Military Aerospace

Aerospace: science and technology including aeronautics (atmospheric transportation) and space (transportation outside of atmosphere or interplanetary).

Laser light transmission.

Optical fiber is generally used for point to point link. One side is connected to a laser and the other side to a lens or a collimator adapted to free space transmission.

Examples: Atomic clock PHARAO, MTG, SWARM.

The technical constraints besides optical system definition comes from the necessity to cope with vibration, acceleration and outgassing on a mixed fiber and free space system.

Space spectrometer link

Typically a fiber optic bundle designed to transmit the light between the focal point of a space telescope and a spectrometer.  (see documentation on Astronomy / Telescope)

Examples: BepiColombo PHEBUS, R&T II.

Technical constraints are numerous. They include the problematic of ground telescopes, reliability, focal ration degradation as low as possible, percentage of broken fibers<1%, plus all constraints of space conditions, weight, low outgassing, radiation resistance, temperature range, acceleration, vibrations.

Space Technical constraints

  • Vacuum up to 10-8 mbar
  • Acceleration up to 20G
  • Outgassing
    • TML (Total Mass Loss) <1%
    • RML (Recovered Mass Loss) <1%
    • CVCM (Collected Volatile Condensable Material) <0.1%
  • Temperature: from 2.7 K to 423 K (-270°C to +150°C)
  • Radiations: from a few tenth of KRads to 200 KRads

Achievements / Products

Using optical fibers in harsh or even extreme environment implies specific design to operate in conditions such as radiations, high temperature, high pressure or very diverse mechanical constraints. Products are designed according customer’s specifications and manufactured under ISO 9001 quality process.