Optical attenuators are passive device commonly used in fiber optic communications, either to test power level margins by temporarily adding a calibrated amount of signal loss, or installed permanently to properly match transmitter and receiver levels. Sharp bends stress optic fibers and can cause losses. If a received signal is too strong a temporary fix is to wrap the cable around a pencil until the desired level of attenuation is achieved. However, such arrangements are unreliable, since the stressed fiber tends to break over time.

Parameters	FC,SC, LC, ST, MU, DIN, E2000, MTRJ, Hybrid
Attenuation Range	0dB ~ 30dB SM: 1260-600nm, or 1310nm/1550nm
Operation Wavelength
	MM:850nm, 1310nm
Return Loss	≤50dB (PC)
	≤55dB (UPC)
	≤65dB (APC)
Attenuation Accuracy	±0.5dB (1 ~ 10 dB)
	±10% of Attenuation Value  (11~30 dB)
Polarization Dependent Loss (PDL)	≤0.2dB
Exchangeability	≤0.2dB
Repeatability	≤0.2dB
Durability	≤0.2dB Typical 1000 matings
Maximum Optical Input Power	200mW
Operating Temperature	-20 ~ +75°C
Storage Temperature	-40 ~ +85°C