Cisco Systems 15216 EDFA2 manual Maximum Input Power, Channel Loading, Maximum Channel Power

Chapter 2 Technical Specifications

Optical Specifications

F I N A L D R A F T - C I S C O C O N F I D E N T I A L

2.1.1 Maximum Input Power

The ONS 15216 EDFA2 operates at a gain setting between 13 and 22 dB. Each gain setting has a maximum input power. The maximum input power is defined as 17 dBm (the maximum output power) minus the gain setting. For example, at a gain setting of 22 dB, the maximum input power is –5 dBm. At a gain setting of 13 dB, the maximum input power is 4 dBm. Prolonged operation beyond the maximum input power can shorten the life of the ONS 15216 EDFA2.

External optical attenuators are required to reduce the total input power to less than or equal to 4 dBm.

2.1.2 Channel Loading

You can ensure a smooth upgrade path from a single channel to the maximum numbers of channels with a minimum disruption of service if the per-channel power of the single channel is properly set from the start. The per-channel power should be set so that at full channel loading, the total input power is less than the maximum power indicated in Table 2-2. For example, if the maximum number of channels at full loading is 18 and the gain is set to 22 dB, the maximum per channel power is –17.6 dBm.

Use Table 2-2to calculate per-channel power as a function of the maximum total number of channels at full loading. Contact Cisco TAC with any questions or concerns regarding maximum input power or setting the upgrade path.

Table 2-2 Maximum Channel Power

Composite Input

Power (dBm)

4

3

2

1

0

–1

–2

–3

–4

–5

Corresponding

Max. Gain (dB)

13

14

15

16

17

18

19

20

21

22

Number of

Channels at Full

Loading

Maximum per Channel Input Power at Maximum Gain Setting (dBm)

1

4.0

3.0

2.0

1.0

0.0

–1.0

–2.0

–3.0

–4.0

–5.0

2

1.0

0.0

–1.0

–2.0

–3.0

–4.0

–5.0

–6.0

–7.0

–8.0

3

–0.8

–1.8

–2.8

–3.8

–4.8

–5.8

–6.8

–7.8

–8.8

–9.8

4

–2.0

–3.0

–4.0

–5.0

–6.0

–7.0

–8.0

–9.0

–10.0

–11.0

5

–3.0

–4.0

–5.0

–6.0

–7.0

–8.0

–9.0

–10.0

–11.0

–12.0

6

–3.8

–4.8

–5.8

–6.8

–7.8

–8.8

–9.8

–10.8

–11.8

–12.8

7

–4.5

–5.5

–6.5

–7.5

–8.5

–9.5

–10.5

–11.5

–12.5

–13.5

8

–5.0

–6.0

–7.0

–8.0

–9.0

–10.0

–11.0

–12.0

–13.0

–14.0

9

–5.5

–6.5

–7.5

–8.5

–9.5

–10.5

–11.5

–12.5

–13.5

–14.5

10

–6.0

–7.0

–8.0

–9.0

–10.0

–11.0

–12.0

–13.0

–14.0

–15.0

11

–6.4

–7.4

–8.4

–9.4

–10.4

–11.4

–12.4

–13.4

–14.4

–15.4

12

–6.8

–7.8

–8.8

–9.8

–10.8

–11.8

–12.8

–13.8

–14.8

–15.8

13

–7.1

–8.1

–9.1

–10.1

–11.1

–12.1

–13.1

–14.1

–15.1

–16.1

14

–7.5

–8.5

–9.5

–10.5

–11.5

–12.5

–13.5

–14.5

–15.5

–16.5

15

–7.8

–8.8

–9.8

–10.8

–11.8

–12.8

–13.8

–14.8

–15.8

–16.8

Cisco ONS 15216 EDFA2 Operations Guide

2-2

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