Computer/Computer Networks MCQs Set-2 Sample Test,Sample questions

Question:
A BH can have anything from a single electron to several electrons.

1.True

2.False


Question:
A double-channel planar buried hetero-structure (DCP BH) has a planar active region, the confinement material is?

1.Alga AS

2.InGaAsP

3.GaAs

4.SiO2


Question:
A four-port FBT coupler has 60μW optical power launched into port one. The output powers at ports 2, 3, 4 are 0.0025, 18, and 22 μW respectively. Find the split ratio?

1.42%

2.46%

3.52%

4.45%


Question:
A four-port multimode fiber FBT coupler has 50 μW optical power launched into port 1. The measured output power at ports 2,3 and 4 are 0.003, 23.0 and 24.5 μW respectively. Determine the excess loss.

1.0.22 dB

2.0.33 dB

3.0.45 dB

4.0.12 dB


Question:
A number of three-port single-mode fiber couplers are used in the fabrication of a ladder coupler with 16 output ports. The three-port couplers each have an excess loss of 0.2 dB along with a splice loss of 0.1 dB at the interconnection of each stage. Determine the excess loss.

1.1.9 dB

2.1.4 dB

3.0.9 dB

4.1.1 dB


Question:
A perfect semiconductor crystal containing no impurities or lattice defects is called as __________

1.Intrinsic semiconductor

2.Extrinsic semiconductor

3.Excitation

4.Valence electron


Question:
A _____________ coupler comprises a number of cascaded stages, each incorporating three or four-port FBT couplers to obtain a multiport output.

1.Star

2.Ladder

3.WDM

4.Three-port


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

1.Greater, lesser, reduced

2.Higher, greater, reduced

3.Higher, lesser, increased

4.Greater, greater, increased


Question:
Better confinement of optical mode is obtained in __________

1.Multi Quantum well lasers

2.Single Quantum well lasers

3.Gain guided lasers

4.BH lasers


Question:
Buried hetero-junction (BH) device is a type of _____________ laser where the active volume is buried in a material of wider band-gap and lower refractive index.

1.Gas lasers.

2.Gain guided lasers.

3.Weak index guiding lasers.

4.Strong index guiding lasers.


Question:
Calculate the splitting loss if a 30×30 port multimode fiber star coupler has 1 mW of optical power launched into an input port.

1.13 dB

2.15 dB

3.14.77 dB

4.16.02 dB


Question:
Couplers insertion loss is same as that of excess loss.

1.True

2.False


Question:
DH surface emitter generally give ____________

1.More coupled optical power

2.Less coupled optical power

3.Low current densities

4.Low radiance emission into-fiber


Question:
Dot-in-well device is also known as __________

1.DH lasers

2.BH lasers

3.QD lasers

4.Gain guided lasers


Question:
How many fabrication techniques are used for 3 port fiber couplers?

1.One

2.Two

3.Three

4.Four


Question:
How many manufacturing methods are used for producing multimode fiber star couplers?

1.Two

2.One

3.Three

4. Five


Question:
How many types of multiport optical fiber couplers are available at present?

1.Two

2.One

3.Four

4.Three


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

1.Increased

2.Reduced

3.Lost

4.Unaffected


Question:
In Buried hetero-junction (BH) lasers, the optical field is confined within __________

1.Transverse direction

2.Lateral direction

3.Outside the strip

4.Both transverse and lateral direction


Question:
In multimode injection lasers, the construction of current flow to the strip is obtained in structure by __________

1.Covering the strip with ceramic

2.Intrinsic doping

3.Implantation outside strip region with protons

4.Implantation outside strip region with electrons


Question:
In optical fiber communication _____________ major types of LED structures are used.

1.2

2.4

3.6

4.3


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

1.BH structures

2.QC structures

3.DH structures

4.Gain-guided structure


Question:
Internal absorption in DH surface emitter Burros type LEDs is ____________

1.Cannot be determined

2.Negligible

3.High

4.Very low


Question:
It is a device that distributes light from a main fiber into one or more branch fibers.

