Question 1

If a particular optical power is coupled from an incoherent LED into a low-NA fiber, the device must exhibit very high radiance .

Accepted Answer

A) True 
 B)False  True

Question 2

A planar LED fabricated from GaAs has a refractive index of 2.5. Compute the optical power emitted when transmission factor is 0.68.

Accepted Answer

A) 3.4 % 
B) 1.23 % 
C) 2.72 % 
D) 3.62 % 
A) 3.4 % 
B) 1.23 % 
C) 2.72 % 
D) 3.62 % C

Question 3

The techniques by Burros and Dawson in reference to homo structure device is to use an etched well in GaAs structure. Determine the given statement is True or false.

Accepted Answer

A) True 
 B)False  True

Question 4

In surface emitter LEDs, more advantage can be obtained by using

Accepted Answer

A) bh structures 
B) qc structures 
C) dh structures 
D) gain-guided structure 
A) bh structures 
B) qc structures 
C) dh structures 
D) gain-guided structure

Question 5

DH surface emitter generally give

Accepted Answer

A) more coupled optical power 
B) less coupled optical power 
C) low current densities 
D) low radiance emission into-fiber 
A) more coupled optical power 
B) less coupled optical power 
C) low current densities 
D) low radiance emission into-fiber

Question 6

Mesa structured SLEDs are used

Accepted Answer

A) to reduce radiance 
B) to increase radiance 
C) to reduce current spreading 
D) to increase current spreading 
A) to reduce radiance 
B) to increase radiance 
C) to reduce current spreading 
D) to increase current spreading

Question 7

In a GaAs LED, compute the loss relative to internally generated optical power in the fiber when there is small air gap between LED and fiber core. (Fiber coupled = 5.5 * 10-4Pint)

Accepted Answer

A) 34 db 
B) 32.59 db 
C) 42 db 
D) 33.1 db 
A) 34 db 
B) 32.59 db 
C) 42 db 
D) 33.1 db

Question 8

In a multimode fiber, much of light coupled in the fiber from an LED is

Accepted Answer

A) increased 
B) reduced 
C) lost 
D) unaffected 
A) increased 
B) reduced 
C) lost 
D) unaffected

Question 9

Compute power internally generated within a double-heterojunction LED if it has internal quantum efficiency of 64.5 % and drive current of 40 mA with a peak emission wavelength of 0.82 ?m.

Accepted Answer

A) 0.09 
B) 0.039 
C) 0.04 
D) 0.06 
A) 0.09 
B) 0.039 
C) 0.04 
D) 0.06

Question 10

The overall power conversion efficiency of electrical lens coupled LED is 0.8% and power applied 0.0375 V. Determine optical power launched into fiber

Accepted Answer

A) 0.03 
B) 0.05 
C) 0.3 
D) 0.01 
A) 0.03 
B) 0.05 
C) 0.3 
D) 0.01

Question 11

For a GaAs LED, the coupling efficiency is 0.05. Compute the optical loss in decibels.

Accepted Answer

A) 12.3 db 
B) 14 db 
C) 13.01 db 
D) 14.6 db 
A) 12.3 db 
B) 14 db 
C) 13.01 db 
D) 14.6 db

Question 12

In optical fiber communication, ______________ major types of LED structures are used

Accepted Answer

A) 2 
B) 4 
C) 6 
D) 3 
A) 2 
B) 4 
C) 6 
D) 3

Question 13

The InGaAsP is emitting LEDs are realized in terms of restricted

Accepted Answer

A) length strip geometry 
B) radiance 
C) current spreading 
D) coupled optical power 
A) length strip geometry 
B) radiance 
C) current spreading 
D) coupled optical power

Question 14

The Lambertian intensity distribution __________ the external power efficiency by some percent.

Accepted Answer

A) reduces 
B) does not affects 
C) increases 
D) have a negligible effect 
A) reduces 
B) does not affects 
C) increases 
D) have a negligible effect

Question 15

As compared to planar LED structure, Dome LEDs have ______________ External power efficiency, ____________ effective emission area and _____________ radiance.

