Class 11 Telecom Chapter 3 Installation of optical Fiber Cable (OFC)

Class 11 Telecom Chapter 3 Installation of optical Fiber Cable (OFC) Solutions English Medium As Per AHSEC New Syllabus to each chapter is provided in the list so that you can easily browse through different chapters Class 11 Telecom Chapter 3 Installation of optical Fiber Cable (OFC) Question Answer and select need one. Class 11 Telecom Chapter 3 Installation of optical Fiber Cable (OFC) Notes Download PDF. AHSEC Class 11 Elective Telecom Question Answer English Medium.

Class 11 Telecom Chapter 3 Installation of optical Fiber Cable (OFC)

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Installation of optical Fiber Cable (OFC)

Chapter: 3

SESSION 1: PRE-INSTALLATION TESTING OF OPTICAL FIBER CABLES

CHECK YOUR PROGRESS

A. Multiple Choice Questions:

1. Which of the following define test equipment?

(a) Testing a device.

(b) Measuring a device.

(c) Testing fiber.

(d) Measuring fiber.

Ans: (b) Measuring a device.

2. Optical test equipment are the devices used to check_______.

(a) Light propagation.

(b) Losses.

(c) Splice.

(d) Reflection.

Ans: (b) Losses.

3. Optical Power can be measured by using_________.

(a) Optical Power meter.

(b) OTDR.

(c) Test fiber box.

(d) Optical Coupler.

Ans: (a) Optical Power meter.

4. OTDR stands for_________.

(a) Optic time depart reflector.

(b) Optical time domain reflector.

(c) Optical time domain reflectometer.

(d) Optical time depart reflector.

Ans: (c) Optical time domain reflectometer.

5. OTDR screen has X-axis and Y-axis______________.

(a) The X-axis measures distance and Y-axis measures attenuation.

(b) The X-axis measures attenuation and Y-axis measures distance.

(c) The X-axis measures time and Y-axis measures attenuation.

(d) The X-axis measures distance and Y-axis measures time.

Ans: (a) The X-axis measures distance and Y-axis measures attenuation.

6. Optical power meter can be operated in the wavelength of_________.

(a) 450nm.

(b) 1300nm.

(c) 1490nm.

(d) 1550nm.

Ans: (d) 1550nm.

7. The slope of the fiber trace shows__________.

(a) The attenuation coefficient of the fiber is calibrated in dB/km.

(b) The attenuation of the fiber is calibrated in dB/km.

(c) The attenuation coefficient of the fiber is calibrated in dB.

(d) The reflection coefficient of the fiber and is calibrated in dB/km.

Ans: (a) The attenuation coefficient of the fiber is calibrated in dB/km.

8. LASER produces________.

(a) Focused beam of light.

(b) Unfocused beam of light.

(c) Focused beam of electrons.

(d) Unfocused beam of electrons.

Ans: (a) Focused beam of light.

9. Fresnel reflections cause a vital OTDR specification referred to as__________.

(a) Dead zones.

(b) Live zone.

(c) Test zone.

(d) Neutral zone.

Ans: (a) Dead zones.

B. True or False:

1. Mini OTDRs are not portable and designed for field testing.

Ans: False.

2. PC-based OTDRs can be connected to the personal computer.

Ans: True.

3. OTDR test setups are generally used for testing the signal with a launch cable and hence use a receive cable.

Ans: True.

4. The optical power meter consists of two ports. One port can be joined to a reflectometer to measure power and another slot is connected to the light source.

Ans: False.

5. The slope of the fiber trace shows the attenuation coefficient of the fiber and is calibrated in dB.

Ans: False.

6. OCWR stands for Optical Continuous Wave Reflectometer.

Ans: True.

7. OTDR equipment is not able to sustain extreme environmental conditions like temperature, humidity etc.

Ans: False.

C. Short Answer Questions:

1. What do you mean by test equipment?

Ans: Tools and equipment play a crucial role in the optical fiber installation. Various tools and equipment used for the installation of optical fiber cable in the network are optical fiber stripper, scissors, cleaver, v-groove, screwdriver kit, crimping tool kit, etc.

2. What is OTDR?

Ans: Optical time domain reflectometer is an equipment used to measure the amount of reflection made in the optical fiber cable. It also assists in calculating the loss in optical fiber cable.

3. What is a power meter?

Ans: Optical power meter is a measuring equipment, which measures the power value of light, which is transferred via optical fiber cable.

4. What do you mean by dead zone?

Ans: A region on an OTDR trace after a strong reflection where the detector saturates and nearby events cannot be resolved (event dead zone / attenuation dead zone).

5. What do OTDRs test?

Ans: Fiber link characteristics distance to events, splice/connector loss, reflectance, attenuation (dB/km), and total fiber length; they help locate faults and breaks.

