AQ2200-331A Optical Attenuator Modules

A small, lightweight variable optical attenuator providing low insertion loss
Wide attenuation range of 0 to 60 dB (SM version)

Yokogawa AQ2200-331A Optical Attenuator Module


  • Wide attenuation range:
    • 0 to 60 dB (SM version)
    • 0 to 45 dB (MM version)
  • Wide wavelength range:
    • 1200 to 1700 nm (SM version)
    • 800 to 1370 nm (MM version)
  • Low insertion loss: 1.0 dB (typical)
  • Low polarization dependence loss: 0.1 dBp-p or less
  • Monitor output (optional)
  • Configure the desired measurement system by combining AQ2200 Series modules with Yokogawa optical communications measuring instruments


  • Optical level margin analysis in bit error test
  • EDFA evaluation test (input level adjustment)
  • Variable optical attenuator (VOA) evaluation test
  • Optical output adjustment for stabilizing light source
  • PD linearity measurement
  • Transmission loss simulator for optical systems and optical devices
  • Optical equipment calibration


The AQ2200-311A is a variable optical attenuation for the AQ2200 series. When it is installed in an AQ2200 series frame controller, it allows optical output to be attenuated to any value.
The AQ2200-311A ATTN module is a variable optical attenuator capable of adjusting optical output with high precision over the wavelength range of 1200 nm to 1700 nm (SM version). The ATTN module’s output can be varied in steps of 0.001 dB over a wide attenuation range of 0 to 60 dB (SM version). In addition, this attenuator provides the low insertion loss, low polarization dependence, and high return loss needed in a variable optical attenuator for optical system test. With the optional monitor output connected to a sensor module, it is possible to create programs to precisely control the optical output power.Multi-mode version is also available.

  • Literature
  • Specifications
ATTN Module (AQ2200-311A)
Model AQ2200-311A
Wavelength Range: 1200 to 1700 nm 800 to 1370 nm
Insertion Loss: 1.0 dB (typ.)
1.6 dB or less
1.0 dB (typ.)
1.6 dB or less
Max. Attenuation: 60 dB 45 dB
Attenuation Accuracy: ±0.1 dB or less
Repeatability: 0.001 dB
Output Monitor Accuracy ———
Optical Return Loss: 45 dB or more 20 dB or more
Polarization Dependence: 0.08 dBp-p or less ——————
Max. Input Power: +23 dBm
Shutter Isolation: 90 dB or more
Optical Fiber: SMF (ITU-T G.652) MMF (62.5/125) (IEC 60793-2)
Optical Connector: Select any of FC/PC or SC/PC
Monitor Port Option
Output: -13 dB (typ.) -13 dB (typ.)
Insertion Loss: 2.3 dB or less 2.3 dB or less
Optical Return Loss: 45 dB or more
Polarization Dependence: 0.1 dBp-p or less
Dimensions: Approx. 31(W)×117(H)×321.5(D)mm, 1slot wide
Weight: Approx. 0.9 kg