Accepted Answer

A) greater, lesser, reduced 
B) higher, greater, reduced 
C) higher, lesser, increased 
D) greater, greater, increased 
A) greater, lesser, reduced 
B) higher, greater, reduced 
C) higher, lesser, increased 
D) greater, greater, increased

Question 16

Intrinsically _________________ are a very linear device.

Accepted Answer

A) injection lasers 
B) dh lasers 
C) gain-guided 
D) leds 
A) injection lasers 
B) dh lasers 
C) gain-guided 
D) leds

Question 17

A DH surface emitter LED has an emission area diameter of 60?m. Determine emission area of source

Accepted Answer

A) 1.534*10-6 
B) 5.423*10-3 
C) 3.564*10-2 
D) 2.826*10-9 
A) 1.534*10-6 
B) 5.423*10-3 
C) 3.564*10-2 
D) 2.826*10-9

Question 18

Determine the overall power conversion efficiency of lens coupled SLED having forward current of 20 mA and forward voltage of 2 V with 170 ?Wof optical power launched into multimode step index fiber.

Accepted Answer

A) 1.256*10?5 
B) 4.417*102 
C) 4.25*10-3 
D) 2.14*10-3 
A) 1.256*10?5 
B) 4.417*102 
C) 4.25*10-3 
D) 2.14*10-3

Question 19

The amount of radiance in planer type of LED structures is

Accepted Answer

A) low 
B) high 
C) zero 
D) negligible 
A) low 
B) high 
C) zero 
D) negligible

Question 20

A planar LED is fabricated from GaAs is having a optical power emitted is 0.018% of optical power generated internally which is 0.018% of optical power generated internally which is 0.6 P. Determine external power efficiency.

Accepted Answer

A) 0.18% 
B) 0.32% 
C) 0.65% 
D) 0.9% 
A) 0.18% 
B) 0.32% 
C) 0.65% 
D) 0.9%

If a particular optical power is coupled from an incoherent LED into a low-NA fiber, the device must exhibit very high radiance .

A planar LED fabricated from GaAs has a refractive index of 2.5. Compute the optical power emitted when transmission factor is 0.68.

The techniques by Burros and Dawson in reference to homo structure device is to use an etched well in GaAs structure. Determine the given statement is True or false.

In surface emitter LEDs, more advantage can be obtained by using

DH surface emitter generally give

Mesa structured SLEDs are used

In a GaAs LED, compute the loss relative to internally generated optical power in the fiber when there is small air gap between LED and fiber core. (Fiber coupled = 5.5 * 10-4Pint)

In a multimode fiber, much of light coupled in the fiber from an LED is

Compute power internally generated within a double-heterojunction LED if it has internal quantum efficiency of 64.5 % and drive current of 40 mA with a peak emission wavelength of 0.82 ?m.

The overall power conversion efficiency of electrical lens coupled LED is 0.8% and power applied 0.0375 V. Determine optical power launched into fiber

For a GaAs LED, the coupling efficiency is 0.05. Compute the optical loss in decibels.

In optical fiber communication, ______________ major types of LED structures are used

The InGaAsP is emitting LEDs are realized in terms of restricted

The Lambertian intensity distribution __________ the external power efficiency by some percent.

As compared to planar LED structure, Dome LEDs have __ External power efficiency, effective emission area and _ radiance.

Intrinsically _________________ are a very linear device.

A DH surface emitter LED has an emission area diameter of 60?m. Determine emission area of source

Determine the overall power conversion efficiency of lens coupled SLED having forward current of 20 mA and forward voltage of 2 V with 170 ?Wof optical power launched into multimode step index fiber.

The amount of radiance in planer type of LED structures is

A planar LED is fabricated from GaAs is having a optical power emitted is 0.018% of optical power generated internally which is 0.018% of optical power generated internally which is 0.6 P. Determine external power efficiency.

