OCN-U2-Q6

1.1. What is intermodal dispersion?

• A) The spreading of light pulses due to multiple reflection paths in a fiber

• B) The scattering of light in different wavelengths

• C) The absorption of light within an optical fiber

• D) The compression of a light pulse as it travels

2. In which type of optical fiber does intermodal dispersion primarily occur?

• A) Single-mode fiber

• B) Multimode fiber

• C) Plastic optical fiber

• D) None of the above

3. How does intermodal dispersion affect signal transmission in optical fibers?

• A) It increases the power of the transmitted signal

• B) It compresses the signal, making transmission faster

• C) It causes signal broadening, leading to lower transmission speeds

• D) It eliminates signal interference

4. Which of the following best describes how intermodal dispersion occurs in multimode fibers?

• A) Different modes travel different distances within the fiber, causing signal distortion

• B) All modes travel at the same speed

• C) Light is absorbed by the core of the fiber

• D) Reflection from the cladding causes a delay in signal transmission

5. What is the main consequence of intermodal dispersion in optical communication systems?

• • A) Increased power consumption

• B) Limited bandwidth

• C) Increased data transmission rate

• D) Improved signal quality

6. Which of the following methods can reduce intermodal dispersion?

• A) Using multimode fibers with a larger core diameter

• B) Increasing the wavelength of the transmitted signal

• C) Using single-mode fibers instead of multimode fibers

• D) Reducing the input power to the optical fiber

7. Which characteristic of an optical fiber most influences the amount of intermodal dispersion?

• A) The refractive index of the cladding

• B) The wavelength of the light source

• C) The core diameter of the fiber

• D) The attenuation coefficient

8. How does graded-index multimode fiber reduce intermodal dispersion compared to step-index multimode fiber?

• A) By eliminating all dispersion

• B) By providing a smoother refractive index profile that equalizes the travel time of modes

• C) By increasing the number of light modes

• D) By amplifying the signal as it travels

9. What is the typical range of core diameters for multimode fibers where intermodal dispersion is significant?

• A) 2-8 micrometers

• B) 8-10 micrometers

• C) 50-62.5 micrometers

• D) 100-150 micrometers

10. In high-speed communication systems, why is single-mode fiber preferred over multimode fiber with respect to dispersion?

• A) Single-mode fibers allow multiple paths, reducing the delay

• B) Single-mode fibers eliminate intermodal dispersion, allowing for higher data rates

• C) Single-mode fibers scatter light more efficiently

• D) Single-mode fibers are less expensive than multimode fibers