Transcript DWDM: New Way to Build Networks

DWDM: New Way to Build
Networks
David Devereaux-Weber
Definition
• Dense Wavelength Division Multiplexing
permits multiple optical signals to travel on
the same fiber at different optical
wavelengths
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.
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.
Further DWDM Savings
• Optical amplification can carry more than
one optical bandwidth, sharing the cost of
amplification over multiple circuits.
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
Telecom Paradigm Shifts
• Carriers moving from tariffed to nontariffed services.
• Price can drop more in non-tariffed
environment.
• Changing from circuit provider to fiber
caretaker
Datacom Paradigm Shifts
• Reducing intermediate layers, like ATM,
Frame Relay or SONET.
• Reducing provisioning complexity