Conference 7.286::fddi

34.0. "Fiber Spec - 62.5/125" by BAGELS::WILLIAMS (Bryan Williams) Thu Feb 08 1990 17:56

TITLE:   OPTICAL FIBER, 62.5/125 MICRON, 0.275 NA, GRADED INDEX, GENERAL       
         SPECIFICATION FOR 


1.   GENERAL DESCRIPTION:

     This specification defines the detail requirements for an optical
     fiber of 62.5 micron core, 125 micron clad diameters, 0.275 Numerical
     Aperture, graded index profile, glass on glass construction.

     The intent of this specification is to meet ANSI/EIA/TIA 492AAAA
     and the EIA Building Wiring Standard requirements.

2.   APPLICABLE DOCUMENTS (Per latest revision on date of order):

     Electronic Industries Association

     EIA-4920000 3        Generic Specification for Optical Waveguide       
     Fibers

     EIA-492A000 1        Sectional Specification for Class 1a Multimode,                      
     Graded Index Optical Waveguide Fibers

     EIA-492AAAA          Detail specification for 62.5um core dia./125um
                          cladding dia., class 1a, multimode,graded index 
                          optical waveguide fibers (ref. ANSI/EIA/TIA -
                          492AAAA)

     EIA-455- 3A          Temperature Dependance of Attenuation

     EIA-455- 20          Measurement of Change in Optical Transmittance
     
     EIA-455- 27A         Methods for FO O.D. (Uncoated) Measurements
     
     EIA-455- 29          Refract. Index Profile (Trans. Interf.)
     
     EIA-455- 30A         Frequency Domain Inform. Trans. Capacity
     
     EIA-455- 31A         Fiber Tensile Proof Test
 
     EIA-455- 43A         Output Near Field Rad. Pattern of FO fibers

     EIA-455- 44          Refractive Index Profile, Refracted Ray Method     

     EIA-455- 45A         Microscope Method - FO Geometries
     
     EIA-455- 46          Spectral Atten. Meas for Multimode FO
     
     EIA-455- 47A         Output Far Field Radiation Pattern Measurement
     

     EIA-455- 48A         Diameter Measurement of Optical Waveguides
     
     EIA-455- 50A         Light Launch Conditions for MM Spectral Atten.
     
     EIA-455- 51          Pulse Distortion Meas. - MM FO Info. Trans. Cap
     
     EIA-455- 53          Atten. by Substitution -MM FO fibers, assemblies
     
     EIA-455- 54          Mode Scrambler Launch Reqmts - Info Trans. Cap.
     
     EIA-455- 55A         FO Coating Geometries Measurements
     
     EIA-455- 57          Optical Fiber End Preparation
     
     EIA-455- 58          Core Diameter Measurements of GI Optical Fibers
     
     EIA-455- 59          Optical Time Domain Reflectometry
     
     EIA-455- 73           Temperature-Humidity Cycling

     EIA-455- 168         Chromatic Dispersion Measurement of Multimode
     		          Graded Index and Single-mode Optical Fibers by
     		          Spectral Group Delay Measurement in the Time Domain

     EIA-455- 173         Geometry by Side view Technique
     
     EIA-455- 175         Chromatic Dispersion by Differential Phase

     EIA-455- 176 	  FO Geometries by Calibrated Gray Scale Analysis

     EIA-455- 177         Numerical Aperature

3.   REQUIREMENTS:

3.1   Mechanical:

3.1.1.  Optical Fibers:  The optical fibers defined by this specification 
        shall be graded index, glass on glass fibers, as follows:

3.1.1.1.  The fibers core diameter shall be 62.5 +/- 3 micron glass. EIA 
          455-58 shall be used as the overall guide to this measurement. 
          One of the following shall be used for the measurement:  

          A) EIA 455-29  (Transverse Interference) 
          B) EIA 455-43A (Near Field) 
          C) EIA 455-44  (Refracted Ray)



3.1.1.2.  The fibers cladding shall be 125 +/- 2 microns diameter glass, 
          measured in accordance with EIA 455-45A or -48A.

3.1.1.3.  The fibers shall be coated with a mechanically strippable 
          coating. A coating diameter of 250 +- 15 micrometers or 500 +- 25
          micrometers shall be used.  Measurements to be performed per
          EIA 455-55A or 455-173 

3.1.1.4   The core noncircularity shall be less than or equal to 6 % as 
          measured in accordance with EIA 455-45A

3.1.1.5.  The fibers cladding noncircularity shall be less than 2 % as 
          measured in accordance with EIA 455-45A or -48A

3.1.1.6.  The fibers core to cladding concentricity error shall be less 
          than or equal to 6 % measured in accordance with EIA 455-45A

3.1.1.7.  The coating/cladding concentricity error shall be less than or 
          equal to 16% as measured in accordance with EIA 455-55A

3.1.1.8.  The fibers shall be proof tested to ensure minimum tensile 
          strength. The tensile load, detailed in the purchase spec. shall
          be either: 

             a.  50 Kpsi (0.35 GPa) 
             b.  100 Kpsi (0.7 GPa)

          Testing to be performed per EIA 455-31A @ 23 +/- 5 degrees Celcius

3.2   Optical Requirements:

3.2.1   Attenuation: The fiber attenuation coefficient shall be such that 
        the cabled fiber attenuation coefficient shall be less than: 
        
            3.75 dB/Km at 850 nm and 1.5 dB/Km at 1300 nm @ 23 degrees C

          as tested in accordance with EIA 455-46 (Cutback Method). 
          Attenuation changes due to temperature will be detailed in cable
          purchase specifications.
          
          There shall be no localized attenuation greater that 0.2 dB as 
          inspected in accordance with EIA 455-59


3.2.2   Bandwidth: The bandwidth (information transmission capacity) of the 
        fiber shall be such that the cabled fiber bandwidth shall be 
        greater than 160 Mhz-Km at 850 nm and greater than 500 Mhz-Km at 
        1300 nm when tested in accordance with EIA 455-51 (Pulse 
        Distortion), or EIA 455-30A (Baseband Frequency Response).

3.2.3   Numerical Aperture: The numerical aperture of the cable shall be 
        0.275 +/- 0.015 at 850 nm, (2 meter length of cable) in accordance 
        with EIA 455-177

3.2.4   Chromatic Dispersion: Measurements shall be performed per EIA 455-168.
        or -175.

        The fiber shall exhibit zero dispersion wavelength and slope values 
        within the highlighted region shown in Figure 1, page 14 of EIA/TIA
        492AAAA (Detail specification for 62.5/125um,Class 1a multimode,graded
        index Optical Waveguide Fibers.)
    
    

    Is this 62.5/125 fiber specification still valid for current FDDI
    installations?  We have a government customer who needs to known exactly 
    what to include as salient characteristics in his request for proposal.
    
    Thanks,
    
    Laurie Richards

    The specification in .0 is still valid. The EIA/TIA 492AAAA Detail 
    Specification for 62.5/125 fiber is being revised, but only for 
    document format issues - not technical details.
    
    And FDDI requirements for the 62.5/125 micron fiber are still the same.
    
    Regards,
    
    	Dick Kirk
    	HPN Optical Engineering

    Thank You Very Much.
    
    Laurie

    Re: base note
    
    Do the stated loss figures include the connectors at the ends of the
    cable under test?  Does the "localized attenuation" figure of 0.2db
    refer to connectors or just to variances within the cable itself?
    
    TIA
    
    Brian Pituley
    NIS, Calgary