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DWDM: New Way to Build Networks

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DWDM: New Way to Build Networks

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  1. DWDM: New Way to Build Networks David Devereaux-Weber

  2. Definition • Dense Wavelength Division Multiplexing permits multiple optical signals to travel on the same fiber at different optical wavelengths

  3. How Do We Use DWDM? • Purchase right to use (Indefeasible Right to Use or IRU) someone else's dark fiber - they maintain the jacket and own the fibers, you use the fiber. • Install your own fiber – you maintain the jacket and use the fiber.

  4. Why Use DWDM? • In high-bandwidth situations, using DWDM saves cost compared to using multiple fiber pairs. • Using optical amplification can extend the reach of an optical span, reducing or eliminating the need for electrical regeneration.

  5. Further DWDM Savings • Optical amplification can carry more than one optical bandwidth, sharing the cost of amplification over multiple circuits.

  6. Dim Fiber • In the dark fiber situation, you have access to the entire fiber and all the wavelengths it can carry; you furnish the DWDM equipment and the transport equipment for each wavelength. • If you only need one optical wavelength, the carrier owns the DWDM equipment, furnishes dim fiber to you

  7. Telecom Paradigm Shifts • Carriers moving from tariffed to non-tariffed services. • Price can drop more in non-tariffed environment. • Changing from circuit provider to fiber caretaker

  8. Datacom Paradigm Shifts • Reducing intermediate layers, like ATM, Frame Relay or SONET. • Reducing provisioning complexity