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Terminal Amplifier Solutions

The 96-Channel Amplifier (AMP1) is a terminal amplifier that integrates two erbium-doped optical amplifiers to provide bidirectional amplification of DWDM optical signals in a point-to-point bookended configuration. The amplifier is optimized for 10-Gbps, 25-Gbps, and 100-Gbps signals, and includes an embedded optical supervisory channel (OSC) used for span loss control.

The AMP1 is designed to provide amplification of the composite signal in single span point-to-point applications between 96-Channel DWDM Mux/Demux modules as shown in Figure 1.

Figure 1: 96-Channel Amplifier Application

Provisioning a 96-Channel Amplifier Node

Use this procedure to provision the 96-Channel Amplifier (AMP1) in a point-to-point configuration.

Prerequisites:

The amplifier module is created. See Provisioning a terminal amplifier module.

Enter configuration mode.
bti7800# config
```
bti7800(config)#
```
Verify the amplifier that you want to configure is created.
For example, to verify that amp:1/11 is created:
bti7800(config)# do show amp | include amp:1/11
```
Amp Name                      : amp:1/11 
bti7800(config)# 
```
Create the optical group for this amplifier.
For example, the following creates group 1:
bti7800(config)# amp group 1
```
Value for 'group-type' [eqlzLine,eqlzTerm,noEqlzLine,noEqlzTerm,...]: noEqlzTerm 
bti7800(config-group-1)# exit 
bti7800(config-amp)# commit 
Commit complete. 
```
The 96-Channel Amplifier can only be used in a non-equalizing terminal configuration. Therefore, its group-type must be noEqlzTerm.

Assign the amplifier to this group.

When the group is created, the degree is also created. A noEqlzTerm has only one degree (degreenum 1).

For example, to assign the 96-Channel Amplifier to group 1 degree 1:

bti7800(config-amp)# eqpt amp:1/11 groupnum 1 .

Value for 'degreenum' (<unsignedInt, 1 .. 4>): 1 
bti7800(config-eqpt-amp:1/11)# exit 
bti7800(config-amp)# commit 
Commit complete

The system automatically creates all the ports on the amplifier.

bti7800(config-amp)# do show amp | include 1/11

Amp Name                      : amp:1/11  
Port Name                     : osc:1/11/1/1.1  
Port Name                     : line:1/11/1/1  
Port Name                     : client:1/11/1/1  
Port Name                     : wdm:1/11/1/1  
Port Name                     : dcm:1/11/1/1

Configure the OSC settings.

For example, to configure far end identifier mismatch monitoring:

bti7800(config-amp)# osc osc:1/11/1/1.1

bti7800(config-osc-osc:1/11/1/1.1)# fe-im-mon true 
bti7800(config-osc-osc:1/11/1/1.1)# exp-fe-ipaddr 10.1.1.1 
bti7800(config-osc-osc:1/11/1/1.1)# exp-fe-grp 1 
bti7800(config-osc-osc:1/11/1/1.1)# exp-fe-degree 1 
bti7800(config-osc-osc:1/11/1/1.1)# exit 
bti7800(config-amp)# commit Commit complete.

Configure port and wdm settings as required.
See Managing optical power for details on the parameters to set for the specified applications.
Note: The fiber type must be configured for the system to automatically compensate for the tilt.
- To configure client port settings, use the amp port client:1/11/1/1 command.
- To configure line port settings, use the amp port line:1/11/1/1 command.
- To configure DCM port settings, use the amp port dcm:1/11/1/1 command.
- To configure WDM settings, use the amp wdm wdm:1/11/1/1 command.
When you are finished, apply the provisioning.
bti7800(config-amp)# commit
```
Commit complete. 
```

The local amplifier node is created. Proceed to create the amplifier node at the far-end network element.

Managing Optical Power

There are two types of BTI7800 point-to-point network deployments: standard and 100-Gbps coherent-only. The standard system supports a mix of transceivers, for example, 100-Gbps coherent, 4x28-Gbps, and 10-Gbps, and supports a maximum supported span loss of 23 dB. The 100-Gbps coherent-only system supports only 100-Gbps coherent transceivers, and supports span losses greater than 23 dB.

The default post-amp gain value is set at 4.0 dB. To adjust the post-amp-gain you use the amp wdm CLI command.

Standard System Deployment: The default post-amp gain is used for the first 40 channels. You adjust the post-amp gain when your system reaches 40, 80 and 96 channels.
100-Gbps Coherent-only Deployment: The post-amp gain should be set to 5.0dB for the first 40 channels. You adjust the post-amp gain when your system reaches 40, 80 and 96 channels.

