Compare this strategy with wdm on the next slide we

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(Compare this strategy with WDM) On the next slide we show an example of TDM for 4 independent channels (channels A, B, C, and D). Each word contains 8 bits.
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Dr. Joseph C. Palais 10.4 26 1 0 1 1 0 0 1 1 0 0 1 0 1 0 1 0 Ch. A Ch. B Ch. D Frame Fiber Ex. Consider a fiber T3 telephone line R = 44.736 Mbps For digitized voice we require: 64,000 bps = 64 kbps = 0.064 Mbps Ch. C
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Dr. Joseph C. Palais 10.4 27 How many phone calls can we transmit on this line using TDM? Solution: (44.736 Mbps) / (0.064 Mbps/channel) = 699 voice channels Normally 672 voice calls are transmitted. The extra bits are used for synchronization, signaling, and other overhead needs.
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Dr. Joseph C. Palais 10.4 28 SONET (Synchronous Optical Network) is the international standard. Some of the SONET standard line rates are shown on the next slide.
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Dr. Joseph C. Palais 10.4 29 Designation Data Rate Voice (Mbps) Channels OC-1 51.84 672 OC-3 155.52 2,016 OC-12 622.08 8,064 OC-24 1,244.16 16,128 OC-48 2,488.32 32,256 OC-192 9,953.28 129,024 OC-768 39,813.12 516,096
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Dr. Joseph C. Palais 10.4 30 10.4.4 Time Division Multiplexing (Optical Domain) TDM involves interleaving the bits associated with independent channels of information. 1.Why do it in the optical domain? Electrical multiplexers operating above 10 Gb/s are difficult to design. 2. Can we do this in the optical domain? Yes. How? See the next set of slides.
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Dr. Joseph C. Palais 10.4 31 LASER SPLITTER M M M D D D COMBINER FIBER n 1 ELECTRICAL MESSAGES FROM THE n CHANNELS MODULATED OPTICAL SIGNALS D M M: external modulator D: delay line Optical Time-Division Multiplexing
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Dr. Joseph C. Palais 10.4 32 LASER OTDM PULSE STREAM (ch1) (ch2) (ch3) (a) (ch1) (ch2) (ch3) (b) (c) (d) (e) (f) (g) (h) (i) OTDM Pulse Generation, Modulation, Multiplexing
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  • Fall '10
  • Palais
  • JOSEPH C. PALAIS, dr. joseph c., Dr. JOSEPH C. PALAIS

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