Fiber Optics Communication

Optical Fibers: Refraction, Transmission Losses, and Dispersion

Fiber Optics: Dispersion, Absorption, and Losses

Optical Fiber Communication: Scattering, Polarization, and Dispersion

Fiber Optics and Dispersion

Fiber Optics Fabrication Techniques and Phenomena

Optical Fiber Communication and Fabrication

Various Aspects of Optical Fiber Design and Performance

Fiber Optic Coupling and Losses

Fiber Splicing Techniques and Requirements

Optical Fiber Devices and Components

Yag Laser and Optical Fiber Communications

Semiconductor Laser Technologies: Refractive Index, Junctions, Efficiency, and Structures

Semiconductor Laser Devices and Mechanisms

Key Concepts in Laser and Optical Fiber Communication Technology

Laser Technology and Devices

Optical Communication and Led Performance Analysis

Filters

Exam 17: Led Efficiency and Power Generation in Optical Communication

If a particular optical power is coupled from an incoherent LED into a low-NA fiber, the device must exhibit very high radiance .

A planar LED fabricated from GaAs has a refractive index of 2.5. Compute the optical power emitted when transmission factor is 0.68.

The techniques by Burros and Dawson in reference to homo structure device is to use an etched well in GaAs structure. Determine the given statement is True or false.

In surface emitter LEDs, more advantage can be obtained by using

DH surface emitter generally give

Mesa structured SLEDs are used

In a GaAs LED, compute the loss relative to internally generated optical power in the fiber when there is small air gap between LED and fiber core. (Fiber coupled = 5.5 * 10-4Pint)

In a multimode fiber, much of light coupled in the fiber from an LED is

Compute power internally generated within a double-heterojunction LED if it has internal quantum efficiency of 64.5 % and drive current of 40 mA with a peak emission wavelength of 0.82 ?m.

The overall power conversion efficiency of electrical lens coupled LED is 0.8% and power applied 0.0375 V. Determine optical power launched into fiber

For a GaAs LED, the coupling efficiency is 0.05. Compute the optical loss in decibels.

In optical fiber communication, ______________ major types of LED structures are used

The InGaAsP is emitting LEDs are realized in terms of restricted

The Lambertian intensity distribution __________ the external power efficiency by some percent.

As compared to planar LED structure, Dome LEDs have ______________ External power efficiency, ____________ effective emission area and _____________ radiance.

Intrinsically _________________ are a very linear device.

A DH surface emitter LED has an emission area diameter of 60?m. Determine emission area of source

Determine the overall power conversion efficiency of lens coupled SLED having forward current of 20 mA and forward voltage of 2 V with 170 ?Wof optical power launched into multimode step index fiber.

The amount of radiance in planer type of LED structures is

A planar LED is fabricated from GaAs is having a optical power emitted is 0.018% of optical power generated internally which is 0.018% of optical power generated internally which is 0.6 P. Determine external power efficiency.

Fiber Optics Communication

Optical Fibers: Refraction, Transmission Losses, and Dispersion

Fiber Optics: Dispersion, Absorption, and Losses

Optical Fiber Communication: Scattering, Polarization, and Dispersion

Fiber Optics and Dispersion

Fiber Optics Fabrication Techniques and Phenomena

Optical Fiber Communication and Fabrication

Various Aspects of Optical Fiber Design and Performance

Fiber Optic Coupling and Losses

Fiber Splicing Techniques and Requirements

Optical Fiber Devices and Components

Yag Laser and Optical Fiber Communications

Semiconductor Laser Technologies: Refractive Index, Junctions, Efficiency, and Structures

Semiconductor Laser Devices and Mechanisms

Key Concepts in Laser and Optical Fiber Communication Technology

Laser Technology and Devices

Optical Communication and Led Performance Analysis

Filters

As compared to planar LED structure, Dome LEDs have __ External power efficiency, effective emission area and _ radiance.