1.Optical fiber coupler

2.Optical fiber splice

3.Optical fiber connector

4.Optical isolator


Question:
Mesa structured SLEDs are used ____________

1.To reduce radiance

2.To increase radiance

3.To reduce current spreading

4.To increase current spreading


Question:
Multi-quantum devices have superior characteristics over __________

1.BH lasers

2.DH lasers

3.Gain guided lasers

4.Single-quantum-well devices


Question:
Optical fiber couplers are also called as ________________

1.Isolators

2.Circulators

3.Directional couplers

4.Attenuators


Question:
Problems resulting from parasitic capacitances can be overcome __________

1.Through regrowth of semi-insulating material

2.By using oxide material

3.By using a planar InGaAsP active region

4.By using a AlGaAs active region


Question:
Quantum well lasers are also known as __________

1.BH lasers

2.DH lasers

3.Chemical lasers

4.Gain-guided lasers


Question:
Quantum well lasers are providing high inherent advantage over __________

1.Chemical lasers

2.Gas lasers

3.Conventional DH devices

4.BH device


Question:
Some refractive index variation is introduced into lateral structure of laser.

1.True

2.False


Question:
Strip geometry of a device or laser is important.

1.True

2.False


Question:
The active layer of E-LED is heavily doped with ____________

1.Zn

2.Eu

3.Cu

4.Sn


Question:
The amount of radiance in planer type of LED structures is ____________

1.Low

2.High

3.Zero

4.Negligible


Question:
The energy-level occupation for a semiconductor in thermal equilibrium is described by the __________

1.Boltzmann distribution function

2.Probability distribution function

3.Fermi-Dirac distribution function

4.Cumulative distribution function


Question:
The InGaAsP is emitting LEDs are realized in terms of restricted are ____________

1.Length strip geometry

2.Radiance

3.Current spreading

4.Coupled optical power


Question:
The majority of the carriers in a p-type semiconductor are __________

1.Holes

2.Electrons

3.Photons

4. Neutrons


Question:
The optical power coupled from one fiber to another is limited by ____________

1.Numerical apertures of fibers

2.Varying refractive index of fibers

3.Angular power distribution at source

4.Number of modes propagating in each fiber


Question:
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.

1.0.03

2.0.05

3.0.3

4.0.01


Question:
The recombination in indirect band-gap semiconductors is slow.

1.True

2.False


Question:
The techniques by Burros and Dawson in reference to homo structure device is to use an etched well in GaAs structure.

1.True

2.False


Question:
The _______ method is the most commonly used method for the determination of the fiber refractive index profile.

1.Refracted near-field method

2.Bending-reference

3.Power step method

4.Alternative test method


Question:
What is done to create an extrinsic semiconductor?

1.Refractive index is decreased

2.Doping the material with impurities

3.Increase the band-gap of the material

4.Stimulated emission


Question:
What is the strip width of injection laser?

1.12 μm

2.11.5 μm

3.Less than 10 μm

4.15 μm


Question:
When considering source-to-fiber coupling efficiencies, the ________ is an important parameter than total output power.

1.Numerical aperture

2.Radiance of an optical source

3.Coupling efficiency

4.Angular power distribution


Question:
Which impurity is added to gallium phosphide to make it an efficient light emitter?

1.Silicon

2.Hydrogen

3.Nitrogen

4.Phosphorus


Question:
Which is the most common method for manufacturing couplers?

1.Wavelength division multiplexing

2.Lateral offset method

3.Semitransparent mirror method

4.Fused bi-conical taper (FBT) technique


Question:
________ couplers combine the different wavelength optical signal onto the fiber or separate the different wavelength optical signal output from the fiber.

1.3-port

2.2*2-star

3.WDM

4.Directional


Question:
_______________ method does not require a leaky mode correction factor or equal mode excitation.

1.Bending-reference

2.Power step method

3.Alternative test method

4.Refracted near-field method


Question:
_________________ is used when the optical emission results from the application of electric field.

1.Radiation

2.Efficiency

3.Electro-luminescence

4.Magnetron oscillator


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