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Variable optical attenuator (ultra low loss VOA) / Components

IDIL Fibres Optiques supplies a continuous Variable Optical Attenuator (VOA) with an unmatched high dynamic range and an ultra low insertion loss.

Variable optical attenuator (ultra low loss VOA) summary

Our VOA is tuned thanks to a micrometric screw which allows an excellent repeatability but also a very high resolution since it can be over 30 dB. IDIL developed two mechanics regarding VOA.

Actually, our product is both compatible with single and multi-mode fibers. The packaging is the same in both cases. VOA provided by IDIL has been designed to be used within the context of telecommunications and instrumentation applications. However, beyond those areas, our band held product leads to other various applications.

Furthermode, IDIL can provide fixed attenuators. Those attenuators were designed thanks to a technique entirely based on optical fibers which allows a very good behaviour towards power. Thus our fixed attenuator withstands power over 5 W.

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    • Competitive ultra-low insertion loss < 0.5 dB
    • Very high resolution
    • Return loss < 60 dB
    • Small packaging
    • Fibered solution (no free space propagation)
    • Facade layout
    • Cascadable (60 dB attenuation achievable)
    • High power handling


    • Telecommunications
    • CATV
    • EDFA
    • High power source
    • Instrumentation
    Travel mechanismManual or motorizedManual micrometerManual micrometer
    Wavelength500 to 2000 nm500 to 2000 nm500 to 2000 nm
    Attenuation range< 30 dB or custom30 dB20 dB
    Insertion loss< 0.5 dB< 0.5 dB< 0.5 dB
    Attenuation resolution< 0.05 dB (0 -10 dB)< 0.05 dB< 0.05 dB
    Polarization Dependent LossDepend on fiber type< 0.1 dB (0 -10 dB), < 0.3 dB (10 -30 dB)NA
    Polarization Mode Dispersion< 0.1 ps< 0.1 psNA
    Return loss< 60 dB< 60 dB< 40 dB
    Fiber typeSMF-28, PM, MMF, other upon requestSM, PMMM 50/125, 100/125 (contact us for other)
    ConnectorsFC, LC, SC, SMA, ST, MU, E2000, otherFC, LC, SC, SMA, ST, MU, E2000, otherFC, LC, SC, SMA, ST, MU, E2000, other
    Buffer900 µm or 2.8 mm900 µm or 2.8 mm900 µm or 2.8 mm
    Operating temperatureFrom -5°C to + 65°CFrom -5°C to + 65°CFrom -5°C to + 65°C
    Storage temperatureFrom -40°C to + 85°CFrom -40°C to + 85°CFrom -40°C to + 85°C
    Power handlingUp to 5 W> 5 W> 5 W
    DimensionsUpon request65 x 44 x 15 mm³65 x 44 x 15 mm³

    Content (motorized VOA): User guide, calibration data, USB cable, controller, power supply, input and output fiber

    How it works

    Variable Optical attenuators are commonly used to test optical parameters by temporarily adding a calibrated amount of signal loss, or installed permanently to properly match a fixed power signal. VOAs have the advantages of being stable and offering a large dynamic range > 30 dB. IDIL VOAs can be manual, motorized or cascaded.

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