Optical attenuator is a very essential fiber optic passive additives. It’s an necessary device for fiber CATV. So far the marketplace has shaped 4 series which can be fixed-step, variable, continuously variable and smart optical attenuator.
Types of Optical Attenuators
A. Displacement Optical Attenuator
As all of us understand, when the 2 sections of optical fiber connection, have to meet a without a doubt excessive accuracy, in an effort to make the optical signal a smaller loss transmission previously. Conversely, when the fiber to help make the proper changes within the precision, you could manage the quantity of attenuation. Displacement-kind optical attenuator is based totally on this principle, the purpose of the fiber in the butt, the appearance of positive dislocation. The sunshine electricity loss, for you to attain the purpose of a controlled amount of attenuation, the displacement-type optical attenuator is split into two types: the lateral displacement kind optical attenuator, the axial displacement of the optical attenuator. The lateral displacement from the optical attenuator is a classical method, due to the significance from the lateral displacement parameters within the micron stage, so generally do no longer should produce a variable attenuator is used simplest for producing fixed attenuator, and the use of welding or stick connection, there may be still a great marketplace, the advantage of high return loss, typically more than 60 dB. Axial displacement kind optical attenuator by using mechanical manner so long as the procedure layout of two optical fibers a sure distance with the goal, is possible attenuation. This precept is specially employed for generating fixed optical attenuator and a few small variable optical attenuator.
B. Thin-film Optical Attenuator
This attenuator is created whilst using precept of sunshine within the contemplated mild awareness of the top of metallic thin movie film thickness. When the thickness from the metal thin movie deposited around the glass substrate is sure, fabricated from a hard and fast optical attenuator. Different attenuation may be obtained if inner a exceptional thickness of a disk-shaped metallic thin wax glass substrate, metallic skinny film, so that inserted in the optical street to unique thicknesses so that you can alter the intensity of the reflected mild inside the optical fiber inserted obliquely deposited Cover made from the variable attenuator.
C. Attenuation-sheet Optical Attenuator
Attenuation the chip kind optical attenuator at once constant attenuator thru an absorption characteristic in the long run surface of the optical fiber or maybe the optical direction to reap the reason for the attenuation from the optical sign, this manner cannot surely be used to supply a fixed optical attenuator also can be used to supply the variable optical attenuator.
Applications of Optical attenuators
A set optical attenuator fixed amount of attenuation of the optical road to the sunshine energy is principally used for its remarkable temperature traits. Within the commissioning from the system, widely utilized in analog optical signal thru the corresponding duration of optical fiber attenuation or reduce the margin from the optical strength the relay station can also be used to save you saturation from the optical receiver; optical test tool calibration scaling. For different line interface, you can use exclusive fixed attenuator; if the interface is without a doubt a pigtail type available pigtail type optical attenuator welded in the direction of the optical route between the two sections of fiber; If you're debugging the system connector interface converter or inverter-type constant attenuator.
In sensible applications regularly require attenuation amount of the optical attenuator can be modified the use of the user needs. Therefore, a much wider range of making use of the variable attenuator. For instance, EDFA, CATV optical machine layout margin of the specific product is not quite the identical, the optical strength margin of the gadget BER assessment, to prevent the receiver is saturated, it have to be inserted in the gadget variable optical attenuator, some other , fiber optics (together with a electricity meter or OTDR) dimension, calibration will also make use of the variable attenuator. From the perspective of market call for, on the one hand, the optical attenuator improvement closer to miniaturization, serialization, low charge course. However, because of the common type optical attenuator, optical attenuator is development path closer to excessive-performance, clever optical attenuator, excessive return loss optical attenuator.
Source: 10GtekStore
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