Why Optical Fiber Characterization Report is Essential? - Technopediasite

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Friday, November 30, 2018

Why Optical Fiber Characterization Report is Essential?


We all know a simple formula of communication " No media- No communication". Today optical fiber is the best media in telecommunication sector because optical fiber have the capacity of high carrying. WDM technology support millions of channel on a pair of optical fiber but both high-speed and high-quality transmission systems require performance verification of the network’s fiber infrastructure to ensure that the equipment can operate reliably and meet rigorous performance standards. Line rates at 10 Gbit/s and 40 Gbit/s and technologies such as Dense Wavelength Division Multiplexing (DWDM) and Optical Transport Network (OTN) require a detailed suite of conventional measurements, as well as additional tests such as dispersion measurements.

The number of optical tests required to perform a comprehensive fiber characterization generates a large quantity of data to be delivered to the network operator. Here comes the problem of compiling and formatting of the test results into a comprehensive and professional report using minimum working time and minimum risk of manipulation errors.

Why Optical Fiber Characterization Report is Essential?
Why Optical Fiber Characterization Report is Essential

Why Optical Fiber Characterization Report is Essential?

If the fiber is not characterized before the installation of system components, substantial delays in service provisioning or an increase in the time to repair can occur, leading to project postponements and missed turn-up commitments. Detailed records must be generated for any test parameter that can affect the transmission quality, and system limits must be taken into consideration for future provisioning. The fiber characterization report, a contractual document, must be provided to the service provider by the fiber installer or a third-party fiber characterization service company.

If the network fails to perform as contracted and reported, the network provider requires the ability to test the network and pinpoint the trouble source. Comprehensive and complete fiber characterization report is the key information in this troubleshooting scenario: It allows to quick comparing measurements recorded during the fiber installation with current test results. This can be used to isolate and sectionalize problems as well as assign responsibility to restore the issue, if required.

Furthermore, the verification of fiber performance and the comparison with commissioning/
acceptance test values is useful for ongoing network analysis and trending. A complete and comprehensive fiber characterization report allows for the investigation of the fiber’s behavior and degradation.


Professional and optimized test report document of Optical Fiber
The use of such a fiber characterization report is critical at any steps of the network life cycle. This pushes the report quality further ahead. It shall be generated in a professional format and shall include all of the relevant information related to the link as well as detailed measurement results. But furthermore, it shall fulfill the end customer’s requirements in terms of information content and document format.

Multiple test results management of Optical Fiber
As transmission system performance increases, the number of test parameters is more and more important. Conventional tests, the core of the fiber characterization report, include Insertion Loss (IL), Optical Return Loss (ORL), and bi-directional OTDR measurements at specific wavelengths (1310/1550/1625 nm). The OTDR provides loss, distance, and reflectance values for each of the in-line components of the link such as splices and connectors. The resulting report of conventional measurements is already a complex and massive report.

In addition, dispersion tests have to be included in the final report since these results ensure the capability of the link to run at a very high bit rate or DWDM transmission systems. Dispersion testing consists of Polarization Mode Dispersion (PMD) and Chromatic Dispersion (CD). Both measurements are origin-to-end tests, but the wavelength-dependent characteristic of CD measurements can result in the generation of a massive table of data when considering the entire wavelength band, from 1250 to 1650 nm, in a CWDM transmission system for example.


When working with DWDM systems, another parameter, Attenuation Profile (AP), must be taken into account. The AP provides the fiber attenuation according to the wavelength and over the entire link. This results in an additional source for an increased number of test results and an additional table in the final acceptance report.

Measurement result consistency


The large number of test results has to be compiled and certified. It is definitely not an obvious task to extract these thousands of values, sort them out and organize them into dedicated tables. As each value defines the network ability to transmit at a given rate, it is mandatory to ensure the consistency of the report and to reduce the risk of manipulation errors. Dealing with this huge amount of data can result in mixing OTDR traces from cable A with PMD values from cable B, and so on… This new generation of reporting software allows to reliably compiling all of this data into a single staged process, with step by step check points for permanent result consistency.

Improve productivity with fast report generation
Nowadays, none of the fiber installers or test contractors, characterizing fiber, can afford spending hours and hours of technician’s workload in generating reports. It is also not acceptable to postpone the job’s completion due to a delay in the acceptance report document. That’s why “time to report” is entirely part of the fiber characterization workload: Contract is over when the final report is provided to the end contractor.

Error-free Optical fiber characterization report


It is not only important to reduce report generation time, but it is also to generate an error-free report. Therefore, the automation process of the software has to be monitored by a step-by-step checking method. Dialog boxes and pop-up windows warn the technician of any potential problems during the report generation process.

In addition to the different check points, a set of thresholds and other criteria can be defined, offering additional information about the report quality. Corresponding pass/fail information is provided throughout the result tables, displaying different types of warnings, if applicable.
Different alarms enable technicians to locate errors in the report.
Errors in Optical Fiber report


As compiling the data into a spreadsheet is a tedious task, the technician should prefer to review all the results before starting the final stage. That’s why FiberCable offers a complete preview of the report where missing information and inconsistencies are pointed out . This step in the report generation process enables to avoid multiple result compilations increasing dramatically the time to final report generation.
Complete fiber characterization report preview
Optical Fiber Characterization report

Conclusion
Professional fiber characterization report format with good legibility has to combine all the tests results,alarms and information, providing the end user the complete information about the fibers laid down. The aim of such a report is to be the conclusion of the installation job, as well as to be regularly and easily consulted by any managers or technicians when fiber manipulations or system upgrade have to be carried out.

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