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This section includes 8 Mcqs, each offering curated multiple-choice questions to sharpen your Optical Communications knowledge and support exam preparation. Choose a topic below to get started.
1. |
The intrinsic loss through a multimode fiber joint is independent of direction of propagation. |
A. | True |
B. | False |
Answer» C. | |
2. |
In a single mode fiber, the losses due to lateral offset and angular misalignment are given by 0.20 dB and 0.46 dB respectively. Find the total insertion loss. |
A. | 0.66 dB |
B. | 0.26 dB |
C. | 0.38 dB |
D. | 0.40 dB |
Answer» B. 0.26 dB | |
3. |
Determine coupling efficiency if the misalignment loss in a graded index fiber is 0.102. |
A. | 0.136 |
B. | 0.898 |
C. | 0.982 |
D. | 0.684 |
Answer» C. 0.982 | |
4. |
A graded index fiber has a parabolic refractive index profile ( =2) and core diameter of 42 m. Estimate an insertion loss due to a 2 m lateral misalignment when there is index matching and assuming there is uniform illumination of all guided modes only. |
A. | 0.180 |
B. | 0.106 |
C. | 0.280 |
D. | 0.080 |
Answer» E. | |
5. |
Losses caused by factors such as core-cladding diameter, numerical aperture, relative refractive index differences, different refractive index profiles, fiber faults are known as ____________ |
A. | Intrinsic joint losses |
B. | Extrinsic losses |
C. | Insertion losses |
D. | Coupling losses |
Answer» B. Extrinsic losses | |
6. |
Two joined graded index fibers that are perfectly aligned have refractive indices R = 1.93 for receiving fiber E = 2.15 for emitting fiber. Calculate the coupling loss. |
A. | 0.23 dB |
B. | 0.16 dB |
C. | 0.82 dB |
D. | 0.76 dB |
Answer» B. 0.16 dB | |
7. |
The ratio r = (n1 n)/(n1 n) indicates ____________ |
A. | Fresnel reflection |
B. | Reflection coefficient |
C. | Refraction coefficient |
D. | Angular power distribution coefficient |
Answer» C. Refraction coefficient | |
8. |
A measure of amount of optical fiber emitted from source that can be coupled into a fiber is termed as ______________ |
A. | Radiance |
B. | Angular power distribution |
C. | Coupling efficiency |
D. | Power-launching |
Answer» D. Power-launching | |