TIA FO-2.2 Task Group on Modal Dependence of Bandwidth
                             Report to 802.3 HSSG
          
                              Michael J. Hackert
                                   Chairman
                            HACKERT_MJ@CORNING.COM
          
          
        TG 2.2 Overview
            - Scope summary
            - Current status
            - Example results
            - Future Activities
          
        2.2 TG Scope
            - Develop recommendation of bandwidth prediction   
            methodology for the short haul interconnect application.
            - Determine if a specifiable launch condition exists which   
            provides a better agreement between fiber bandwidth   
            characterization and actual performance.
            - The ultimate goal will be to devise a bandwidth test for   
            fiber which is representative of the installed cable   
            performance.    
            - Develop a recommendation for test methods as   
            appropriate.
          
        2.2 TG Focus
            - Current short wavelength (850 nm window) sources (e.g.   
            VCSEL and CD laser technology).
            - One fixed length - 300 m.   
            - 62.5 and 50 mm fiber will be included with equal   
            priority.
          
        2.2 TG Evaluation Criteria
            - Agreement between fiber characterization and source /   
            field measurement,
            - Measurement reproducibility, and   
            - Ability to be readily implemented by test equipment for   
            fiber and sources.    
          
        2.2 TG Additional Considerations
            - Any proposed launch condition will be in addition to the   
            standard overfilled launch.    
            - A method must be provided to both measure the fiber and   
            to verify the sources launch an acceptable modal content.    
          
        2.2 TG Current Status
            - The scope has been established.
            - A work plan has been developed.    
            - Routine meetings are in progress.    
            - Experimentation has begun and results show promise.
          
        62.5 =B5m Multimode Fiber 850 nm Bandwidth Gain Factor   
        Distribution (plot)
          
        Observations and Conclusions from Example Results
            - Histogram of 850 nm SMF launch bandwidth shows 3x   
            average increase for 26 fibers.    
            - All fibers increased but the minimum increase was 1.1x.
            - Further work is required to understand why some fibers   
            increased more than others.    
          
        2.2 TG Current Status
            - No conclusion can be drawn yet.
            - Significantly more work will be required to characterize   
            fiber and source performance.
            - Anyone interested in participating can contact Mike   
            Hackert at HACKERT_MJ@CORNING.COM.    
          
        2.2 TG Future Activities=09
            - Continue evaluation along current scope
            	- Develop recommendation of bandwidth prediction   
            	methodology   
            - Expand scope to include:   
            	- Evaluate variation / sensitivity to launch   
            	condition,   
            	- Extending results to other lengths,   
            	- Evaluating the performance of installed systems,   
            	- Determination of impact to chromatic dispersion, and   
            	- Long wavelength (1300 nm window) operation.