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

Instructions calculate the circuits by filling in all the

Instructions: Calculate the circuits by filling in all the blanks. 1. Et = 24 volts It = ______ amps Rt = ______ ohms 2. Et = 24 volts It = ______ amps Rt = ______ ohms 3. Et = 12 volts It = ______ amps Rt = ______ ohms ...

1 two point charges each of mass m and charge q are

1. Two point charges each of mass m and charge q are suspended by strings of length l from a common point. Find the value of q for which the angle made by the strings at the common point is 90°. 2. Point charges Q and ar ...

Assume you want to write a program to simulate the

Assume you want to write a program to simulate the permutation boxes in Figure 31.8 in the text. a. Show how you represent each box as a table. b. Show the inversion of each box as a table.

1 discuss the physical interpretation of amperes circuital

1. Discuss the physical interpretation of Ampere's circuital law in differential form for the simple case of 2. State Ampere's circuital law in differential form for the general case of an arbitrary magnetic field. How i ...

One of the attacks an intruder can apply to a simple cipher

One of the attacks an intruder can apply to a simple cipher like an additive cipher is called the ciphertext attack. In this type of attack, the intruder intercepts the cipher and tries to find the key and eventually the ...

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 ...

A signal is bandlimited to 12 khz the band between 9 and 12

A signal is bandlimited to 12 kHz. The band between 9 and 12 kHz has been corrupted by excessive noise to the point that the information within this band is nonrecoverable. Determine the minimum sampling rate for this si ...

Microelectronics1 what regions are heavily doped n to form

Microelectronics 1. What regions are heavily doped n+ to form ohmic contacts? 2. On the plot to the right. label the horzontal and vertical axis. Indicate the triode and square law regions. The square law region of secon ...

1 repeat the previous problem without the assumption that

1. Repeat the previous problem without the assumption that the velocity in the heating section is negligible. The ratio of the flow area of the heating section to the chimney flow area is R. 2. Consider a 4-cm pipe that ...

1 what is the particular advantageous characteristic

1. What is the particular advantageous characteristic associated with the unit vectors in the Cartesian coordinate system? 2. How do you find a vector perpendicular to a plane? 3. How do you find the perpendicular distan ...

  • 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