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

1 how would you use amperes circuital law in differential

1. How would you use Ampere's circuital law in differential form to find the magnetic field adjacent to the current sheet? 2. If the current density on the infinite plane current sheet of Figure 4.2 were directed in the ...

The rate of shear work per unit volume is given by the

The rate of shear work per unit volume is given by the product tv. For a parabolic velocity profile in a circular tube (see given Example), determine the distance from the wall at which the shear work is maximum. Example ...

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 when a doublet is added to a uniform stream so that the

1. When a doublet is added to a uniform stream so that the source part of the doublet faces the stream, a cylinder flow results. Plot the streamlines when the doublet is reversed so that the sink faces the stream. 2. A 2 ...

1 what is the significance of a nonzero net right-lateral

1. What is the significance of a nonzero net right-lateral differential of and normal to the z-direction at a point in space? 2. If a pair of E and B at a point satisfies Faraday's law in differential form, does it neces ...

1 in transform coding show that a receiver that receives an

1. In transform coding, show that a receiver that receives an M matrix can create the original p matrix. 2. Calculate the T matrix for DCT when N = 1, N = 2, N = 4, and N = 8. 3. Using one-dimensional DCT encoding, calcu ...

1 what does the word retarded in the terminology retarded

1. What does the word retarded in the terminology retarded magnetic vector potential refer to? Explain. 2. Discuss the application of the magnetic vector potential in the determination of the electromagnetic fields due t ...

1 what is the significance of a nonzero net right-lateral

1. What is the significance of a nonzero net right-lateral differential of and normal to the z-direction at a point in space? 2. If a pair of E and B at a point satisfies Faraday's law in differential form, does it neces ...

Through a series of tests on pipe flow h darcy derived an

Through a series of tests on pipe flow, H. Darcy derived an equation for the friction loss in pipe flow as in which f is a dimensionless coefficient that depends on (a) the average velocity v of the pipe flow; (b) the pi ...

1 discuss the general solutions for the line voltage and

1. Discuss the general solutions for the line voltage and current in time-domain and the notation associated with their representation in concise form. 2. What is the fundamental distinction between the occurrence of the ...

  • 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

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

Describe what you learned about the impact of economic

Describe what you learned about the impact of economic, social, and demographic trends affecting the US labor environmen