Cisco Systems NPE-175, NPE-225 manual 11provides Cwdm SFP module option information for the NPE-G2

Chapter 6 NPE-G2 Overview

NPE-G2 Memory Information and Specifications

Table 6-11provides CWDM SFP module option information for the NPE-G2.

Table 6-11	CWDM SFP Module Options
Product Number		Color
CWDM-SFP-1470		Gray
CWDM-SFP-1490		Violet
CWDM-SFP-1510		Blue
CWDM-SFP-1530		Green
CWDM-SFP-1550		Yellow
CWDM-SFP-1570		Orange
CWDM-SFP-1590		Red
CWDM-SFP-1610		Brown

Mode-Conditioning Patch Cord Description

Amode-conditioning patch cord can be used with the SFP-GE-L= (SFP module) to allow reliable laser transmission between the single-mode laser source on the SFP module and a multimode optical fiber cable.

When an unconditioned laser source designed for operation on single-mode optical fiber is directly coupled to a multimode optical fiber cable, an effect known as differential mode delay (DMD) might result in a degradation of the modal bandwidth of the optical fiber cable.

This degradation results in a decrease in the link span (the distance between a transmitter and a receiver) that can be supported reliably. The effect of DMD can be overcome by conditioning the launch characteristics of a laser source. A practical means of performing this conditioning is to use a device called a mode-conditioning patch cord.

A mode-conditioning patch cord is an optical fiber cable assembly that consists of a pair of optical fibers terminated with connector hardware. Specifically, the mode-conditioning patch cord is composed of a single-mode optical fiber permanently coupled off-center (see Offset in Figure 6-11) to a graded-index multimode optical fiber. Figure 6-11shows a diagram of the mode-conditioning patch cord assembly.

Network Processing Engine and Network Services Engine Installation and Configuration

OL-4448-12 6-19