Mode-Conditioning Patch Cord Description - Cisco 7206VXR - VPN Bundle Router Configuration Manual

Chapter 3 Installing a Cisco 7200 VXR Router
Table 3-4
Table 3-4
CWDM Product Number
CWDM-SFP-1470
CWDM-SFP-1490
CWDM-SFP-1510
CWDM-SFP-1530
CWDM-SFP-1550
CWDM-SFP-1570
CWDM-SFP-1590
CWDM-SFP-1610

Mode-Conditioning Patch Cord Description

A mode-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
multimode optical fiber.
OL-5013-09
provides NPE-G2 CWDM SFP module configuration information.
NPE-G2 CWDM SFP Module Configurations
Figure 3-17
Connecting I/O Controller, NPE-G1, or NPE-G2 Cables
Color
Gray
Violet
Blue
Green
Yellow
Orange
Red
Brown
shows a diagram of the mode-conditioning patch cord assembly.
Cisco 7200 VXR Installation and Configuration Guide
Figure 3-17) to a graded-index
3-23