Digital Modulation OntoAnalog TV Channels

RF Up-

Conversion

Up

Cnvrt

Simplified 64-QAM Transmitter

Data @ 27Mb/s

from Broadband

Switch

5Msymbols/s

@ 6 bits/s/Hz

64 Point QAM Constellation

Encoder

+

3

3

In-phase Amplitudes

I: 1 of 8

sin

cos

5 MHz

Q: 1 of 8

Quadrature

Amplitudes

~

I

Q

FEC

30Mb/s

If all channels are digital, this equates to ɰGb/s capacity per fiber! SONET OC-48 provides 2.4Gb/s, by comparison.

Amplitude (i.e.intensity) Modulating Laser at 1300nm or 1650nm

AM Fiber

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