Gracyfiber Variable optical attenuator for Test equipment and EDFA
Apr 11, 2023| Variable Optical Attenuator
Description: Variable Optical Attenuator (VOA), as an optical passive device, is used for debugging optical power performance in optical communication systems, debugging calibration and correction of optical fiber instruments, optical fiber signal attenuation, and can adjust optical power to desired required level to avoid distortion of the optical receiver due to excessive input optical power
How VOA works
Light enters from an optical fiber, is collimated by a lens, the MEMS reflects the collimated light, and then enters an output optical fiber. The voltage drives the MEMS to rotate, causing the output light spot to deviate from the core of the output fiber. The magnitude of the voltage affects the energy of the light spot in the output fiber, so that the channel attenuation can be adjusted.
Application of optical attenuator
Optical attenuators are widely used. Variable optical attenuators can be combined with optical devices such as wavelength division multiplexer (WDM), optical splitter detector (TAP PD), and erbium-doped fiber amplifier (EDFA) to form ROADM, VMUX, and gain-flat EDFA. And other modules can also be directly used for overload protection of optical receivers. In addition, the measurement and calibration of instruments such as optical power meters also need to use VOA.
■ Test equipment
■ Fiber optic communication (EDFA)
■ Fiber optic communication (DCI/DCO)
In addition, it will also be used to balance the signal gain of each wavelength for BA front-end; in the line, WDM system power control; closed-loop output power control; optical detection end power protection, etc.