Working principle of variable optical attenuator
Optical attenuators can take a number of different forms and are typically classified as fixed or variable attenuators.
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Inside the optical attenuator
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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Wavelength of Optical Attenuator
Wavelength: single mode 1310um, 1550um or dual wavelength; multimode 850um or dual wavelength, equipped with dust cap. 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.
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Why add an optical attenuator
Optical attenuators are commonly used in, 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. They are usually installed at the transmit end of active modules, such as OTU and OSC boards, to prevent the downstream receiver modules from being burnt due to excessively high output optical power. Transmitter power (TP) = 3dBm Receiver maximum optical input power (MP) = -6dBm Total losses (TL) = 5dB Minimum attenuation required = MP + TL – TP = -6dBm + 5dB – 3dBm = – 4 dB At a minimum, a 4 dB attenuator is required.
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Venezuelan Lateral Displacement Type Optical Attenuator
An optical attenuator, or fiber optic attenuator, is a device used to reduce the level of an optical, either in free space or in an.
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