Transmission Line Parameters Quiz
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Questions and Answers

What is the formula for group velocity and phase velocity?

  • $v_g = c/\sqrt{1 - (2a)}$, $v_p = c/\sqrt{1 - (fc)}$
  • $v_g = c\sqrt{1 - (2a)}$, $v_p = c\sqrt{1 - (fc)}$
  • $v_g = c/2$, $v_p = f^2$
  • $v_g = c$, $v_p = f\lambda$ (correct)

    • What does the cutoff frequency represent in waveguide theory?

  • The frequency at which the phase velocity equals the speed of light.
  • The frequency at which the group velocity becomes half of the speed of light.
  • The frequency at which no higher modes can propagate through the waveguide. (correct)
  • The frequency at which light enters the waveguide.

    • What is the characteristic impedance of a waveguide?

  • $377 \sqrt{1-(fc)}$ (correct)
  • $377\sqrt{1-( \lambda ) / 2a}$
  • $377 / 2 \sqrt{1-(fc)}$
  • $377 / 2 \sqrt{1-( \lambda ) / 2a}$

    • What are the key components of an optical fiber?

    <p>Core, Cladding, Coating, Buffer (A)</p> Signup and view all the answers

    In optical fiber systems, what type of transmission is more common?

    <p>Digital transmission (B)</p> Signup and view all the answers

    In which band do optical fiber systems generally operate?

    <p>Infrared band (C)</p> Signup and view all the answers

    What is the velocity factor?

    <p>The ratio of the actual velocity of propagation through a vacuum to the speed of light (D)</p> Signup and view all the answers

    What is the characteristic impedance (Zo) of an infinitely long transmission line at radio frequencies?

    <p>Resistive and equal to Zo (C)</p> Signup and view all the answers

    What type of transmission line is described as nonresonant?

    <p>A line where electromagnetic waves travel without reflections (B)</p> Signup and view all the answers

    What is the relationship between voltage and current at any point along a nonresonant transmission line?

    <p>The voltage and current are in phase, and their ratio is equal to Zo (D)</p> Signup and view all the answers

    What is the propagation delay in networking applications?

    <p>The time required for a signal to travel from one end of a circuit to the other (A)</p> Signup and view all the answers

    Which statement about line losses on a nonresonant transmission line is true?

    <p>Line losses are minimum per unit length (A)</p> Signup and view all the answers

    What advantage do laser diodes have over LEDs in terms of light production?

    <p>Producing light in a narrow cone suitable for optical fiber coupling (B)</p> Signup and view all the answers

    Why are laser diodes more difficult to operate compared to LEDs?

    <p>Their current must be carefully controlled (B)</p> Signup and view all the answers

    How are lasers usually modulated?

    <p>By changing the current from just below lasing threshold to a higher value (B)</p> Signup and view all the answers

    Which of the following is true about single-mode fiber?

    <p>It has a small core diameter to support only the axial mode. (C)</p> Signup and view all the answers

    Which type of practical light detector is commonly used in fiberoptic communications receivers?

    <p>PIN Diodes (A)</p> Signup and view all the answers

    What is the advantage of multimode graded index fiber over multimode step index fiber?

    <p>It minimizes modal dispersion by varying the refractive index of the core. (D)</p> Signup and view all the answers

    Which type of fiber optic cable has higher order modes?

    <p>Both multimode step index and multimode graded index fibers (D)</p> Signup and view all the answers

    What determines the responsivity of an optical detector?

    <p>The output photocurrent (A)</p> Signup and view all the answers

    What materials are commonly used in optical detectors for different wavelengths in fiberoptic communications?

    <p>Si, GaAs, Ge, InP, InGaAs (D)</p> Signup and view all the answers

    Which component of a fiber optic system is typically more expensive for multimode fiber compared to single-mode fiber?

    <p>The transmitter and receiver equipment (D)</p> Signup and view all the answers

    What is the primary cause of higher attenuation in multimode fibers compared to single-mode fibers?

    <p>The increased scattering of light due to dopants in the glass (C)</p> Signup and view all the answers

    Which factor does the attenuation of light through glass depend on?

    <p>The wavelength of light (B)</p> Signup and view all the answers

    Which of the following is NOT a typical loss in optical fiber links?

    <p>Amplifier losses (A)</p> Signup and view all the answers

    What is the purpose of a link budget calculation in fiber optic communication systems?

    <p>To assess the overall performance and reliability of the system (A)</p> Signup and view all the answers

    Which of the following losses is NOT included in a link budget calculation?

    <p>Amplifier gain (B)</p> Signup and view all the answers

    What is the term used to describe the excess power remaining after accounting for all losses in a link budget calculation?

    <p>System margin (D)</p> Signup and view all the answers

    Which of the following is NOT a type of FTTX architecture mentioned in the text?

    <p>Fiber to the building (FTTB) (C)</p> Signup and view all the answers

    What is the simplest way to prepare a loss budget, according to the text?

    <p>Start with the transmitter power in dBm, subtract all losses in decibels, and compare the result with the required power at the receiver (D)</p> Signup and view all the answers

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