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EVA50 Optical Variable Attenuator

Single Mode Attenuator

EVA 50 Optical variable attenuator is a compact and rugged portable attenuator with attenuator range options of 40dB, 60dB or 80dB (to be specified at time of ordering) to help reduce and control the output level of an optical signal in an optical fiber. EVA series digital optical variable attenuators can apply attenuation value from 0.1 dB upto 60dB (or 40dB/80dB).

Product Specification

Module Options | EVA50 +




Attenuation Range

40 dB (SM)

60 dB (SM)

80 dB (SM)

Calibrated Wavelengths (nm)

1310/ 1490/ 1550

Fiber Mode

Single Mode (SM), Simplex

Attenuating Mode


Display Resolving Power



LCD, 128 x 64

Max Input Power

< + 21 dBm

Return Loss

> 40 dB

Insertion Loss

< 2.5 dB

Connector Adaptor

FC/PC (or customize)


± 0.5 dB


± 0.2 dB

Adjustable Wavelength Range


Display Type

LCD display

Auto Power Off

Yes (Settable 1 to 10 minutes)

Battery Charge


Battery Life

≥ 20 hrs

Power Supply

3 * AA batteries or AC/DC adaptor

Size (mm)

190 x 90 x 40

Weight (g)

About 450

Storage/ Operating Temperature/ Relative Humidity

-20°C to +60°C/ -10°C to +50°C/ < 90%RH

Standard Accessories

Carrying bag, calibration certificate, manual, packing box

Optional Accessories

AC/DC adaptor

  • Apply attenuator value in steps of 0.1dB, 1.0dB or 10dB
  • Three wavelengths: 1310nm/ 1490nm/ 1550nm
  • Different attenuator range, 40dB, 60dB or 80dB
  • Can save current value as reference and recall
  • Can save 8 records
  • Energy save mode
  • Three-year recommended calibration interval
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