SANWA offers Advanced Variable Attenuator devices for use in optical systems for in-line power control, transmitter power equalization, and R&D purposes. It features high resolution, low insertion loss, and low polarization and wavelength-dependent loss. Customized designs are also available according to specialized feature applications. The attenuator has a variable attenuation range of 30dB at wavelengths of 1310nm and 1550nm. It operates between -15 to 60 degrees Celsius and stores between -40 to 70 degrees Celsius.


  • High-resolution control of attenuation
  • Low insertion loss
  • Low Polarization Dependent Loss (PDL)
  • Low Wavelength Dependent Loss (WDL)
  • Customizable design according to application needs
  • Variable attenuation range of 30dB at 1310nm and 1550nm wavelengths
  • Operational temperature range of -15 to 60 degrees Celsius
  • Storage temperature range of -40 to 70 degrees Celsius


  • In-line power control in optical systems
  • Transmitter power equalization
  • Research and development (R&D) purposes

Variable Attenuators

Variable Attenuator

Used in In-line Power Control in Multi-channel Optically Amplified Systems, Transmitter Power Equalizationand, and Laboratory R&D, the SANWA Variable Optical Attenuators feature high resolution and convenient manual adjustment. It has low insertion loss, low wavelength-dependent loss, and low polarization-dependent loss. It is designed for pre-emphasis attenuation, detector saturation control, in-line power equalization, and amplifier power control.

Customized designs to meet specialized feature applications are also available.

Mini Manual Variable Attenuators

Mini Manual Variable Attenuators

SANWA's Mini-type Manual Variable Optical Attenuator (MVOA) operates by manually moving a shading element into an optical beam. The shading element can be integrated and adjusted to get any attenuation value in a range. MVOA features low insertion loss, good resolution, high stability, and good reliability. It is applied for pre-emphasis attenuation, transmitter power control, in-line power equalization, and amplifier power control.

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