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EE 233. LIGHTWAVESYSTEMS

Chapter 8B. MultichannelSystems[subcarrier mux]

Instructor:Ivan P. Kaminow

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SUBCARRIERMULTIPLEXING;

HYBRID FIBER COAX(HFC)

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HFC

• Hybrid Fiber-Coax Network: Comcast• MSO = multiple service operator = cable

service provider• CATV = community antenna TV = cable

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Coax to HFC

HEHE

X-L LU

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Coax to HFC

HEHE

FN

FN

FN

Increase transport capability Improve quality and reliability

Challenge for linear lightwave

X-L LU

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CABLE SPECTRUM

• 5 - 42 MHz: upstream applications• 50 - 500 MHz: downstream analog

apps• 550 - 1000+ MHz: emerging digital

apps• 6 MHz subcarrier channel spacing

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AGRAWAL

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PHILLIPS& DARCIE

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PHILLIPS &DARCIE

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X-L LU &SNEIZKO

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X-L LU &SNEIZKO

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PHILLIPS &DARCIE

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CHALLENGES OF AM-VSBTRANSMISSION

XTR RCV

Requirements:

CNR 52dB 47dB

CTB/CSO -65dBc -55dBc

Challenges:

- Linearity - Dispersion - Linearity- Noise - Reflection - Noise- Chirp - Others

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Desurvire

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Desurvire

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DESURVIRE

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The End