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Specifications of Variable Optical Attenuator

Fiber optic adapter knowledge brief Published 24 Jun 2024

Prepared for preliminary research by the DANI ALONSO OPTICAL knowledge desk. Confirm connector interfaces, sleeve materials, polish, loss budgets and installation requirements against current standards and product documentation.

Variable Optical Attenuators (VOAs) are adjustable devices that control optical power in fiber or free-space systems, available in MEMS, filter-based, and fiber-coupled designs with specifications tailored for precision, speed, and wavelength range.Overview of VOAs

A Variable Optical Attenuator is a device that reduces optical power in a controllable manner, unlike fixed attenuators which provide constant loss. VOAs are essential in optical communications, laser instrumentation, and laboratory testing, allowing precise adjustment of signal levels, testing of bit error rates, or stabilization of laser output power .

Common VOA Models and Technologies
  1. MEMS-Based VOAs
    • Operate using micro-electromechanical mirrors to partially misalign light between input and output fibers.
    • Offer high reliability, long life, and GR-1221 qualification.
    • Suitable for OEM, test, and measurement applications.
    • Example: DiCon MEMS VOA, which provides precise attenuation control and can be customized for specific applications .
  2. Filter-Based VOAs
    • Use a neutral density filter moved by a stepper motor to vary attenuation.
    • Provide stable, linear attenuation across multimode fibers.
    • Ideal for laboratory and metrology applications.
    • Example: Viavi MAP series mVOA-C1, offering programmable attenuation, low insertion loss (

Specifications of Variable Optical Attenuator - DANI ALONSO OPTICAL CONNECTIVITY [PDF]

Specifications of Variable Optical Attenuator

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This reference is intended for preliminary fiber optic adapter research. Compatibility, link budgets, connector interfaces, sleeve materials, polish, installation methods, test limits and applicable standards must be verified for the specific project.

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