Ch9Sec6 - THE FIBER FORUM Fiber Optic Communications...

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Dr. Joseph C. Palais 9.6 1 THE FIBER FORUM Fiber Optic Communications Dr. JOSEPH C. PALAIS PRESENTED BY
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Dr. Joseph C. Palais 9.6 2 Section 9.6 Wavelength-Division Multiplexing (WDM)
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Dr. Joseph C. Palais 9.6 3 WDM: Simultaneous transmission of several independent optical carriers along a single fiber. DWDM: Dense wavelength-division multiplexing has a large number of optical carriers. Fiber Multiplexer Demultiplexer Input Output λ 1 λ 4 λ 3 λ 2 λ 1 λ 4 λ 3 λ 2 λ 1 , λ 2 , λ 3 , λ 4
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Dr. Joseph C. Palais 9.6 4 Advantages of WDM 1. The total channel capacity is increased using WDM by the number of carriers. 2. Bi-directional operation is possible. 3. Fiber systems installed at an earlier time can be upgraded to a higher capacity using WDM. 4. A WDM system can transmit voice, video and data on separate wavelengths.
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Dr. Joseph C. Palais 9.6 5 9.6.1 Wavelength-Division Multiplexing Basics Loss curves for a multiplexer/demultiplexer look like: Ch. 1 Ch. 2 Ch. 3 0 -30 -15 1530 1534 1538 L (dB) λ (nm) The experiment for measuring this characteristic appears on the next slide.
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Dr. Joseph C. Palais 9.6 6 λ n Input Demultiplexer Output Ch. 2 Ch. 3 Ch. 4 Ch. 5 To obtain the demultiplexer characteristic, vary the input wavelength and measure the power emerging from each channel on the right. Ch. 1
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Dr. Joseph C. Palais 9.6 7 λ n Output Multiplexer Input Ch. 2 Ch. 3 Ch. 4 Ch. 5 To obtain the multiplexer characteristic, reverse the procedure, with inputs from the right. Ch. 1
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Dr. Joseph C. Palais 9.6 8 Example: If the source wavelengths are 1530, 1534, 1538 nm and the source linewidths are ∆λ < 2 nm Then, the insertion is (from the previous plot): L IL = 2 dB and the crosstalk is L CT >> 30 dB
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Dr. Joseph C. Palais 9.6 9 Conclusions: 1. For a good WDM system we require narrow linewidth light sources and 2. Sources having stable center wavelengths 3. Multiplexers/demultiplexers are narrow bandpass filters.
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Dr. Joseph C. Palais
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