Variable Optical Attenuator, Multi Mode

The KI 7020B hand held Fiber Optic Variable Attenuator is a precision handheld instrument commonly used for testing 50u multimode mode fiber sytems for optical system margin and linearity. Superior specifications, high productivity and remote control capability also make this a genuine laboratory grade instrument.


  • Premium class automatically regulated attenuator, intuitive to use, durable and reliable
  • Maximum attenuation: 60dB
  • Minimum residual insertion loss,
  • Calibration on: 850, 1300nm
  • Interchangeable adapters, version / PC
  • High contrast display
  • Excellent linearity and absolute accuracy,
  • Programmable (steps, range),
  • Possibility to control via an external computer,
  • Long battery life
  • Optional external power supply

Additional information

Calibration validity (ISO17025)

3 years

Fiber type

50 /125 µm


3.0 ~ 60.0 dB


0.05 dB

Linearity / Repeatability

0.03 dB

Absolute uncertainty

0.3 dB

Power capability

+30 dBm

Optical return loss (ORL)

60 dB

Polarization dependent loss (PDL)

< 0.1 dB

Thermal stability over temperature

±0.02 dB

Operating wavelength range

700 ~ 1400 nm

Nominal Calibration wavelengths

850, 1300 nm

Wavelength dependence (850 ~ 1300 nm)

< ±0.5 dB up to 20 dB


RS232 (3.5mm jack connector, default baud 9.6K)


batteries or external

Battery type

2x C (R14) Alkaline

Battery life

7.6 A/Hour

External power

9~12 V DC with ID2.5mm(+ve)-OD5.5mm-plug


Polycarbonate, 1-meter drop tested, with captive caps


190 mm x 130 mm x 70 mm