6. When do I need to use a launch cord (cable) with my OTDR?

Ans: OTDR Test set up is generally used for testing the signal with a launch cable and hence use a receive cable.

7. Difference between OTDR and power meter.

Ans: (i) Optical time domain reflectometer (OTDR): Measuring the amount of energy that is reflected back.

(ii) Optical power meter: Measuring equipment, which measures the power value of light.

8. Draw and explain block diagrams of OTDR.

Ans: 

Typical blocks: Pulse/laser source → optical coupler/splitter → test port → fiber under test; return path → coupler → photodetector (APD) → amplifier/ADC → timing/control (processor) → display. The source sends pulses; backscatter/reflective returns are timed and converted to distance and loss on the trace.

9. What does an OTDR measure?

Ans: An OTDR measures the amount of energy that is reflected back.

10. How are faults in cable detected?

Ans: The OTDR is a troubleshooting device that can pinpoint faults throughout a fiber optic link.

11. What is backscattering?

Ans: The redirection of light caused by atomic structures and particles along the light’s path.

12. Which solution is used to clean the connector?

Ans: This fast-acting cleaner Alcohol can be used with dry fiber wipes or tissues. It is used with the tissue paper to clean the bare fiber.

13. Name the types of OTDR available in the market.

Ans: Handheld/mini (field), PC-based, benchtop/lab, modular platform; by fiber type: single-mode and multimode; specialized variants for PON/FTTH/CWDM applications.

SESSION 2: SPLICING

CHECK YOUR PROGRESS

A. Multiple Choice Questions:

1. A permanent joint formed between two different optical fibers is known as a_____________.

(a) Fiber splicing.

(b) Fiber connector.

(c) Fiber attenuator.

(d) Fiber dispersion.

Ans: (a) Fiber splicing.

2. Which of the following is a major part of fusion splicing?

(a) Electric Arc.

(b) Heating.

(c) Fusion.

(d) All of the above.

Ans: (d) All of the above.

3. Which of the following defines the term cleaving?

(a) Cutting the fiber edges.

(b) Polishing the fiber ends.

(c) Cleaning the fiber.

(d) All of above.

Ans: (a) Cutting the fiber edges.

4. The loss of light in fusion splicing compared to mechanical splicing is___________.

(a) Equal.

(b) Greater.

(c) Less.

(d) None of above.

Ans: (c) Less.

5. Mechanical splicing is also known as____________.

(a) V-Groove splice.

(b) Elastic tube splice.

(c) Rotary splice.

(d) Both a and b.

Ans: (d) Both a and b.

6. Which of the following joint can be formed using mechanical splicing?

(a) Temporary joints.

(b) Permanent joints.

(c) Loosely joined.

(d) Partially joined.

Ans: (a) Temporary joints.

7. Comparing mechanical and fusion splicing we see___________.

(a) Fusion splicing is more accurate than mechanical splicing.

(b) Mechanical splicing is more accurate than fusion splicing.

(c) Both mechanical and fusion splice are accurate.

(d) Mechanical splicing and fusion splicing are inaccurate.

Ans: (a) Fusion splicing is more accurate than mechanical splicing.

8. Which of the following is responsible for core diameter mismatch loss?

(a) The diameter of the transmitting core is greater than that of the receiving core.

(b) The diameter of the transmitting core is less than that of the receiving core.

(c) The diameter of the transmitting core is not precisely aligned with the diameter of the receiving core.

(d) The diameter of the receiving core is at the low end of the acceptable size range.

Ans: (a) The diameter of the transmitting core is greater than that of the receiving core.

9. Which of the following is responsible for core cladding diameter mismatch loss?

(a) The cladding diameter of the transmitting fiber is larger than the cladding of the receiving fiber.

(b) The cladding diameter of the transmitting fiber is smaller than the cladding of the receiving fiber.

(c) The cladding diameters of the fibers do not match.

(d) The cladding diameters of both fibers are slightly larger than normal.

Ans: (c) The cladding diameters of the fibers do not match.

10. Which of the following loss, if there is a mismatch between the cores of two fibers.

(a) Concentricity loss.

(b) Centrality loss.

(c) Lateral offset loss.

(d) Slip loss.

Ans: (c) Lateral offset loss.

11. If the transmitting and receiving cores are slightly oval, the splice may experience.

(a) Symmetrical loss.

(b) Asymmetrical loss.

(c) Oval loss.

(d) None of the above.

Ans: (b) Asymmetrical loss.

SESSION 3: INDOOR OPTICAL FIBER INSTALLATION

CHECK YOUR PROGRESS

SESSION 4: LINK PERFORMANCE ANALYSIS

CHECK YOUR PROGRESS