Fixed Attenuator
Fixed Attenuators are designed to have an unchanging level of attenuation. They can theoretically be designed to provide any amount of attenuation that is desired. The output signal is attenuated relative to the input signal. Fixed attenuators are typically used for single-mode applications.
Stepwise Variable Attenuator
A stepwise variable attenuator is a device that changes the attenuation of the signal in known steps such as 0.1 dB, 0.5 dB, or 1 dB. These attenuators may be used in applications dealing with multiple optical power sources. For example, if there are three inputs available, there may be a need to attenuate the signal at a different level for each of the inputs. Conversely, they may also be used in situations where the input signal is steady, yet the output requirements change depending on the device that the signal is output to. Note: The stepwise variable attenuators should be used in applications where the inputs, outputs, and operational configurations are known.
Continuously Variable Attenuator
A continuously variable attenuator is an optical attenuator that can be changed on demand. It generally has a device in place that allows the attenuation of the signal to change as required. Continuously variable attenuators are used in uncontrolled environments where the input characteristics and/or output need continually change. This allows the operator to adjust the attenuators to accommodate the changes required quickly and precisely without any interruption to the circuit.
According to the different connector types, there are several types of optical attenuators: LC Attenuator, SC Attenuator, ST Attenuator, FC Attenuator, E2000 Attenuator etc., available in UPC/APC polish types.
Packaging of Optical Attenuators
Optical attenuators typically come in two forms of packaging: Bulkhead Attenuator and In-Line Attenuator. The bulkhead optical attenuators can be plugged into the receiver receptacle. The in-line optical attenuators resemble a fiber patch cord and is typically used between the patch panel and the receiver.
