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Advancement > NEETS Mod 24 - Fiber Optics > Flashcards

NEETS Mod 24 - Fiber Optics Flashcards

Ace the exam

1
Q

What do Ray theory and Mode theory describe?

A

How light energy is transmitted along an optical fiber.

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2
Q

What is the basic optical material property that measures the speed of light in an optical medium?

A

Index of Refraction

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3
Q

Which law describes the relationship between the incident and the refracted Ray’s when light Ray’s encounter the boundary between two different transparent materials?

A

Snell’s Law of Refraction

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4
Q

What are the 3 basic parts of an optical fiber?

A

Core, Cladding, Coating (Buffer)

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5
Q

What are Meridional Rays?

A

Light rays that pass through the axis of the optical fiber.

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6
Q

What are Skew rays?

A

Light rays that propagate through an optical fiber without passing through the axis.

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7
Q

What are Bound rays?

A

Light rays which propagate through an optical fiber core by total internal reflection.

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8
Q

What are Unbound rays?

A

Light rays that refract out of the fiber core into the cladding and are eventually lost.

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9
Q

What is total internal reflection?

A

When light rays are totally reflected at the boundary between two different transparent materials.

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10
Q

What is the Critical Angle of Incidence?

A

The angle at which total internal reflection occurs.

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11
Q

What is acceptance angle?

A

The maximum angle to the axis of the fiber that light entering the fiber is bound or propagated.

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12
Q

What is the measurement of the ability of an optical fiber to capture light?

A

Numerical Aperture (NA)

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13
Q

What uses electromagnetic wave behavior to describe the propagation of light along an optical fiber?

A

Mode Theory

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14
Q

What are the two classifications of optical fibers?

A

Single mode and Multimode

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15
Q

Define attenuation.

A

Loss of optical power as light travels along an optical fiber.

*Caused by absorption, scattering, & bending losses

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16
Q

Define dispersion.

A

Spreading the optical pulse as it travels along the fiber. (Limits how fast information is transferred)

17
Q

What happens to light Ray’s when they encounter any substance?

A

Transmitted, Reflected, Refracted, or Absorbed.

18
Q

When does reflection occurs?

A

When a wave strikes an object and it bounces back toward the source.

19
Q

What is an incident wave?

A

The wave that from the source toward the object.

20
Q

What is the reflected wave?

A

The wave that moves away from the object.

21
Q

Define the Law of Reflection.

A

Law of Reflection states that the angle of incidence is equal to the angle of reflection.

22
Q

What is Refraction?

A

When a wave traveling through two different mediums passes through the boundary of the mediums and bends toward or away from the normal.

23
Q

What is the conversion of optical power into another energy form, such as heat?

A

Absorption

24
Q

What are the two types of absorption?

A

Intrinsic and Extrinsic

25
Q

What causes intrinsic absorption?

A

Basic fiber-material properties

26
Q

What causes Extrinsic absorption?

A

When impurities, such as Hydroxyl ions, are introduced into the fiber material.

27
Q

Which fibers are predominately used in fiber optic communication?

A

Silica fibers

28
Q

What is the Wavelength of Operation in fiber optics?

A

Between 700nm and 1600nm

29
Q

What is scattering?

A

Losses caused by the interaction of light with density fluctuations within a fiber.

30
Q

What is the main source of loss in commercial fibers operating between 700nm and 1600nm?

A

Rayleigh scattering

31
Q

What are the two types of dispersion?

A

Intramodal (Chromatic) and Intermodal (Modal)

32
Q

What is the term used for light travelling through different materials and different waveguide structures at different speeds?

A

Intramodal (Chromatic) dispersion

33
Q

True or False. Material dispersion is dependent on the light wavelengths interaction with the refractive index of the core.

A

True

34
Q

Why does Intermodal (Modal) dispersion occur?

A

Because each more travels a different distance over the same time span.

35
Q

What is the dominant source of dispersion in Multimode fibers?

A

Modal dispersion

36
Q

Which fiber mode exhibits the highest possible bandwidth?

A

Single mode

Advancement (2 decks)

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