Why Patch Cord need to pass 3D test?

3D test is a regular requirement in the Telcordia-GR326-CORE and IEC standards. The main purpose to pass 3D test is to make sure Patch cord ferrule meet the following the requirement:

1. ROC

The radius of curvature is defined as "near the point on the curve coincides with the maximum radius of the arc." The radius of curvature of the end face-to-face means the radius of the ferrule axis, that is, the curve radius of the ferrule end face. The radius of curvature of the compression force is controlled to maintain the fiber center matches the force. The radius of curvature increases or decreases the fiber failure of the pressure, the aging effect of matching will eventually lead to the fiber center spacing.

2. Apex Offset

Ferrule end face apex offset is the highest point of the curve to the distance of the axis of the fiber core. Offset will increase if large insertion loss and return loss, affect the connection results.

3. Fiber Height

Height is the height of optical fiber core fiber ferrule end face to face in the distance. Fiber height this indicator

is used to measure optical fiber and fiber optic contacts, when the material expands or shortened fiber

depressions will form an air gap between the fiber contacts, change the insertion and return loss. Fiber height

between the fibers will increase the pressure, thus damaging the fiber; the pressure will be passed to the

fixed optical fiber or the material, thereby fixing the fiber damage and affect the performance and stability.