# Acceleration of Service Life Testing by Using Weibull Distribution on Fiber Optical Connectors
## 3 Validation of the Procedure
### Accelerated Vibration  
Once the vibration ALT was defined (see Table 3), it was carried out by the same PM250 HP shaker and power amplifier with an MB dynamic controller, using the same fixture on the vibration shaker that held the fiber optical connections. The fiber connectors submitted to testing were the two samples that met the completed service life testing, and two new samples without any previous stress that were indicated as per the standard GMW8758 [30]. The samples were tested to failure at the vibration ALT stress and the time to failure was recorded for each sample. The insertion loss measurements of the fiber optical connectors under test were taken by making the connections as per Figure 1, with the fiber optic connectors in a mated pair configuration formed by standard fiber angled PC adapters. The samples were connected to the Agilent N7745A equipment with an 8-channel optical multiport power meter, with a speed measurement data acquisition and transfer of 5 kHz per channel and with event detection in a wavelength range from 1310 to 1550 nm.  
The vibration ALT is performed to demonstrate the product's reliability when it has not been submitted to previous service life testing. With that information, the accelerated vibration test was conducted, and its results are presented in Table 4.  
To determine a product's Weibull reliability, the failure time needs to be deaccelerated. This test was conducted using Equation (31), which multiplies the adjustment factor 1.572 from Equation (30) by the failure time in Table 4. The results are shown in Table 5.  
Time deaccelerated \[=\text{adjustment factor}\times\text{failure time}\] (31)  
The experimental results are presented in the next section.  
\begin{table}
\begin{tabular}{c c c c} \hline \hline
**Sample ID** & **Failure Time (H)** & \
\begin{tabular}{c} **Requirement** \\ **(dB)** \\ \end{tabular} &
\begin{tabular}{c} **Result** \\ **(dB)** \\ \end{tabular} \\ \hline
1 (service life  survived) & 4.00 & 0.400 & 0.464 \\
2 (service life  survived) & 5.00 & 0.400 & 0.561 \\
1 (new Sample  without service life) & 66.00 & 0.400 & 0.876 \\
2 (new Sample  without service life) & 63.00 & 0.400 & 0.509 \\ \hline \hline \end{tabular}
\end{table}
Table 4: Accelerated vibration failure times.  
\begin{table}
\begin{tabular}{c c c c c c c} \hline \hline
**\(f_{1}\) (Hz)** & \(PSD_{i}\) (G2/Hz) & **dB** & **Oct** & **m (dB/Oct)** & **Area (\(A_{i}\))** & **Grms** \\ \hline
16,599 & 0.004 & 0.000 & 0.000 & 0.000 & 0.000 & \\
33.197 & 0.020 & 6.990 & 1.000 & 6.990 & 0.180 & \\
49.796 & 0.060 & 4.771 & 0.585 & 8.156 & 0.626 & \\
66.394 & 0.140 & 3.680 & 0.415 & 8.866 & 1.599 & \\
82.993 & 0.300 & 3.310 & 0.322 & 10.282 & 3.534 & \\
91.292 & 0.400 & 1.249 & 0.138 & 9.086 & 2.891 & \\  & & & & & 8.833 & 2.972 \\ \hline \hline \end{tabular}
\end{table}
Table 3: GR-326 accelerated vibration profile.  
\begin{table}
\begin{tabular}{c c c} \hline \hline
**Samples ID** & **Failure Time (H)** & \
\begin{tabular}{c} **Requirement** \\ **(dB)** \\ \end{tabular} &
\begin{tabular}{c} **Result** \\ **(dB)** \\ \end{tabular} \\ \hline
1 (service life  survived) & 4.00 & 0.400 & 0.464 \\
2 (service life  survived) & 5.00 & 0.400 & 0.561 \\
1 (new Sample  without service life) & 66.00 & 0.400 & 0.876 \\
2 (new Sample  without service life) & 63.00 & 0.400 & 0.509 \\ \hline \hline \end{tabular}
\end{table}
Table 4: Accelerated vibration failure times.