Fiber-coupled Attenuator 48AT-0

Compact, rugged and highly efficient opto-mechanical unit for interconnecting two fiber cables

48AT-0
48AT-0
48AT-0
48AT-0

Features

Fiber-coupled Attenuator
  • For single-moder or PM fiber cables
  • Insertion loss typically 1.5 dB, extinction > 60 dB
  • Adjustable
  • Compact, rugged, transportable and sealed opto-mechanical units
  • Very high long-term stability, efficiency and reproducability
  • Can be used as interface between different types of single-mode fibers or connectors

Description

Laser Attenuator 48AT-0 is used for reproducible and precise reduction of the power output by the laser. The collimated laser beam is constricted by a precision ball transported by a scaled micrometer screw. The subsequent single-mode fiber coupling is used as a mode filter.
This mechanically stable attenuation method allows the precise and reproducible setting of the laser power output over a wide range (typically 1.5 to > 60 dB). Unlike a power regulation by modulation of the laser current, the wave-length and polarization status of the laser beam are preserved.

A reproducible power attenuation is only assured for singlemode fibers that have a Gaussian intensity profile.

Fiber Couplers
A fundamental component of the Fiber-to-Fiber Coupler is the Laser Beam Coupler, which is the input into the opto-mechanical unit collimating the input radiation and, finally, couples the radiation back into the second fiber cable. The stability of the total Fiber-to-Fiber Coupler is determined by the stability of the laser beam coupler.

Coupling focal length
The best focal length for the 60SMS Laser Beam Couplers used in these systems is f' 11 - 12 mm. If the effective numerical apertures of the two fiber used with this system are different, you have to use two Laser Beam Couplers with different focal lengths.

Configuration
For selecting the 60SMS Laser Beam Couplers please refer to the 60SMS Laser Beam Couplers site

Technical data

Fiber-coupled Attenuator 48AT-0

Order code
48AT-0
Wavelengths
370 - 1700 nm. monochromatic*
Focal length
11 mm (standard)
Fiber type
single-mode or polarization-maintaining
Connector type
FC APC (standard)
Attenuation
1.5 dB to > 60 dB @ 780 nm
* Broadband systems on request
Weight
360 gr

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Accessories

Eccentric key with a stroke of ± 0.5 mm.
Screwdriver WS 1.2
Hex key WS 1.5