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

1what is an electric dipole how is its strength defined2

1.What is an electric dipole? How is its strength defined? 2. What are the different kinds of polarization in a dielectric? 3. What is the polarization vector? How is it related to the electric field intensity? 4. Discus ...

1 what is the total distance around the circumference of a

1. What is the total distance around the circumference of a circle of radius 1 m? What is the total vector distance around the circle? 2. What is the total surface area of a cube of sides 1 m? Assuming the normals to the ...

1 assume an application program uses separate audio and

1. Assume an application program uses separate audio and video streams during an RTP session. How many SSRCs and CSRCs are used in each RTP packet? 2. Can we say UDP plus RTP is the same as TCP? 3. Why does RTP need the ...

1 state gauss law for the electric field2 how is volume

1. State Gauss' law for the electric field. 2. How is volume charge density defined? 3. State the law of conservation of charge. 4. How is Gauss' law for the electric field derived from Ampere's circuital law?

Tasks1learn how to use opendss2open and execute the epri

Tasks 1. Learn how to use OpenDSS 2. Open and execute the EPRI Test Circuit 24 model 3. Develop base case data sets of bus voltages and power flows 4. Provide analysis of the base case model: a. Feeder voltage profiles b ...

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 the rocket nozzle shown below consists of three welded

1. The rocket nozzle shown below consists of three welded sections. Determine the axial stress at junctions 1 and 2 when the rocket is operating at sea level. The mass flow rate is 770 lb m /s. 2. The pressure on the con ...

A current distribution is given bywhere j0 is a constant

A current distribution is given by where J 0 is a constant. Using Ampere's circuital law in differential form and symmetry considerations, find the magnetic field everywhere.

A discuss asymptotic and bibo stabilities for the systems

a. Discuss asymptotic and BIBO stabilities for the systems described by the following transfer functions assuming that the systems are controllable and observable: b. Repeat part (a) for systems described by the followin ...

1 find the unit vector normal to the plane then find the

1. Find the unit vector normal to the plane . Then find the distance from the origin to the plane. 2. Write the expression for the differential length vector dl at the point (1, 2, 8) on the straight line and having 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