Evaluating the reliability of optical connectors

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Evaluating the reliability of optical connectors Test time (h) (85°C, 85%rh, PVC sheath coating) Test cycles (-40/85°C, 1 hour each, PVC sheath coating) Test cycles (-40/85°C, 1 hour each, Hytrel ® core) Fig.8 Changes in pistoning - 8 - Espec Technology Report No20
Evaluating the reliability of optical connectors 6-4 Observation of the tip shape Fig.9 shows the results of observations made on the shape of the ferrule tip before and after the High Temperature Storage Test (Damp Heat). After 2000 hours at 85°C and 85 percent relative humidity, the surface of the ferrule tip showed signs of pitting and was rougher than before testing. This roughness did not appear on the surface of the tip after the Temperature Cycling Test, leading to the conclusion that the roughness was caused by humidity. Fig.10 shows a three-dimensional computer graphics rendition of the shape of the tip. After 2000 hours at 85°C and 85 percent relative humidity, the ferrule tip exhibited flattening distortion. However, pistoning measurements with the Ferrule Tip Condition Surveyor measured the position of the apex of the tip from the sphericity of the ferrule tip, and, using that position as a standard, calculated the amount of pistoning. Accordingly, if the position of the tip section differs from these measurements, the amount of pistoning could be greater than that calculated. (a) Initial period (b) After testing Fig.9 Ferrule tip observation (85°C, 85%rh, 2000 h) (Initial period) (-40 /85°C, 500 cycles) (85°C, 85%rh, 2000 h) Fig.10 Three-dimensional shape of the ferrule tip - 9 - Espec Technology Report No20
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Evaluating the reliability of optical connectors

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