History of Optical Fiber Communication Quiz and Flashcards

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Questions and Answers

What is the main subject of the text provided?

Fiber-Optic Applications

FTTH Technology (correct)

Operating Bands of Optical Fiber Communication

Optical Fiber Splicing

During which period did the Greeks use fire and smoke signals for sending information?

800 B.C. (correct)

18th Century A.D.

Second Century B.C.

End of the 18th Century A.D.

What is the primary purpose of signaling lamps mentioned in the text?

Conveying only one type of signal

Encoding optical signals (correct)

Development of optical communication

Transmission of multiple types of signals

Which part of an optical fiber is responsible for the transmission of light signals?

Core Signup and view all the answers

What is the theory behind the operation of an optical fiber communication system?

Principle of Operation – Theory Signup and view all the answers

What is the spectral operating region for eribium doped optical fiber amplifiers?

C-band Signup and view all the answers

Which type of fiber has a lower PMD value of 0.2 ps√km?

G.655c Signup and view all the answers

What is the main advantage of G.ITU-T G.657 Compliant Bend Insensitive fiber?

Suitable for FTTH applications Signup and view all the answers

Which version of G.655 fibers was introduced to extend WDM application into the S-band?

G.655b Signup and view all the answers

What wavelength range does G.656 compliant low slope dispersion non-zero dispersion shifted fiber operate in?

1460 to 1625 nm Signup and view all the answers

What has led to the increased use of optical fibre as a transmission media?

Decreased cost, improved technology in multiplexing, high capacity, and immunity to electro-magnetic interference Signup and view all the answers

What is a key factor contributing to optical fibre's increased bandwidth requirement from 20Kbps to around 1Gbps?

Convergence of access networks with IP & MPLS technologies Signup and view all the answers

In the context of optical fibre technology, what is the significance of the migration from TDM and FDM to packet-based statistical multiplexing?

Improved efficiency in data transmission Signup and view all the answers

What capabilities do modern client terminals in optical fibre networks possess?

Voice, video, text, web, and multimedia capabilities Signup and view all the answers

How are human interfaces improving in optical fibre technology?

Incorporating signals from sensory organs like touch, vision, and mind Signup and view all the answers

What type of fiber has a narrow core and allows light to travel parallel to the axis?

Single-mode fiber Signup and view all the answers

In which type of cable is the buffering material in direct contact with the fiber?

Tight Buffer Tube Cable Signup and view all the answers

Which type of cable design is primarily used in outside-plant installations?

Loose Buffer Tube Cable Signup and view all the answers

What is the main advantage of single-mode fiber over multimode fiber?

Less dispersion Signup and view all the answers

For what purpose are single-fiber tight-buffered cables commonly used?

Terminating loose-tube cables Signup and view all the answers

What is the advantage of optical fiber communication in terms of bandwidth?

Higher bandwidth compared to radio wave and microwave frequency communication systems. Signup and view all the answers

Which of the following is NOT listed as an application of optical fiber in the provided text?

Mobile phone data transmission Signup and view all the answers

In optical fiber communication, what is the range of the optical carrier frequency?

$10^{13}$ to $10^{15}$ Hz Signup and view all the answers

What type of networks are mentioned in the text as utilizing optical fiber communication?

Both global networks and desktop computers Signup and view all the answers

Which of the following is NOT mentioned as an advantage of optical fiber communication?

Lower transmission bandwidth compared to radio waves Signup and view all the answers

What makes G.657A fibers suitable for installation at home and office?

Insensitivity to bends Signup and view all the answers

What is the difference between G.657A and G.657B fibers?

Bending radius Signup and view all the answers

In which environment was G.657A fiber specifically developed for use?

FTTH sites Signup and view all the answers

What type of cables are G.657.B fibers commonly used in?

Indoor fiber optic cables with field installable connectors Signup and view all the answers

What feature of ADSS cables makes them suitable for aerial applications?

They do not need a messenger to support them Signup and view all the answers

Why are optical fibers widely used in fiber-optic communications?

They experience less signal loss and are immune to electromagnetic interference. Signup and view all the answers

What was the capacity of each optical-fiber pair installed by Bell in downtown Chicago in May 1977?

672 voice channels Signup and view all the answers

What percentage of the world's long-distance voice and data traffic is currently carried over optical-fiber cables?

Approximately 80% Signup and view all the answers

Which characteristic of optical fibers makes them preferable over metal wires in communication?

Low signal loss and immunity to electromagnetic interference Signup and view all the answers

Why are optical fibers used for transmitting light between two ends in a communication system?

For their ability to act as waveguides and transmit light effectively Signup and view all the answers

Study Notes

Optical Fiber Communication

The ancient Greeks used fire and smoke signals for communication during the Greek period.

Optical Signaling

Signaling lamps were used to send information over short distances.

Optical Fiber Structure

The core of an optical fiber is responsible for transmitting light signals.

Optical Fiber Communication System

The system operates on the principle of total internal reflection, where light signals are transmitted through the core of the fiber.

Erbium Doped Fiber Amplifiers

These amplifiers operate in the spectral region of 1530-1560 nm.

Fiber Types

G.652 fibers have a higher PMD value compared to G.655 fibers, which have a lower PMD value of 0.2 ps√km.

G.655 Fibers

Version 3 of G.655 fibers was introduced to extend WDM application into the S-band.

G.656 Fibers

G.656 compliant low slope dispersion non-zero dispersion shifted fibers operate in the wavelength range of 1460-1625 nm.

Advantages of Optical Fiber

Increased use of optical fiber as a transmission media is due to its high bandwidth and low attenuation.
One key factor contributing to optical fibre's increased bandwidth requirement from 20Kbps to around 1Gbps is the need for higher data transfer rates.

Migration to Packet-Based Multiplexing

The migration from TDM and FDM to packet-based statistical multiplexing has increased the efficiency of optical fibre technology.

Modern Client Terminals

Modern client terminals in optical fibre networks possess high-speed processing capabilities and advanced interfaces.

Human Interfaces

Human interfaces are improving in optical fibre technology with advancements in accessibility and user experience.

Single-Mode Fiber

Single-mode fiber has a narrow core and allows light to travel parallel to the axis.

Cable Types

In loose-tube cables, the buffering material is not in direct contact with the fiber.
Tight-buffered cables are commonly used for indoor applications, while loose-tube cables are used for outdoor applications.

Single-Fiber Tight-Buffered Cables

These cables are commonly used for indoor applications, such as in commercial or residential buildings.

Advantages of Single-Mode Fiber

Single-mode fiber has a higher bandwidth and lower attenuation compared to multimode fiber.

Optical Fiber Communication Advantages

Optical fiber communication offers high bandwidth, low attenuation, and high security.

Optical Fiber Applications

Optical fiber communication is used in telecommunication networks, cable television networks, and metropolitan area networks.
Not listed as an application of optical fiber is satellite communication.

Optical Carrier Frequency

The optical carrier frequency range is between 100 GHz to 400 THz.

G.657 Fibers

G.657A fibers are suitable for installation at home and office due to their small bend radius and resistance to bending.
G.657B fibers are used in outdoor applications such as in FTTx networks.
G.657A fibers were specifically developed for use in indoor and outdoor applications.

ADSS Cables

ADSS cables are suitable for aerial applications due to their all-dielectric self-supporting design.

Advantages of Optical Fibers

Optical fibers are widely used in fiber-optic communications due to their high bandwidth, low attenuation, and high security.
Optical fibers are preferable over metal wires due to their high bandwidth, low attenuation, and immunity to electromagnetic interference.