MEMS Variable Optical Attenuator

MEMS variable optical attenuators (VOA) are high-quality VOAs based on industry-proven MEMS mirror technology. They work by collecting and collimating light from the input fiber, then reflecting this light through an ultra-stable and reliable single-axis MEMS mirror. The reflected light is guided to the output fiber, and precise attenuation is achieved through partial misalignment coupling.

MEMS micromirror-type VOAs are the most common type. They work by using electrostatic force to deflect the MEMS micromirror, thereby changing the path of the light beam and causing a mismatch between the optical signal and the fiber mode field, thus achieving attenuation.

The specific process is as follows: The input optical signal passes through a collimator and then illuminates the MEMS micromirror. The micromirror deflects under the action of electrostatic force, changing the path of the reflected light. The larger the deflection angle, the more severe the mismatch between the optical signal and the fiber mode field, and the greater the attenuation. Furthermore, MEMS micromirror-type VOAs also suffer from wavelength-dependent loss (WDL), meaning that the attenuation varies depending on the wavelength of the optical signal.

Advantages of MEMS optical attenuators: High quality and reliability; Excellent optical performance; Lifespan > 10 billion cycles; Mature MEMS mirror technology; Available in SMF-28, HI1060, PM980, 780HP, PM780, 630HP, PM630, and 460HP models.