Expanded beam connector, junior-size, square with 1-4 channels. Built according to MIL-M83526/21 standard.

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The PROCON connectors have the best optical performance on the market. This is achieved with Micropol’s lens technology, state of the art production and alignment process.

The PROCON expanded beam connector JR SQ is the only junior-sized connector in the world with a range from 1- 4 fibers, that have approved beam size according to MIL-M83526/21 standard.


  • Built according to MIL-M83526/21 standard
  • Advanced expanded beam technology
  • Hermaphroditic interconnection
  • 1 to 4 fiber channels single- or multi mode
  • No adaptors needed
  • Low downtime field repair
  • Easy clean, no special tools


Type Single-mode (SM), Multi-mode (MM) or hybrid
Optional transmission 10Gbit/s
Insertions loss (SM) Typical insertion loss -1,0dB (1310 nm)
Maximum insertion loss -1,5dB (1310 nm)
Insertion loss (MM) Typical insertion loss -1,0dB (1300 nm)
Maximum insertion loss -1,5dB (1300 nm)
Return loss (PDL) >35dB at 1310nm or 1550nm.
Polarization dependent loss less than 0,5 dB


Coupling type Hermaphroditic
Compliant ROHS & REACH
Material Hard anodized aluminium
Alternative material Marine bronze & stainless steel
Colour Grey
Durability 3000 mating cycles
Freefall 500 falls from 1,2 meters height
Vibration 5-500Hz, 0,75mm amplitude at 10G
Shaking 390 m/S numbers of shakes 3x4000
Shock pulse length 11ms, half-sine at 35g. Numbers of axis: 3 (x, y, z)



Operating temperature -57°C to +85°C
Water immersion IP67
Air pressure <25kPa -55°C during 4h
Corrosion resistance 500h salt spray
Flammability DOD-STD-1678, method 5010


Compatible with*:

  • Fibreco Junior
  • QPC Q- Mini
  • Te Pro-Beam Junior
  • Amphenol TacBeam
  • Stratos HMA

How to clean the expanded beam connector?

This instruction covers the cleaning procedure for the expanded beam (EB) connectors and its optical interface (mating face, optical path lenses, EB insert and alignment features). These connectors are non-contacting; therefore, mating the connector without cleaning first typically will not cause permanent damage to the optic interface.