Document Number: EDCS-287599
Originator : Luai Bakour
Ginni Chadha
jumper2Wiggle Test Procedure for Optical Devices
This document describes the requirements for characterizing optical power variation induced by mechanical disturbance in optical devices with optical connector ports. The test requirements here serve as a reference to Cisco’s internal qualification teams as well as for optical component suppliers.
Approvers
Department Name
HERBU- Platform Engineering Neilus O’Sullivan
Mgr,Hardware Engineering
GCSM John Oberstar,
Technology Manager - Optics Manufacturing Caroline
Shannon
Manager, Optics Process Technology
Reviewers
Department Name
Optics-tech-council All
IRG-optics-council All
A printed version of this document is an uncontrolled copy.
Modification History
Date Name Comments 06/11/2003 Luai Bakour, Ginni Chadha,
Initial release
Jay Bhagat, Christian Hristu,
Cuong Tu
08/04/2003 Luai Bakour Changed file name
02/17/2004 Ginni Chadha Revised section 5.3.2
A printed version of this document is an uncontrolled copy.
Table of Contents
1. Introduction (4)
2. Scope (4)
3. Definitions (4)
4. Measurement Error (5)
5. Test Procedure (6)
5.1 General Description of the Wiggle Test (6)
5.2 Test Set up (6)
5.3 Test Methodology for Tx port (6)
5.4Test Methodology for Rx port (18)
6. Pass/Fail Criteria (10)
7. Data and Analysis Requirements (11)
8. Production Sampling and Re-Qualification (11)
9. Fiber Cable (11)
10. Appendix A (12)
10. Appendix B (13)
11. References (14)
A printed version of this document is an uncontrolled copy.
1. Introduction
Cisco has determined that some optical transceivers have a susceptibility to fiber optic cable induced stress at the optical ports resulting in variations in the transmitted optical power. This variation is dependent on the component’s optical port connector material, design and cable connector. This stress, typically created by disturbing a ”loaded” fiber at the component’s optical port, is commonly referred to as ”Wiggle”. This may lead to signal levels falling below the optical link budget requirements and adversely impact data integrity. Cisco vendors should use the requirements described in this document for the Wiggle test for product qualification. These requirements are also intended to provide a common test methodology within Cisco.
2. Scope
This document specifies the test requirements for qualifying an optical device with connectorized fibe
rs due to “wiggle” at the optical ports of the device. The requirements should not be applied to a specific cable manufacturer but rather encompass various different connector-cable assemblies available in the industry. It is highly recommended that cables from connector vendors commonly used by Cisco and/or our customer base be used for these Qualification tests to replicate the connector types likely to be encountered in the field. (See Appendix A for vendor list). Any deviations to the proposed test methods should be reviewed and approved by Cisco prior to actual qualification testing.
3. Definitions
Wiggle Loss: Wiggle Loss is defined as the variation in coupled output power (with respect to a no-load measurement) of an optical module when the cable/connector is stressed by a loaded or weighted fiber. This loss may be due to the impairment of the materials involved, design or excursion beyond the tolerance limits of the connectors / device port. Dependent upon the product type and design, the degradation in performance can occur at the transmit and/or receive ports of the device. The degradation is typically more pronounced on the transmit (Tx) side compared to the receive (Rx) side.
Maximum Tx Wiggle Loss: Maximum Wiggle Loss is defined as the maximum variation of measured output power (with respect to a no-load measurement) of a transmitting device when the loaded cable is stressed at various angles with respect to the module.
Maximum Rx Wiggle Loss:Maximum Rx Wiggle Loss is defined as the maximum degradation in received power or receiver sensitivity referred to the no-load value when the connector in a module is stressed at various angles with loaded fiber.
A printed version of this document is an uncontrolled copy.
Qualification Test: Vendors are expected to demonstrate the robustness of their product against wiggle loss by means of a qualification test. This qualification test uses loads to apply stress to the connector and transfer stress to the device port while measuring any degradation in optical parameters.
Fiber Cable Classifications:
Single Fiber Cable Classification (As per GR 326)
Type I Media Reinforced jacketed cable of any diameter used as jumper. Type II Media Cable with 90
0 um buffer coating that may or may not be reinforced.
Type III Media Connectors mounted on fiber with a 250 um coating.
Multiple Fiber Cable Classification (As per GR 1435)
Type I Media Multiple fibers arranged in a linear array and bound with a matrix material into a single unit (i.e., fiber ribbon).
Type II Media Fiber ribbon enclosed in a reinforced jacket.
Type III Media Single fiber with a buffer or coating of approximately 0.9 mm.
(Single buffered fibers that are not bundled into a group.)
4. Measurement Error
The criteria described herein does not consider potential measurement errors. Both the mean value and the root mean square value of the measurements are required to assess the variance in measurement due to potential sources of error.
A printed version of this document is an uncontrolled copy.
豫公网安备41160202000603
站长QQ:729038198
关于我们
投诉建议