angle cleaving larson donald
TRANSCRIPT
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Mechanical Splice with Keyed
Angle Cleaved Fibers
9i28 KeyedAngleSplice R4.ppt
Don Larson
Lab Project Manager
3M CompanyCommunication Markets Division
Austin, Texas
Co-authors:
-Dr. William V. Dower-Dan J. Treadwell
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Fiber optic mechanical splices with keyed, angle
cleaved fibers are an attractive option for achievinglow return loss for analog video applications,
especially in outside plant where long term splice
stability is an important consideration.
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Mechanical splices: in outside plant over 20 years
Fast and easy installation without investing in fusion equipment
Perpendicular cleave fibers: well accepted for FTTH, especially in Asiafor data and digital video
Standard video transmission in North America is analog
Analog networks require stringent reflection performance
Splice joint
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For AM-VSB (analog video) Telcordia GR-765
requires 45dB with objective of 50dB
IEC 61753-131-3 Grade 1 specification is 60dB
Telcordia GR-765 Generic Requirements for Single Fiber Single-Mode Optical Splices
and Splicing Systems
IEC 61753-131-1 Fibre Optic Interconnecting Devices and Passive Components-Performance Standard Part 131-3: Singlemode Mechanical Fibre Splice for Category U
Uncontrolled Environment
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Return loss (RL) of 60dB: difficult for
perpendicular cleaved mechanical splices to meet at
extremes of outside plant temperatures of-40C/75C (-40F/167F)
We will show that keyed angle cleave mechanical
splices are a viable technique for outside plantanalog signal transmission systems
Keyed, Angle Cleave Splice
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Reflection:light which is reflected from an interface
Some reflection from an interface becomes return loss
Return loss (RL): reflected light which is guided in the
fiber core toward transmitter (backreflection)
Keyed, Angle Cleave SpliceReflection
Return loss Transmitted LightIncident Light
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Gel: thixotropic dispersion
in silicone fluid
Matches index of opticalfibers at room temperature
Refractive indices of gel
and glass change withtemperature
Index change withtemperature (dn/dT)
Glass
Particles
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Calculated
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Gel
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No Significant Optical Performance Change
Temp Cycle Chamber
Water Tank
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Measured: HP Reflectometer
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*Due to constructive interference
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Pairof Fiber Ends in Gelat -40Cor 75C
Theoretical MaximumReturn Loss vs. Fiber Endface Angle
o o o
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180misaligned
Centers are 15.3 um apart
For both cases:
Clad Diameters = 125 um
Edge R = 0 um (not polished)
Cleave Angle = 7
45misaligned
Centers are 5.9 um apart
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0 samples remained above 70dB, fully met analog requirements
42 mis-keyed fiber ends, the RL was generally better than 60db180mis-keyed fiber ends, the RL was not acceptable for analog
1310nm
T/C -40C/75C, 21 cycles
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Open
AluminumSplice Element
ClosedAluminum
Splice Element
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Cleaving mechanism
automatically tensions, torques,scribes and cleaves fiber
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Angle Cleave Fiber using Fiber HolderInsert Fibers and
Activate Splice
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When second holder is rotated 180 degrees, the two fibers will be keyed
7 Degree Angle Cleave
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Optical Stability of Mechanical Splice -40C to 75C
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Fiber optic mechanical splices with keyed,angle cleave fibers are an attractive option
for achieving low return loss for analog video
applications, especially in outside plantwhere long term splice stability is an
important consideration.
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THANK YOU
Contact Information: [email protected]
Authors:-Donald K. Larson
-Dr William V. Dower
-Dan J. Treadwell