Describes the NCS1K-EDFA optical amplifier module, including preamplifier and booster functions, OSC support, OCM monitoring, front-panel callouts, controller-to-port mappings, and COM-CHECK safety behavior.
The optical amplifier module (NCS1K-EDFA) is an NCS 1001 optical module that provides preamplifier and booster amplification for line-system deployments.
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Preamplifier (LINE-RX to COM-TX): Provides a single preamplifier variant with switchable gain ranges according to link loss.
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Range 1 provides 0 to 24 dB gain, and tilt control provides 24 to 27 dB gain with uncontrolled tilt.
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Range 2 provides 20 to 34 dB gain, and tilt control provides 34 to 37 dB gain with uncontrolled tilt.
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The COM-TX port provides 23 dBm output power.
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Booster amplifier (COM-RX to LINE-TX): Provides true variable gain booster amplification.
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The booster amplifier supports gain range 1 to 20. Gain range 20 to 25 has uncontrolled tilt.
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The LINE-TX port provides 23 dBm output power.
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The add or drop OSC channel supports both 1510 nm and 1610 nm wavelengths with a tolerance of +/-10 nm.
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The OCM assesses channel presence, gain regulation, and per-channel power monitoring.
Feature history
| Feature name |
Release information |
Feature description |
|---|---|---|
| Amplifier behavior |
Cisco IOS XR Release 7.3.1 |
Grid mode configuration for the optical amplifier supports 75GHz spaced channels. You can optimize the optical spectrum and granularity using gridless configuration. You can provision channels with arbitrary channel frequencies and channel widths. Up to 96 channels can be configured using gridless configuration. Modified commands include:
|
EDFA front view
| 1 |
XFP for OSC and additional OTDR feature |
| 2 |
SFP for OSC (Optical Service Channel) |
| 3 |
Status LED |
| 4 |
Service channel input and output ports [OSC – RX, TX] |
| 5 |
PRE and BST amplifier input and output ports [L (LINE) – RX, TX] [C (COM) – RX, TX] [COM – CHECK] |
Controller and optical port mappings
This table describes the mapping of controllers and optical ports for the optical amplifier module.
| Controller |
Optical ports |
|---|---|
| Ots 0/slot/0/0 |
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| Ots 0/slot/0/1 |
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| Ots 0/slot/0/2 |
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| Ots 0/slot/0/3 |
COM-CHECK |
COM-CHECK configuration
The COM-CHECK configuration supports safety behavior for high-power preamplifier deployments.
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Safety measures protect the fiber intranode between the preamplifier and the mux or demux section when the total output power on the COM-TX port is up to 23 dB. These measures compensate for extremely long spans.
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If the output power on COM-TX is less than or equal to 20 dB, the COM-CHECK port can be turned off and does not require a physical connection between the pre COM-CHECK and demux monitor port.
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In some cases, such as spans with high power requirements, safety on the preamplifier is necessary.
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The COM-CHECK PD9 is the safety port.
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The COM-RX controller, such as Ots 0/s/0/0, is not part of safety.
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The safety restart process is similar to the booster case, with some difference in the APR Check phase.
