Our fiber optic Clip On Variable Attenuator is a completely passive device, which works by physical attenuation of 3mm jacketed singlemode cable. It can be attached at any point in a cable, providing attenuation levels from 0 to >47dB at 1550nm, or 0 to >21dB at 1310nm. This device is good for hundreds of uses, and it leaves no lasting effects on your cable. Since this attenuator does not require connectors, it is a great way for you to achieve attenuation without producing back reflections. The unit measures 1 1/2 inches long, and has a 3/4 inch diameter. Some of the things to determine when choosing an attenuator include attenuation range, wavelength range, resolution, and any polarization dependent loss (PDL) requirements. We offer many attenuator styles, so you are sure to find one suited to your needs and preferences. For example, we offer In-Line Fixed, Collimator Variable, Air-Gap Variable, 3-Step, and Washer-Style attenuators.