Where is the MTP connector optimized?
Where is the MTP connector optimized?
(1) The guide pin of the MTP connector is a stainless steel ellipse, which can improve alignment accuracy and reduce wear on the guide hole.
In the traditional MPO connector, although the guide pin has been chamfered, the surface of the needle head is still very sharp. Repeated insertion and extraction will cause cracks or damage to the end surface near the guide hole, which will affect the stability of the connector insertion loss. The figure below is a comparison of the reliability test of MTP and MPO connectors. After 600 times of plugging and unplugging of the MTP connector, the end face near the guide hole is basically intact; after 500 times of plugging and unplugging of the MPO connector, the end face near the guide hole has Visible damage.
MTP and MPO connector plug reliability test comparison
[from: Literature 3]
(2) The spring design of the MTP fiber optic connector maximizes the ribbon gap for multi-core ribbon fiber applications, thereby preventing fiber damage.
The following figure is a comparison of the internal structure of MTP and MPO connectors. We can see that the spring section design of MTP is not a conventional circular design, but an elliptical design, which can maximize the space for the ribbon fiber and reduce the impact of spring activity during insertion. Fiber damage.
In addition, there is a groove on the fixing clip of the guide pin of the MTP connector, which can fix the spring in the groove and center the spring force.
Comparison of the internal structure of MTP and MPO connectors
[from: Literature 4]
(3) The guide pin fixing clip designed by the MTP connector can prevent the loss of the guide pin.
(4) The outer frame sleeve of the MTP connector can be disassembled. The advantages of this are: 1. It is convenient for the MT ferrule to be reworked and ground during production to ensure that the performance is not compromised; 2. It is convenient for the polarity of the MTP connector to be flexibly changed after production and assembly; 3. The interference check of the ferrule assembly.
(5) The MTP connector allows the MT ferrule to float in the outer casing, which improves the mechanical performance. In this way, when two MTs are plugged together, a certain external force will not change the physical contact between the two end faces, and the optical performance will not be degraded as much as possible.
MTP connectors allow MT ferrule to float within housing frame
[from: Literature 5]
- What performance needs to be paid attention to
- Optical performance index
According to the national standard YD/T 1272.5-2009,
(1) Optical index of MPO single-mode connector plug
Insertion loss(dB)
Return loss(dB)
Connection via standard adapters and standard connectors
≤0.8
>30 (MPO/PC)
>50 (MPO/APC)
Two connectors can be connected freely by adapter
≤1
>20 (MPO/PC)
>40 (MPO/APC)
(2) Optical index of MPO multimode connector plug
Insertion loss(dB)
Return loss(dB)
Connection via standard adapters and standard connectors
≤0.7
Not defined
Not defined
Two connectors can be connected freely by adapter
≤1
Not defined
Not defined
- End Geometry
The national standard YD/T 1272.5-2009 only stipulates the technical indicators of the end face geometry of the standard plug used as a test reference, and does not specify the plug to be tested.
Referring to the international standard IEC 61755-3-31:2015, the main technical indicators of the end face are as follows:
project
standard value
X-axis grinding angle Ferrule Surface X-Angle (°)
-0.15 to +0.15
Y-axis grinding angle Ferrule Surface Y-Angle (°)
-0.15 to +0.15
Y-axis grinding angle Ferrule Surface Y-Angle (°) (APC)
7.8 to 8.2
Fiber Height (nm)
1000 to 3500
Fiber Differential Height-Adj. (nm)
≤300
Minus Coplanarity (nm): The fiber height difference between the lowest fiber and the best fitting fiber plane
≤400
X-axis curvature radius Ferrule Surface X-Radius (mm)
≥2000
Ferrule Surface Y-Radius (mm)
≥5
Fiber Tip Spherical Radius (mm)
≥1
Geometry Limit (more complicated, used to evaluate the MPO end face)
≤17.4
Finally, if you want to conduct a detailed test on the MPO fiber optic connector, you can refer to the national standard YD/T 1272.5-2009 and GR-1435-CORE, mainly including appearance, temperature and humidity, mechanical and other tests.
