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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Standard attenuation values are 5, 10, 15, and 20 dB, available in SC, FC, ST, and LC connector styles. Using no air gap, filters, or light path discontinuities, attenuation is achieved by controlled absorption of light energy. OZ Optics offers a compact, rugged and low cost digital attenuator with high resolution, high speed, high attenuation range and high power han-dling (blocking technique only). The product range comes with extremely low return loss and high-quality ceramic ferrules that will deliver in the most demanding applications and ensure repeatable performance.
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As light in fibers often does not have a well defined polarization state, it is important that a fiber-optic attenuator exhibits only a minimum amount of polarization dependence. Generally, the obtained insertion loss has some dependence on the optical wavelength. For multimode devices, however, some loss difference is possible in conjunction with a mode dependence.
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In practice, you simply insert an attenuator between two fiber connectors or within a patch panel port. Optical attenuators serve a deceptively simple function-reducing signal power to prevent receiver saturation-yet their proper installation demands attention to details that many technicians underestimate. Match the fibre type (single-mode or multi-mode) with the correct connector type (SC, LC, FC, etc.
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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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