Tín hiệu và Hệ thống - Cấu tạo và truyền sóng sợi quang
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Questions and Answers

Hng s lan truyn ca mode trong si quang c k hiu bng g?

  • (correct)
  • k
  • M
  • V

    • Bc sng ct ca mt mode l g?

  • Bc sng m ti hng s lan truyn b bng 0 (correct)
  • Bc sng do ct li v v ca si quang to ra
  • Bc sng c cng sut ln nht
  • Bc sng cho tn hiu truyn dn ngoi v

    • Cng thc xc nh hng s lan truyn b cho cc mode LP l g?

  • (2.11)
  • (2.7)
  • (2.8)
  • (2.6) (correct)

    • Si quang a mode chit sut bc (MM-SI) truyn nhiu loi tia sng, bao gm tia no?

    <p>Tia kinh tuyn v tia nghing</p> Signup and view all the answers

    Mt ct chit sut ca si quang a mode chit bin i (MM-GI) c dng nh th no?

    <p>ng cong hnh sin</p> Signup and view all the answers

    Khi nim 'khu s' trong si quang a mode chit bin i l g?

    <p>S lng mode truyn qua mi n v bng tn</p> Signup and view all the answers

    Iu kin si quang ch truyn mt mode duy nht l g?

    <p>$V &lt; 2.405$</p> Signup and view all the answers

    What is the formula used to determine the normalized propagation constant, $b$, for different LP modes in an optical fiber?

    <p>$b = f(V)$</p> Signup and view all the answers

    What is the definition of the cutoff wavelength for a particular mode in an optical fiber?

    <p>The wavelength at which the normalized propagation constant, $b$, is equal to 0.</p> Signup and view all the answers

    What is the approximate total average power in the cladding of a multimode optical fiber?

    <p>$P_c = \pi^2M/8$</p> Signup and view all the answers

    What is the cross-sectional refractive index profile of a graded-index multimode (MM-GI) optical fiber?

    <p>Parabolic</p> Signup and view all the answers

    What is the definition of the numerical aperture (NA) for a graded-index multimode (MM-GI) optical fiber?

    <p>$NA = \sqrt{2g(n_1^2 - n_2^2)}$</p> Signup and view all the answers

    What is the condition for single-mode operation in an optical fiber?

    <p>$V &lt; 2.405$</p> Signup and view all the answers

    What are the two types of rays that propagate in a step-index multimode (MM-SI) optical fiber?

    <p>Meridional and skew rays</p> Signup and view all the answers

    How does the mode dispersion affect the transmission bandwidth of a multimode optical fiber?

    <p>Decreases the transmission bandwidth</p> Signup and view all the answers

    What is the relationship between the normalized propagation constant, $b$, and the power distribution in the core and cladding of an optical fiber?

    <p>As $b$ approaches the cutoff value, more power is confined in the cladding.</p> Signup and view all the answers

    What is the primary difference between the ray propagation in step-index multimode (MM-SI) and graded-index multimode (MM-GI) optical fibers?

    <p>The ray paths are straight in MM-SI and curved in MM-GI.</p> Signup and view all the answers

    How does the mode dispersion affect the transmission bandwidth of a single-mode optical fiber?

    <p>Has no effect on the transmission bandwidth</p> Signup and view all the answers

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