Variable (adjustable) fiber optic attenuator with continuous attenuation control for precise optical power management. Supports single mode and multimode fiber systems for network testing, FTTH optimization, and laboratory. PM Version Available; 630 to 1550 nm; Fiber Type SM, MM, PM (PANDA); Connector Type FC/UPC, FC/APC, other; Attenuation 0. These VOAs can be used to precisely balance signal strengths in fiber optic circuits.
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Optical attenuators are critical devices used in managing the intensity of optical signals in fiber optic communications. Key requirements include minimal effect on the beam profile, low wavelength and polarization dependence, and sufficient power handling capability. The attenuator circuit will allow a known source of power to be reduced by a predetermined factor, which is usually expressed as decibels.
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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. The power reduction is done by such means as absorption, reflection, diffusion, scattering, deflection, diffraction, and dispersion, etc.
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The PIN tube has the characteristics of low on-resistance, high off-resistance, and small capacitance between electrodes. So generally it can be used as SWITCH, and the design of adjustable attenuator; Manufacturers such as skyworks, Rohm, and nxp all sell PIN tubes. ttenuator with a low impedance driver circuit to significantly decrea the rise and fall times. At high frequencies, the lowering of attenuation- (at consta t bias) is primarily due to capaci frequency high attenuation operation.
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Attenuators are usually passive devices made from simple voltage divider networks. Switching between different resistances forms adjustable stepped attenuators and continuously adjustable ones using potentiometers. A 3 dB pad reduces power to one half, 6 dB to one fourth, 10 dB to one tenth, 20 dB to one hundredth, 30 dB to one thousa.
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