Note: If you are installing more than 40 channels during first-time installation, you must provision the additional channels before bringing all the channels into service.

To add channels after first-time installation, you must perform a post-amp gain adjust procedure, which is not covered in this guide. Adding channels after first-time installation should be performed during a maintenance window, although the BTI7800 supports post-amp gain adjustments while the system is in service.

Managing Optical Power in a Standard Point-to-Point Deployment

The following sections provide information on the minimum required procedures to control optical power levels in a standard point-to-point deployment after first-time installation.

Note: Add channels in increasing order of the channel frequencystarting with 191.80 THz, 1563.05 nm.

Verifying the OSC Receive Power for a Standard Point-to-Point Deployment

On low-loss spans it might be necessary to fit a fixed pad attenuator to the Line port of the 96-Channel Amplifier to avoid overload of the 1510 nm OSC receiver. The maximum supported power to the OSC receiver is -7 dBm.

For each amplifier, verify the OSC optical power received using the command: show statistics current entity osc:chassisID/location/ BIC-1/<portNum>.<oscNum> binLength 1Minute, and reference the parameter: Optical power received. As needed, adjust the pad to the Line port of the amplifier, based on the following values to operate at power levels up to 23 dBm:

If the OSC optical power received is ≤ -7 dBm, do not fit a pad.
If the OSC optical power received is between -2 and -7 dBm, fit a 5-dB pad to the Line port.
If the OSC optical power received is > -2 dBm, fit a 10-dB pad to the Line port.

Provisioning Tilt Control Parameters: Standard Deployments

The following parameters on the 96-Channel Amplifier must be provisioned when the module is installed for the first-time:

DCM: Must be associated to the amplifier. Use the command amp eqpt.
Fiber type: Using the command amp wdm.

Once these values are configured, the amplifier automatically compensates for the tilt in the system.

Provisioning Post-Amp Gain Control: Standard Deployments

The default post-amp gain value is set at 4.0 dB.

You adjust the post-amp gain when your system reaches 40, 80 and 96 channels. To adjust the post-amp-gain you use the amp wdm CLI command, in Configuration model.

If you are installing more than 40 channels during first-time installation, you must provision the additional channels before bringing all the channels into service. To add channels during first-time installation use the command amp wdm.

Note: To add channels after first-time installation, you must perform a post-amp gain adjust procedure, which is not covered in this guide. Adding channels after first-time installation should be performed during a maintenance window, although the BTI7800 supports post-amp gain adjustments while the system is in service.

Managing Optical Power in a 100-Gbps Coherent Point-to-Point Deployment

The following sections provide information on the minimum required procedures to control optical power levels in a 100-Gbps coherent point-to-point deployment after first-time installation.

Note: Add channels in increasing order of the channel frequencystarting with 191.80 THz, 1563.05 nm.

Note: DCMs (Dispersion Compensation Modules) are not used in a 100-Gbps coherent-only deployment.

Verifying the OSC Receive Power for a 100-Gbps Coherent Point-to-Point Deployment

On low-loss spans, it might be necessary to fit a fixed pad attenuator to the Line In port of the 96-Channel Amplifier to avoid overload of the 1510 nm OSC receiver. The maximum supported power to the OSC receiver is -7 dBm.

For each amplifier, verify the OSC optical power received using the command: show statistics current entity osc:chassisID/location/ BIC-1/<portNum>.<oscNum> binLength 1Minute, and reference the parameter: Optical power received. As needed, adjust the pad to the Line In port of the amplifier, based on the following values to operate at power levels up to 23 dBm:

If the OSC optical power received is ≤ -7 dBm, do not fit a pad.
If the OSC optical power received is between -2 and -7 dBm, fit a 5-dB pad to the Line port.
If the OSC optical power received is > -2 dBm, fit a 10-dB pad to the Line port.

Managing a Receive Power Overload

To avoid an overload of the 100-Gbps transceivers, manually provision the attenuation of the client transmission loss to 5.0 dB using the command amp port.

Provisioning Tilt Control Parameters: 100-Gbps Coherent Deployments

The Fiber Type parameter on the 96-Channel Amplifier must be provisioned when the module is installed for the first-time. To provision the fiber type use the command amp wdm.

Once this is configured, the amplifier automatically compensates for the tilt in the system.

Provisioning Post-Amp Gain Control: 100-Gbps Coherent Deployments

The default post-amp gain value is set at 4.0 dB. To adjust the post-amp-gain you use the amp wdm CLI command, in Configuration mode.

The post-amp gain should be set to 5.0 db for the first 40 channels. You adjust the post-amp gain when your system reaches 40, 80 and 96 channels.