Cisco 15216 EDFA2 Specifications download pdf (Page 26)

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Cisco ONS 15216 EDFA2/EDFA2-A Operations Guide, R2.4

July 2004

Chapter 1 Applications

1.3 Key Features

Figure 1-1 Wavelength Protection Switching

After a protection switch occurs, the number of wavelengths on each fiber changes. In the example, the

number of clockwise wavelengths increases to three, while the number of counter-clockwise

wavelengths decreases to one.

1.3 Key Features

The ONS 15216 EDFA2 has the following key features:

• Adjustable constant gain of 13 to 22 dB

• Gain flattening

• Transient suppression

• Low noise figure

• Automatic laser shutdown

• Simple Network Management Protocol (SNMP) MIBs

• Transaction Language 1 (TL1)

1.3.1 Constant Gain

Constant amplification (gain) per wavelength is important for ensuring that variations in power between

channels at the receivers is minimized. As wavelengths are added/dropped from an optical fiber, small

variations in gain between channels in a span can cause large variations in the power difference between

channels at the receivers. The ONS 15216 EDFA2 enables bandwidth-on-demand services by

guaranteeing that every wavelength is amplified by a value that can be set between 13 and 22 dB, no

matter how many wavelengths are being amplified.

Constant gain is achieved using an automatic control circuit that adjusts pump power when changes in

input power are detected. The ONS 15216 EDFA2 operates in Constant Gain Temperature Compensated

mode by default, but since there may be applications where other operating modes may be required, the

ONS 15216 EDFA2 can be set to operate in any one the following pump control modes:

• Constant Gain Temperature Compensated mode

• Constant Output Power mode

Fiber Cut

Wavelength is rerouted

Before

After

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Cisco 15216 EDFA2 Specifications Page 26