Proposed experiments on time-variation due to polarization and MMF shaking and initial results - PowerPoint PPT Presentation

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Proposed experiments on time-variation due to polarization and MMF shaking and initial results

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Proposed experiments on time-variation due to polarization and MMF shaking and initial results jonathan king 12-Oct-04 Quasi static time variation measurements Slow ... – PowerPoint PPT presentation

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Title: Proposed experiments on time-variation due to polarization and MMF shaking and initial results


1
Proposed experiments on time-variation due to
polarization and MMF shakingand initial
results
  • jonathan king 12-Oct-04

2
Quasi static time variation measurements
  • Slow speed testing on FDDI fibres 300m link with
    2 worst case connector offsets
  • Impulse response measurements
  • Gain switched DFB laser source, 65um active area
    8GHz receiver
  • Measuring
  • time variation 'envelopes'
  • quasi-static impulse response variation
  • Separate polarization controls
  • manual controller 'ears'
  • automatic polarization scrambler (HP11896A)
  • Figure-of-8 'shaker' in single-mode fibre (9ply,
    120mm diameter)
  • to be able to emulate single mode patchcord
    perturbation
  • Separate MMF fibre shaker
  • Figure-of-8 'shaker' multi-mode loop (9ply,
    120mm diameter)
  • Figure-of-8 shakers have up to 5" travel, from
    0.01 to 1 Hz cycle rate
  • Max acceleration at higher frequencies is 0.5g

3
'Worst case link' test bed two 7um offset
connections
  • 2 lossy connections emulated with offset spliced
    patchcords
  • one 7um offset before, one 7um after main fibre
  • 3 additional MMF-MMF connections at input to
    main fibre (with nominal offset)
  • Polarization controls and mechanical fibre
    'shakers'

4
Initial Results IPR envelopes
1
  • Polarization vs mechanical perturbation effect
    on impulse response
  • Envelopes of impulse response with 1 axis
    mechanical fibre shaker on and
  • input polarization 1
  • input polarization 2
  • input polarization scrambler on
  • polarization scrambler off, and second mechanical
    shaker added
  • notes
  • single horizontal axis fibre mechanical shaker
    may not be fully exploring mode power
    distribution
  • adding second scrambler in vertical axis seems
    to have same impact as polarization scrambler

2
3
4
5
Quasi static time variation impulse
responses ......an illustration
  • Step shaker through range of movement and record
    sequence of impulse responses
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