An optical attenuator, or fiber 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. More information about optical attenuator at wikipedia .

A variable optical attenuator is used to trim a fiber’s optical signal power levels. Applications include leveling the power exiting an optical amplifier across a fiber’s spectrum, and protecting a photodetector at a receiver from being overwhelmed by too strong a signal

The working principle of fiber optic attenuator. Fiber optic attenuators usually produce attenuation by absorbing light, such as sunglasses that absorb extra light energy. Similarly, a fiber optic attenuator has a working wavelength range that can absorb light energy.

fixed optical attenuator & variable optical attenuator

Newport’s Single-Mode Fixed Fiber Optic Attenuators offer low return loss, high mode stability and a variety of attenuation values: 3, 5, 10, 15 and 20 dB.

Compact and rugged adaptor style attenuators
Low return loss
High mode stability
Variety of connector styles

Fiber optical attenuator, or fiber 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.