Fiber and Connector Losses in Raman Link ConfigurationFirst Published: February 08, 2013

Last Modified: February 08, 2013

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Text Part Number: OL-25024-01

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C H A P T E R 1Fiber and Connector Losses in Raman LinkConfiguration

This document provides important guidelines to be followed when configuring a Raman link regardless ofwhether you are configuring the Raman link using the Raman installation wizard or the Cisco TransportPlanner (CTP) XML file. Ensuring the desired gain and gain flatness is critical to the success of theconfiguration.

The Raman installation wizard automatically addresses any deviation in connector and fiber splice loss valuesby displaying warning messages appropriately, provided they are within the limits detailed in Table 1: Limitfor Connector Losses, on page 2. However, configuration of the Raman link using the CTP XML file isbased on the algorithms within CTP. Any deviation in the connector and fiber splice losses values leads tounpredictable behavior of the entire system, in terms of Raman tilt and optical signal-to-noise ratio (OSNR).For these reasons, configuring the Raman link using the Raman installationwizard is preferred than configuringusing the CTP XML file.

Table 1: Limit for Connector Losses, on page 2 contains the following fields:

• Conditions—Limit for connector losses were measured under the following conditions:

• No splice losses—Ideal conditions.

• Splice 0.1 dB every 2 km or 0.2 dB splice every 4 km—The maximum acceptable values thatcan be considered when configuring Raman link.

• Splice 0.1 dB every 4 km—The limit for connector losses values shows a realistic situation.

• Fiber type—The various fiber types used are:

◦Single Mode Fiber (SMF)

◦Enhanced large effective area fiber (ELEAF)

◦TrueWave RS (TW-RS)

• Target Gain—Expected Raman gain.

• Minimum Span [dB]-For the Raman link configuration to be successful, the span loss should be equalor greater than the value shown in Table 1: Limit for Connector Losses, on page 2.

• Limit for Connector Losses—Connector losses values that must not exceed for configuration to besuccessful.

Fiber and Connector Losses in Raman Link Configuration OL-25024-01 1

• Limit for Connector Losses, page 2

• Additional References, page 2

• Trademark Notice, page 3

• Obtaining Documentation and Submitting a Service Request, page 4

Limit for Connector Losses

Table 1: Limit for Connector Losses, on page 2 shows values that were estimated under ideal testcondition and may differ depending on the actual fiber type used, distance, etc.

Note

Table 1: Limit for Connector Losses

Limit forConnectorLosses (dB)

Target Gain [dB]Minimum Span Loss [dB]Fiber TypeConditions

MaxMinOPT-RAMP-CEOPT-RAMP-C

1.68.571521SMFNo splice loss

1.31071521ELEAF

1.113.591824TW-RS

0.78.571521SMFSplice 0.1 dBevery 2 km or0.2 dB spliceevery 4 km

0.51071521ELEAF

0.213.591824TW-RS

1.28.571521SMFSplice 0.1 dBevery 4 km

0.91071521ELEAF

0.613.591824TW-RS

Additional ReferencesRelated Documents

Use this document in conjunction with the other release-specific documentation listed in the following pages:

Fiber and Connector Losses in Raman Link Configuration2 OL-25024-01

Fiber and Connector Losses in Raman Link ConfigurationLimit for Connector Losses

DescriptionLink

Provides quick access to publications of Cisco ONSreleases.

Cisco ONS Documentation Roadmap

Provides background and reference material, proceduresfor installation, turn up, provisioning, and maintenance ofCisco ONS 15454, Cisco ONS 15454M2, and Cisco ONS15454 M6 dense wavelength division multiplexing(DWDM) systems.

CiscoONS 15454DWDMConfigurationGuide

Provides general troubleshooting instructions, alarmtroubleshooting instructions, and a list of error messagesthat apply to the Cisco ONS 15454, Cisco ONS 15454M2,and Cisco ONS 15454 M6 dense wavelength divisionmultiplexing (DWDM) systems.

Cisco ONS 15454 DWDM TroubleshootingGuide

Provides information about new features and enhancementsfor the CiscoONS 15454, CiscoONS 15454M2, and CiscoONS 15454 M6 DWDM platforms.

Release Notes for Cisco ONS 15454, ONS15454 M2, and ONS 15454 M6 DWDM

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Fiber and Connector Losses in Raman Link Configuration OL-25024-01 3

Fiber and Connector Losses in Raman Link ConfigurationTrademark Notice

Obtaining Documentation and Submitting a Service RequestFor information on obtaining documentation, submitting a service request, and gathering additional information,see the monthlyWhat's New in Cisco Product Documentation, which also lists all new and revised Ciscotechnical documentation, at:

http://www.cisco.com/en/US/docs/general/whatsnew/whatsnew.html

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Fiber and Connector Losses in Raman Link Configuration4 OL-25024-01

Fiber and Connector Losses in Raman Link ConfigurationObtaining Documentation and Submitting a Service Request