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

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

<p>$V &lt; 2.405$ (B)</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>$b = f(V)$ (B)</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. (A)</p> Signup and view all the answers

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

<p>$P_c = \pi^2M/8$ (C)</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 (B)</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>$NA = \sqrt{2g(n_1^2 - n_2^2)}$ (C)</p> Signup and view all the answers

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

<p>$V &lt; 2.405$ (D)</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 (B)</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 (D)</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. (B)</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. (D)</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 (A)</p> Signup and view all the answers

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