Conclusions » History » Version 15

HAENNIG, Gerald, 12/15/2015 11:17 AM

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h1. 5. Conclusions
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h2. 5.1 Simplified optical link model for transmission of a carrier
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The model is based on the Spurious Free Dynamic Range graph :
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p=. !{width:700px}SFDR.png!
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Figure 2. RF frequency respone (for several RF input powers).
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Thanks to this graph, it is possible for a given RF input power to determine :
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# RF output power and related gain ;
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# Output noise ;
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# 3rd order intermodulation products.
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It is possible to calculate Carrier to Noise, Carrier to Intermodulation and Carrier to Noise & Intermodulation ratio.
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h2. 5.2 Link comparison : Optical link vs Coaxial Cable for 30 m link length (like in a home)
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In the following table, there is a comparison between coaxial cable to optical link.
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|_. Parameter|_. Coaxial Cable|_. Optical Link |
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|RF Gain @ 950 MHz [dB]|-3.6 |+0.5|
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|RF Gain @ 2150 MHz [dB]|-5.6|+3.0|
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|Noise Figure @ 950 MHz [dB]|+3.6|+30|
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|Noise Figure @ 2150 MHz|+5.6|+33|
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|IIP3 [dBm]|+50 |+10|
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|SFDR [dB/Hz2/3]|+145|+102|
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|LNB remote supply|Yes, supplied through coaxial cable|No, supply close to antenna for OTX required|
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|Current Consumption [mA]|0|700 mA / 12 V|
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|LNB telecommand|Yes|No|
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|Bidirectional link|Yes|Yes, but with additional hardware|
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|Cost|Low|High|
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For a distance of 30 m, optical link is not justified : performances and cost are not competitive with coaxial cable.