About Fiber Attenuator-Optico Communication

- Dec 13, 2018-

Working principle:


1, Air isolation technology


the transmission of light in the fiber is constrained by the law of total reflection and cannot be scattered, keeping the intensity relatively stable. once it is detached from the fiber, an air gap is added between the fiber and the fiber, and the light is scattered, causing attenuation of the light. since light is strongly scattered from the incident light into the air from the ordinary fiber, in order to control the attenuation amount to a certain extent, it is necessary to ensure the isolation distance and maintain the alignment of the fibers at both ends. a flanged fixed attenuator and an adjustable attenuator can be made by this principle. the flange type fixed attenuator uses an isolating attenuating piece to make a certain thickness of the attenuating piece according to the graph, and the attenuating piece is implanted in the flange to fix the light attenuation. the flanged tunable optical attenuator uses the principle of mechanical rotation to adjust the distance between the connectors at both ends by mechanical rotation, which can attenuate the light between 0 and 30 db.


2, Displacement misalignment technology, this method is to slightly shift the core of the two fibers to achieve the power loss effect.


by using the ordinary pigtail, the core of the two pigtails is welded in the case of misalignment with a fusion splicer, so that the eccentricity loss occurs during the transmission of the light, and a connector type fixed attenuator, also known as an online fixed attenuator, is obtained. .


3. Attenuating fiber technology, based on the absorption of light by metal ions, the attenuation fiber of the doped metal ion is developed, which has the same attenuation coefficient per kilometer as the ordinary fiber. the attenuation fiber also has a fixed attenuation coefficient, but this attenuation the coefficients are not calculated in kilometers but in millimeters. passing the attenuating fiber into the ceramic ferrule? after special processing, it can be made into a fixed anode and a negative attenuator.


4, Absorption glass method


optically polished neutral absorbing glass sheets can also be used in the fabrication of optical attenuators. using the absorption properties of light by a substance, it is made into a sheet or strip of neutral dark glass, which is placed on the optical path to attenuate the light intensity. the absorbing glass is distinguished by the transmittance t and the attenuation rate expressed in decibels. transmittance t = transmitted light intensity / incident light intensity, attenuation rate η = 1 / t, attenuation rate expressed in decibels β = 10 x log η = - 10 x logt, the attenuation rate expressed in decibels can be easily estimated the attenuation rate at the time of film combination is obtained by adding the attenuation rate decibels of the superimposed slices to the attenuation rate of the combined attenuation chip group, expressed in decibels. the sheet shape is made to have a fixed attenuation value, and the strip shape is different depending on the attenuation value of different portions of the dark substance continuously increasing in its interior. a single piece of sheet-shaped light absorbing glass can be used to make a fixed attenuator. a plurality of sheet-shaped absorbing glass can be converted into a split-compressible attenuator by roulette conversion, and the strip-shaped absorbing glass can be made into a continuously adjustable attenuator by continuous displacement.


5, Solid state light attenuation technology


the tunable optical attenuators in the form of air isolation and absorbing glass are mechanically tunable for attenuation. there are also a small number of solid-state optical attenuation techniques, such as tunable diffraction grating technology, mems technology, and liquid crystal technology. , magneto-optical technology, planar optical waveguide technology.

optically polished neutral absorbing glass sheets can also be used in the fabrication of optical attenuators. using the absorption properties of light by a substance, it is made into a sheet or strip of neutral dark glass, which is placed on the optical path to attenuate the light intensity. the absorbing glass is distinguished by the transmittance t and the attenuation rate expressed in decibels. transmittance t = transmitted light intensity / incident light intensity, attenuation rate η = 1 / t, attenuation rate expressed in decibels β = 10 x log η = - 10 x logt, the attenuation rate expressed in decibels can be easily estimated the attenuation rate at the time of film combination is obtained by adding the attenuation rate decibels of the superimposed slices to the attenuation rate of the combined attenuation chip group, expressed in decibels. the sheet shape is made to have a fixed attenuation value, and the strip shape is different depending on the attenuation value of different portions of the dark substance continuously increasing in its interior. a single piece of sheet-shaped light absorbing glass can be used to make a fixed attenuator. a plurality of sheet-shaped absorbing glass can be converted into a split-compressible attenuator by roulette conversion, and the strip-shaped absorbing glass can be made into a continuously adjustable attenuator by continuous displacement.


Optico communication provides wide variations of high quality fixed plug-in, fixed adapter, fixed in-line, variable plug-in, variable adapter, variable in-line and manual voa fiber attenuator.

besides fixed and variable optical attenuator, we also offer plug type  optical terminator for your different application. 

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