in your Courses, Get help with Assignment

Write us your full requirement for evaluation and you will receive response within 20 minutes turnaround time.

Ask Now Help with Problems, Get a Best Answer

WalMart Identification of theory and critical discussion

Drawing on the prescribed text and/or relevant academic literature, produce a paper which discusses the nature of group

Section onea in an atwood machine suppose two objects of

SECTION ONE (a) In an Atwood Machine, suppose two objects of unequal mass are hung vertically over a frictionless

Part 1you work in hr for a company that operates a factory

Part 1: You work in HR for a company that operates a factory manufacturing fiberglass. There are several hundred empl

Details on advanced accounting paperthis paper is intended

DETAILS ON ADVANCED ACCOUNTING PAPER This paper is intended for students to apply the theoretical knowledge around ac

Create a provider database and related reports and queries

Create a provider database and related reports and queries to capture contact information for potential PC component pro