CTS-Session-02A-Cbls - Session 02-A Optical Fiber...

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Session 02-A ptical Fiber Classification Optical Fiber Classification LT/CTS-02A/1009 1of34
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References Main Reference: h a p t e r 458 Chapter 4, 5, 8 LT/CTS-02A/1009 2of34
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Fiber Classification asic concept for classification Basic concept for classification Light Guiding Requirements arameters Parameters Modes LT/CTS-02A/1009 3of34
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General Light Guiding Requirements Total internal reflection is only a rough approximation of light guiding in optical fibers. Fiber is a waveguide and light is EM wave with frequency in the optical range. A waveguide guides wave in a pattern called modes. Modes are the energy distribution across it. he pattern depends on the wavelength and refractive The pattern depends on the wavelength and refractive index of the fiber (core). The variations in refractive index create boundary conditions that shapes how EM waves travel through the fiber. LT/CTS-02A/1009 4of34
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General Light Guiding Requirements For transmission the number of modes is important. It is easier to get light into a large fiber that supports many modes. Small fiber supports only single mode. LT/CTS-02A/1009 5of34
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Fiber Parameters Key parameters affecting fiber properties: ± Core-Cladding structure ± Size and Interface nature ± Glass composition ± Fiber attenuation and Pulse spreading ± Interface structure of core-cladding: ± Step Index ± raded Index Graded Index LT/CTS-02A/1009 6of34
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Major Fiber Properties ± Major fiber properties ± Attenuation as a function of wavelength. ollection of light into fiber (coupling) ± Collection of light into fiber (coupling). ± Transmission modes. ± Transmission capacity and pulse spreading. ± Operating Wavelength. ± Tolerances for splicing, connecting, temperature, abuse. ± Cost. LT/CTS-02A/1009 7of34
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Types of Optical Fiber Multi Mode ± tep Index Step Index ± Graded Index Single Mode ispersion Shifted ± Dispersion Shifted ± Zero Dispersion Shifted ± Non Zero Dispersion Shifted LT/CTS-02A/1009 8of34
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Types of Optical Fiber ommon Types: Common Types: Step Index Multimode 100/140, 200/240, 62.5 /125 Graded index 50/125 (ITU G.651) Non zero dipersion shifted single mode fiber (ITU G.655) Reduced core step Index. Step index multi mode fiber with total diameter of 140 μm and core of 100 μm can be used for ommunication communication. LT/CTS-02A/1009 9of34
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Types of Optical Fiber LT/CTS/1007 10 of 24
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Types of Optical Fiber LT/CTS/1007 11 of 24
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Types of Optical Fiber LT/CTS/1007 12 of 24
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Types of Optical Fiber Multi Mode ± ropagates more than one mode of ght. Propagates more than one mode of light. Single Mode ± Propagates only one mode of light. tep Index Step Index ± Only 2 layer of material of different refractive index with step profile. ± Propagation by total internal reflection.
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This note was uploaded on 11/14/2011 for the course COMPUTER E H0704 taught by Professor Lukas during the Spring '11 term at Bina Nusantara University.

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CTS-Session-02A-Cbls - Session 02-A Optical Fiber...

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