Bring the probe down close to the surface of CPW in such a way that the probe positions right above the CPW slot and move it around the slot to detect an EO signal.
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3.2 === [[NeoScan]] Optical Bench Manager Program ===
[[NeoScan]] Optical Bench Manager program monitors optimization status of the system. The optimization process finds the polarization status of the polarization controller, and saves the optimized parameters and corresponding optical powers into the files.
[[Image:icon_OBM.png|right]] Open [[NeoScan]] Optical Bench Manager program by double clicking on NeoScanOBM icon [[Image:icon_OBM_small.png]] on desktop or Windows Explorer. The user interface of the program consists of two pages: System Monitor page and Optimization Settings page (Figure 3.7). By default, the program opens up with âSystem Monitorâ page.
Keep [[NeoScan]] Optical Bench Manager program running until the end of the experiment or measurement.
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[[Image:neoscanfig_3_7.png|thumb|center|600px|<i><b>Figure 3.7</b>: NeoScan Optical Bench Manager Program.</i>]]
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[[Image:neoscanfig_3_8.png|thumb|center|600px|<i><b>Figure 3.8</b>: The total return power and the polarization power of delivered beam to the optical probe with Probe ID No. 1505 in channel 1.</i>]]
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3.2.1 ==== System Monitor Page====
When the program starts, the system detects the total return power and the polarization power in the channel, plots their variations over time and displays their numerical values in mW. Figure 3.8 indicates that channel 1 is selected to deliver the beam to optical probe with Probe ID No. 1505. The Probe ID No. is a four-digit integer number provided by EMAG Technologies Inc. The green âProbe Detectedâ indicator indicates that the probe is connected to the correct channel.
1<center>[[Image:neoscanfig_3_9. Select the channel number you want to use for the measurement using the dropdown list labeled âSelect Channelâ (png|thumb|center|600px|<i><b>Figure 3.9). âCh nâ denotes </b>: Selecting the working channel n where n = 1, 2, ⦠[[from NeoScan]] Optical Bench Manager program opens up with the âCh 1â as the default working channelwindow. </i>]]</center>
<ol><li><p>Select the channel number you want to use for the measurement using the dropdown list labeled âSelect Channelâ (Figure 3.9). âCh nâ denotes channel n where n = 1, 2, ⦠[[NeoScan]] Optical Bench Manager program opens up with the âCh 1â as the default working channel. </p></li><li><p>Enter âProbe ID No.â as the number marked on the fiber associated with the probe.</p></li><li><p>3. Press âSet Probe IDâ button to update (Figure 3.8).</p><ui><li><p>⢠When either the total return power or the polarization power is too low (less than 0.3 mW), the information panel will remind a user to correct the problem. This can be the case if the probe is not connected or is defective.</p><li></li><p>⢠When the user presses âSet Valuesâ button, the previous (existing) saved optimization parameters/voltages will be applied to the polarization controllers of the selected channel. The program will check whether the polarization state is maintained or not.</p></li></ul></li><li><p>4. To start a new probe optimization press âApplyâ button. </p></li></ol>
If the polarization is maintained, the total return power and the polarization power will lie within the specified optimized range (the default value is ±20%). In this case, âOptimization Indicator LEDâ becomes green. Otherwise, it start blinking and the information panel indicates: âPolarization is not maintained: Optimization is required.â A user can change the threshold from the box labeled âAuto Trigger Marginâ (see Figures 3.7 and 3.8). If the power difference is greater than 20%, the polarization state is found not to be maintained, therefore, the user will be prompted with a dialog window giving an opportunity to initiates the optimization process or skip the optimization by choosing âNo.â