About Optical Attenuators
An optical attenuator, or fibre optic attenuator, is a device used to reduce the power level of an optical signal, either in free space or in an optical fiber. The basic types of optical attenuators are fixed, step-wise variable, and continuously variable.

Ceyear 6383 Adjustable Optical Attenuators
Wavelength range of 1200nm - 1650nm
The Ceyear 6383A/B can perform 0dB - 65dB attenuation for any optical signals within the wave length range of 1200nm - 1650nm.