Eccentricity/Concentricity Measurement and Tuning of Fiber Optic connectors
Combined with Angular Measurement and Tuning of PM-type Connectors
The Norland CentrocGPM Measures:
Eccentricity or Concentricity of Fiber Core w.r.t. Ferrule
Angular Tuning of Fiber Optic Connectors for Minimum Insertion Loss
Angular Measurements of Stress Applying Parts (SAP) in PM Fiber Connectors
Tuning of SAP Orientation w.r.t. Key Position for Slow,
Fast or Customized Alignments
The CentrocGPM is a specially designed microscope system with dedicated signal analysis
software and precision motion control mechanisms. The system combines the eccentricity
measurement features of our CentrocGP, together with a precision angular measurement and real-
time tuning function for PM-type fiber optic connectors. For each mode of operation, application
specific chucks and tuning fixtures are supplied. The system can be quickly switched between
different modes of operation on site by the operator.
The system is PC controlled and equipped with universal active devices (LEDs @ 475nm and
630 nm). Optical signals with superior signal-to-noise ratios are generated via Norland proprietary
optical apparatus. Digital data gathered at each mode of operation are processed by novel signal
classification and feature extraction algorithms.
In the eccentricity mode, the system performs measurements of fiber optic core eccentricity with
respect to the ferrule outside diameter of the connectors, and provides the means for angular tuning
of PC-type (post PC polishing) and APC-type (pre-APC polishing) connectors. Measurement and
tuning capabilities of the system encompass the most popular types of single mode and multimode
fiber on the market today. The standard instrument is supplied with interchangeable precision
chucks of 2.50mm and 1.25mm ferrules . Repeatability of measurements is less than 0.05µm for
eccentricity magnitude, and less than 5° for eccentricity angle.
In the PM measurements and tuning mode, the system accurately assesses the orientation of the
SAP's with respect to the key position of the PM patchcord. While the operator is continuously tuning
the fiber within the patchcord, automated measurements are accomplished and displayed in real
time. The system can be readily configured for slow, fast or any other specific angular alignments.
Measurable fiber types include Panda, Bow Tie or other customized PM classes.
Accuracy of measurements and tuning can be made within +/-0.1°.