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Managing Optical Power in Point-to-Point Deployments

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 Seployments

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.