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EEC_144_001 Assignment 3Chapter 3 Fiber-Optic CablePlease fi.docx
- 1. EEC_144_001 Assignment 3 Chapter 3 Fiber-Optic Cable Please fill in your name and MSU ID number. Student Name Student ID # 1) When compared to copper core cables, fiber-optic cables provide _____. (Select all that apply.) A. greater security B. complete immunity to electromagnetic interference C. greater bandwidth D. easier methods for connector installation E. complete immunity to attenuation Answer: 2) Fiber-optic is much more secure than copper core cable because _____. A. it uses a more complex encryption code for transmitted data B. it is virtually impossible to tap into without being detected C. its insulating jacket is too thick for normal data tapping devices D. data is transmitted at light speed, and is therefore undetectable to typical data snooping devices Answer: 3) The wavelength of a light wave _____. A. indicates the distance a light wave travels in one cycle B. is measured in feet C. indicates the number of light waves transmitted per second D. cannot be measured because it is invisible Answer:
- 2. 4) FDDI supports a maximum distance of _____meters. A. 300 B. 2,000 C. 10,000 D. 40,000 Answer: 5) Misalignment or other improper splicing of fiber-optic cable will cause _____. A. an open B. a short C. attenuation D. data corruption Answer: 6) Marks or scratches on the ends of the fiber-optic core material cause attenuation due to _____ and refraction. A. reflection B. dispersion C. extrinsic losses D. Scattering Answer: 1 3 Fiber-Optic Cable Fiber-Optic Cable
- 3. 2 Fiber-Optic Cable Total Internal Reflection n1sin(θ1) = n2sin(θ2) where: n1 is the refractive index of the medium the light is leaving θ1 is the incident angle between the light beam and the normal (normal is 90° to the interface between two materials) n2 is the refractive index of the material the light is entering θ2 is the refractive angle between the light ray and the normal 3 Total Internal Reflection
- 4. n1sin(θ1) = n2sin(θ2) Total Internal Reflection CH3CHOHCH2OH 44.35° Critical Angle = arcsin(1.0003/1.4310) n1sin(θ1) = n2sin(θ2) 4 Total Internal Reflection Ultra-pure glass (SiO2)Cladding Analog to Digital Signal 5 Analog to Digital Signal Analog to Digital Signal 6
- 5. Analog to Digital Signal Analog to Digital Signal 7 Characteristics of Fiber-Optic Cable ghtweight and small in diameter - and water-resistant than copper core cable The Nature of Light fied in the electromagnetic wave spectrum chart
- 6. wavelength 8 Electromagnetic Wave Spectrum Single-Mode Fiber-Optic Cable: 1310nm/1550nm Multimode Fiber-Optic Cable: 850nm/1300nm Fiber-Optic Cable Construction or plastic core surrounded by cladding tube or tight buffer Code (NEC) is referred to for
- 7. building specifications or standards 9 Attenuation in Fiber-Optic Cable Transmission —The loss of signal strength due to impurities in the core material. —The distortion of the light wave pattern as it reflects off the core cladding or in limiting length of fiber-optic cable; longer cable means more dispersion Attenuation in Fiber-Optic Cable Transmission —Signal losses caused by physical factors outside the normal core, such as splices, connectors, and bends in the fiber core
- 8. —A type of signal loss that commonly occurs at connection points in fiber- optic cabling and is due to refraction property differences in the core material, the connector materials used for sealing the connector, and air. 10 Fiber-Optic Cable Specifications -Optic Cable -Mode Fiber- Optic Cable Fiber-Optic Cable Specifications -Optic Cable -mode systems usually cost less. -mode, but still much greater than coaxial cable. 2
- 9. kilometers seems to be the maximum recommended distance. -mode bandwidth is smaller than single- mode—up to 1 GHz vs 100,000 GHz—but still enough transmit a large amount of A/V signal, data, or controls. 11 Fiber-Optic Cable Specifications -Mode Fiber-Optic Cable -mode cable than it does inside multi-mode. Single-mode signal can survive up to 30 kilometers. of single-mode is higher than multi-mode, as much as 100,000 GHz. -mode is so small (~9 microns), single-mode connectors must be kept
- 10. very, very clean. Even a microscopic particle blocking the pupil can partially or completely block signal. Fiber-Optic Cable Specifications -index multimode fiber-optic cable of core material. It is designed for maximum light conduction at the center of the core and gradually diminished light conduction toward the cladding. -index multimode fiber-optic cable 12 Fiber-Optic Cable Specifications (Cont.) IEEE 802.3 Standards 13 IEEE 802.3 Standards (Cont.) Fiber Distributed Data Interface (FDDI)
- 11. provides path for communication 14 FDDI Fault Tolerance Fiber-Optic Cable Connectors Fiber-Optic Cable Connector Description ST Round. Uses a push and twist connection SC Square. Uses retaining clips FC Round. Uses screw threads LC (single) Square. Small form factor. LC (duplex) Two single LC connectors held together with a clip MTRJ Incorporates two fiber-optic cores into one assembly 15
- 12. Fiber-Optic Cable Connectors (Cont.) Installing Fiber-Optic Cable Connectors connections require special equipment and techniques -optic cable: -optic cable is cut with a sharp cutting tool—it is not cleaved 16 Fusion Splice removed from cable end -optic core is cleaved, not cut through lted
- 13. together, covered, and crimped Fiber-Optic Cable Meters —Most commonly used meter for testing short runs in cable nd records the effects of attenuation faults in the cable and at its connections A https://www.youtube.com/watch?v=8VrG3YEm0yA 17 Questions?