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Method for Measuring Air Gaps on MPO Style Fiber Optics Cables in Parallel Optics Applications Disclosure Number: IPCOM000029572D
Original Publication Date: 2004-Jul-07
Included in the Prior Art Database: 2004-Jul-07
Document File: 2 page(s) / 53K

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This invention outlines a method for measuring protrusion on fiber optic MPO style connectors.

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Method for Measuring Air Gaps on MPO Style Fiber Optics Cables in Parallel Optics Applications

MPO (Multi-Terminated Push-On) style connectors with multiple array counts are gaining use in highly parallel optical applications in the market place. Controlling fiber protrusion at the transceiver interfaces is becoming critical in minimizing attenuation and controlling problems caused by interferometric noise (ref: Figure 1). Currently fiber protrusion on MPO style connectors is measured with an interferometer (ref. Figure 2). This method, although very accurate, is time consuming and impractical in a high volume manufacturing environment.

FIG 1:

Disclosed is a method to use a return loss measurement and correlate it to the amount of fiber protrusion on MPO style connectors. By definition return loss is the amount of light reflected back into a transceiver or similar device measured in dB (decibels). The return loss measurement may be made using an optical TDR (Time Domain Reflectometer) in conjunction with an optical switch (such as a Dicon switch) and interface cable to step thru each measurement on each individual fiber (ref. Figure 2).


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FIG 2:

In conventional return loss testing, the actual measurement is taken directly at the junction of the cable under test and the interface cable. For this proposed method, the return loss (amount of back reflection) must be taken at a point beyond the interf...