Optical fiber properties - Technopediasite

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Friday, January 17, 2020

Optical fiber properties

Optical fiber properties : Today I will talk about some special properties of optical fiber in this article. We all know better that the single-mode optical fiber widely used in telecom sector for long distance and short distance transmission of the optical signals. This type of tests may be performed by either the fiber manufacturer or the cable manufacturer.

We work on optical fiber networks every day, but there is a lot of information that we do not know. Some information is limited to the fiber manufacturer or the cable manufacturer. Today I will discuss those information in a very brief.
Very interesting properties of single-mode optical fiber cable
Properties of single-mode optical fiber

Properties of single-mode optical fiber

Do you know what is the mode field diameter of an optical fiber? And what is the value of mode field diameter of an optical fiber?

Mode Field Diameter :
In singlemode fiber the mode field diameter (MFD) is the portion of the fiber where the most light energy travels, and is larger than the normal core diameter (ie, if the original diameter is 8um MFD 9.5). This is because some light energy travels through the cladding.

The value of the mode field diameter at 1300 nm shall be within the range of 9 –10. 10% of the specified value.

Mode Field Concentricity Error:
The mode field concentricity error shall not be more than I.0 measured at 1300 nm. it is error is the distance between the center of two concentric circles that specifies the cladding diameter and the center of two concentric circles that specify the original diameter of an optical fiber.

Cladding Diameter:
The cladding of an optical fiber is often chosen to be 125 μm, which is a standard value. While this is often irrelevant with respect to guiding properties, it can still have substantial practical significance: when fibers are thickened, they break more easily when someone tries to bend them. The cladding diameter shall be 125 ± 3 μm.

Cladding non-Circularity:
The cladding non-circularity shall not exceed 2.0%. The difference between the diameters of the two circles of an optical fiber defined by the cladding tolerance field divided by the cladding diameter.

Optical Fiber Tensile Test:
The tensile strength of the primary coated fibers shall be a minimum of 400 MPa.

Fiber Strain Proof Testing:
It is called a common technique to ensure minimum strength of optical fiber and eliminate imperfections Whose sizes are dependent on the stress applied during the proof test. In proof test, predefined The load is applied to the fiber by tensile loading. The fiber breaks at weak points and has weak parts Wiped with fiber. The proof test will guarantee a minimum power level (ie above the proof test) Stress) of fiber and lifetime.

Macro Bending Loss:
Macro bending loss shall be measured by forming 100 turns of fiber on a mandrel of 75 mm diameter . The attenuation increase shall not exceed 0.5 dB at 1550 nm.

Long Term Minimum Bending Radius:
Tenderers shall state the minimum bending radius that their fiber can sustain consistent with a 40 year life. The minimum bending radius shall be at least 35 mm.

Loss at Small Bending Radii:
In order to gain further information about the fiber's bending characteristics tenderer s shall also provide graphs of bending` diameter in mm versus attenuation (dB loop) for loop diameters of 100 mm to 10 mm in 5mm steps, at 1300 nm and 1550 nm wave lengths. These results are for information only and shall not be used for acceptance or rejection.


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