Presented

1
MT - Technology

• Presented
• to
• NCITS T11.1 WG HIPPI 6400 Optical
• Tucson, AZ US 98-12-15
• by
• Siemens Semiconductors, Fiber Optics
• Berlin, Germany
• Authors
• Lutz Melchior and Klaus Schulz

2
MT - TechnologyOverview

• Background
• Application
• Ferrule-Analysis
• Dimensions Tolerances
• Stress Analysis
• Stress Calculation
• Proposal

3
MT - TechnologyBackground

• Task
• To connect 2 12 or more fibers to with one
  ferrule
• Goals
• To verify optimal performance for
• 12 fiber connectors for parallel optical links
• 2 fiber connectors for the new SFF module
  generation

4
MT-TechnologyApplication (1)

• Connector to Connector
• - Functionality is Mechanical Splice -
• Insertion Loss reproducible
• Return Loss reproducible
• To get this
• Cleaning of the Connector-Endfaces before each
  Insertion is necessary,
• without Cleaning the Insertion Loss can
  increases by
• 0.3 dB (FRESNEL).
• Dust and other particles shall be removed before
  each insertion

5
MT-TechnologyApplication (2)

• Connector to Optical Port
• Cleaning of the Connector-Endface
• possible and necessary
• Cleaning of the Optical Port is difficult
• alignment pins are in the way
• inspection is difficult
• where did the particles go?
• How to prevent the particles in the first place

6
MT-TechnologyFerrule-Analysis (1)

• Insertion test MT-ferrule to MT-ferrule, to
  verify the chipping
• ferrules without housing
• no insertion loss measured
• insertion by hand
• no cleaning procedure
• visual inspection only, see att. pictures
• Dimension and tolerances of MT-ferrules,
  comparison of
• effected dimensions
• effected tolerances
• Stress calculation

7
MT-TechnologyFerrule - Analysis (2)

• Reference - Documents
• Standard Issue
• 12 Fibers TIA/EIA 604 - 5 04-07-98 Draft
• 1...4 Fibers TIA/EIA 604 - 12 08-04-98

8
MT-TechnologyDimensions Tolerances of
MT-Ferrules
9
MT - TechnologyStress-Analysis
Detail A
pressure on the face of hole
Detail A
10
MT-TechnologyStress Calculation

• Mechanical Model for the Alignment Pin

F
T
4 µm
F
l
T F x l F f x E x J x 3 / l³ E
Elasticity-Modulus (stainless steel) l
Length F Force f Deflection J
Inertia-Moment T Torque
Red marked arrows are reaction forces, which
stress the surface of the alignment holes
11
MT-TechnologyChanges for Connector to Optical
Port

• 2 Fiber connector
• MM
• alignment pins in the port shortened to lt 1 mm
  
• SM
• alignment pins in the port fixed to 2 mm /-
  0.17 mm
• added 4 ribs in the port to prealign the
  ferrule
• 12 Fiber connector
• n different designs on the market in respect
  to improve
• the optical port connectivity

12
MT-TechnologyProposal/Improvement

• Propose to Improve the existing Design
• No Change in any Interoperable Dimension
• It must fit with the installed Parts
• Proposal
• Reduced Pin-Diameter in the Stress Area
• New Pin necessary
• Verification for MM and SM necessary
• Add Chamfer at the Alignment Holes
• Additional step after polishing procedure
  necessary
• Space for dust and particles