Specifications

CHAPTER
1-1
Cisco ONS 15216 EDFA2 Operations Guide
78-13908-02
1
Applications
This manual describes how to install and operate the Cisco ONS 15216 erbium-doped fiber amplifier 2
(EDFA2). The ONS 15216 EDFA2 is an optical amplifier that enables the migration to next generation
all-optical networks. The EDFA2 enables bandwidth-on-demand and wavelength protection switching
that extend dense wavelength division multiplexing (DWDM) links by hundreds of kilometers.
Using the ONS 15216 EDFA2, you can add or drop optical signals from a span in a DWDM network
without negatively affecting (degrading) the other optical signals on the same span.
Bandwidth-On-Demand
The ONS 15216 EDFA2 is a technology for bandwidth-on-demand wavelength services. Depending on
the settings and the input power, every wavelength in a ONS 15216 EDFA2 is guaranteed to be amplified
by 13 to 22 dB. With ONS 15216 EDFA2 gain control technology, amplification for each wavelength
remains constant at all times as wavelengths are added or dropped from an optical fiber. As long as the
total input power of all wavelengths is between 4 dBm and –27 dBm, any number of wavelengths can
be amplified.
Wavelength Protection Switching
The ONS 15216 EDFA2 uses wavelength protection switching to restore wavelengths that are lost after
a fiber cut. Figure 1-1 shows an example of wavelength protection switching. In this example, two
wavelengths are routed clockwise around a metro ring, and two wavelengths are routed
counter-clockwise around the same ring. Of the two clockwise wavelengths, only one transits the span
linking locations C and D. If a fiber cut occurred on this span, the affected wavelength could be restored
by rerouting it (counter-clockwise) around the ring to location D. Wavelength protection switching
minimizes the amount of bandwidth allocated for restoration because only the affected wavelength is
restored and not the entire fiber.