The concentricity errors between the fiber core and the outside diameter of the jeweled ferrule are in the range of ___________ with multimode step-index fibers.

Multimode graded index fibers have overall buffer jackets same as multimode step index fibers but have core diameters ___________

A

Larger than multimode step index fibers

B

Smaller than multimode step index fibers

C

Same as that of multimode step index fibers

D

Smaller than single mode step index fibers

The typical average losses for multimode graded index fiber and single mode fiber with the precision ceramic ferrule connector are _____________ respectively.

A

0.3 and 0.5 dB

B

0.2 and 0.3 dB

C

0.1 and 0.2 dB

D

0.4 and 0.7 dB

Multimode step index fiber has a large core diameter of range is ___________

A

100 to 300 μm

B

100 to 300 nm

C

200 to 500 μm

D

200 to 500 nm

Bi-conical ferrule connectors are less advantageous than cylindrical ferrule connectors.

A

FalseStat

B

True

A polymer matrix composite is reinforced with long continuous ceramic fibers aligned in one direction. The young's moduli of the matrix and fibers are Em and Er respectively and the volume fraction of the fibers is f. Assuming iso-stress condition, Young's modulus of the composite Ec in a direction perpendicular to the length of fibers, is given by the expression

A

Ec = (1 - f) E_m + f E_f

B

Ec = f Em + (1 - f) Er

C

$$\frac{1}{{Ec}} = \frac{{\left( {1 - f} \right)}}{{{E_m}}} + \frac{f}{{Ef}}$$

D

$$\frac{1}{{Ec}} = \frac{f}{{{E_m}}} + \frac{{\left( {1 - f} \right)}}{{Ef}}$$

A 4 km optical link consists of multimode step index fiber with core refractive index of 1.3 and a relative refractive index difference of 1%. Find the delay difference between the slowest and fastest modes at the fiber output.

A

0.173 μsec

B

0.152 μsec

C

0.96 μsec

D

0.121 μsec

If the first two statements are true, the third statement is :
I. Oat cereal has more fiber than corn cereal but less fiber than bran cereal.
II. Corn cereal has more fiber than rice cereal but less fiber than wheat cereal.
III. Of the three kinds of cereal, rice cereal has the least amount of fiber.

A

true

B

false

C

[C. uncertain

Multimode graded index fibers with wavelength of 0.85μm have numerical aperture of 0.29 have core/cladding diameter of ___________

A

62.5 μm/125 μm

B

100 μm/140 μm

C

85 μm/125 μm

D

50 μm/125μm

The following items consist of two statements, one labeled as “Assertion (A)” and the other labeled as the “Reason (R)”. You are to examine the two statements carefully and decide if the Assertion (A) and the Reason (R) are individually true and if so whether the reason is a correct explanation of the assertion. Select your answer to these items using the codes given below and mark your answer accordingly. Assertion (A): Polarization preserving fibers have a special core design that maintains the state of polarization. Reason (R): In polarization preserving fibers, there is a stress applying part, which creates slow and fast axes in the core.

A

Both (A) and (R) are true and (R) is the correct explanation of (A).

B

Both (A) and (R) are true, but (R) is not the correct explanation of (A)

C

(A) is true, but (R) is false.

D

(A) false, but (R) is true.

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)

A

34 dB

B

32.59 dB

C

42 dB

D

33.1 dB

The concentricity errors between the fiber core and the outside diameter of the jeweled ferrule are in the range of ___________ with multimode step-index fibers.

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