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ffc:locking_electronics:slice-fpga-ii [2023/06/09 20:58] – external edit 127.0.0.1ffc:locking_electronics:slice-fpga-ii [2023/07/05 17:44] – external edit 127.0.0.1
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 Click here for the [[http://www.vescent.com/manuals/doku.php?id=manuals|Main Manuals Page]].\\ Click here for the [[http://www.vescent.com/manuals/doku.php?id=manuals|Main Manuals Page]].\\
 Click here for the [[ffc:100|FFC-100 Quick Start Guide]].\\ Click here for the [[ffc:100|FFC-100 Quick Start Guide]].\\
-Click here for the [[ffc:100m|FFC-100 Fiber Frequency Comb Manual]]\\+/*Click here for the [[ffc:100m|FFC-100 Fiber Frequency Comb Manual]]\\ */
 Click here for the [[ffc:100:API|FFC-100 API]].\\ Click here for the [[ffc:100:API|FFC-100 API]].\\
  
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 ==== Locking ƒ(CEO) ==== ==== Locking ƒ(CEO) ====
   -Navigate to the “CEO Lock” tab and enable the “Auto-refresh” button in the top left of the window. Set your desired RF lock frequency of the Fceo beatnote in the “Reference Frequency [Hz]” input. Adjust the “Offset DAC 0” slider near the top left by clicking and dragging the slider until the Beatnote is roughly centered in the red filter trace (<imgref ceo_bbiq>). It is also possible to adjust the FFC-100 oscillator current on its front panel to make this adjustment.    -Navigate to the “CEO Lock” tab and enable the “Auto-refresh” button in the top left of the window. Set your desired RF lock frequency of the Fceo beatnote in the “Reference Frequency [Hz]” input. Adjust the “Offset DAC 0” slider near the top left by clicking and dragging the slider until the Beatnote is roughly centered in the red filter trace (<imgref ceo_bbiq>). It is also possible to adjust the FFC-100 oscillator current on its front panel to make this adjustment. 
-  -Note: If parts of the FPGA GUI window are cutoff, shift the window out of full screen and press the maximize window button.<imgcaption ceo_bbiq|Centering ƒ(CEO) on reference frequency (Baseband IQ optimization)>{{ :ffc:locking_electronics:fceo_2_centered.png?800 |}}</imgcaption>\\ +  -Note: If parts of the FPGA GUI window are cutoff, shift the window out of full screen and press the maximize window button.<imgcaption ceo_bbiq|Centering ƒ(CEO) on reference frequency (Baseband IQ optimization)>{{ :ffc:locking_electronics:updated_centering_fceo.png?800 |}}</imgcaption>\\ 
-  - Press the “Lock” button (<imgref ceo_lock>, top middle). If the system doesn’t lock, change the VCO sign to the opposite polarity (top right) and try again. A warning may occur if the selected VCO sign is incorrect. If the system still won't lock, try lowering the K<sub>p</sub> value (bottom left).<imgcaption ceo_lock|Locking ƒ(CEO)>{{ :ffc:locking_electronics:fceo_3_locked.png?800 |}}</imgcaption>+  - Press the “Lock” button (<imgref ceo_lock>, top middle). If the system doesn’t lock, change the VCO sign to the opposite polarity (top right) and try again. A warning may occur if the selected VCO sign is incorrect. If the system still won't lock, try lowering the K<sub>p</sub> value (bottom left).<imgcaption ceo_lock|Locking ƒ(CEO)>{{ :ffc:locking_electronics:updated_locking_fceo.png?800 |}}</imgcaption>
   - If the Beatnote is properly locked, the integrated phase noise value listed in the center of the window should be close to the value listed in your devices CoC.   - If the Beatnote is properly locked, the integrated phase noise value listed in the center of the window should be close to the value listed in your devices CoC.
  
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   - Navigate to the “Optical Lock” window and enable the “Auto-refresh” button in the top left of the window. Set your desired RF lock frequency of the ƒ<sub>opt</sub> beatnote in the “Reference Frequency [Hz]” input. Adjust the “Offset DAC 1” slider near the top left by clicking and dragging the slider until the Beatnote is roughly centered in the red filter trace (<imgref opt_bbiq>).   - Navigate to the “Optical Lock” window and enable the “Auto-refresh” button in the top left of the window. Set your desired RF lock frequency of the ƒ<sub>opt</sub> beatnote in the “Reference Frequency [Hz]” input. Adjust the “Offset DAC 1” slider near the top left by clicking and dragging the slider until the Beatnote is roughly centered in the red filter trace (<imgref opt_bbiq>).
   - Note: If parts of the GUI window are cutoff, shift the window out of full screen and press the maximize window button. \\ <imgcaption opt_bbiq|Centerig ƒ(opt) on reference frequency (Baseband IQ optimization)>   - Note: If parts of the GUI window are cutoff, shift the window out of full screen and press the maximize window button. \\ <imgcaption opt_bbiq|Centerig ƒ(opt) on reference frequency (Baseband IQ optimization)>
-{{ :ffc:locking_electronics:fopt_1_no-lock.png?800 |}}</imgcaption>\\ +{{ :ffc:locking_electronics:updated_centering_fopt.png?800 |}}</imgcaption>\\ 
-  - Press the “Lock” button (<imgref fopt_lock>, top middle). If the system doesn’t lock, change the VCO sign to the opposite polarity (top right) and try again. A warning may occur if the selected VCO sign is incorrect. If the system still won't lock, try lowering the K<sub>p</sub> value (bottom center).<imgcaption fopt_lock|Locking ƒ(opt)>{{ :ffc:locking_electronics:fopt_2_locked.png?800 |}}</imgcaption>\\ +  - Press the “Lock” button (<imgref fopt_lock>, top middle). If the system doesn’t lock, change the VCO sign to the opposite polarity (top right) and try again. A warning may occur if the selected VCO sign is incorrect. If the system still won't lock, try lowering the K<sub>p</sub> value (bottom center).<imgcaption fopt_lock|Locking ƒ(opt)>{{ :ffc:locking_electronics:updated_locking_fopt.png?800 |}}</imgcaption>\\ 
   - If the Beatnote is properly locked, the integrated phase noise value listed in the center of the window should be close to the value listed in your devices CoC.   - If the Beatnote is properly locked, the integrated phase noise value listed in the center of the window should be close to the value listed in your devices CoC.
-  - Adjust PID settings (bottom of <imgref fceo_lock> and <imgref fopt_lock>) as needed to lower the integrated phase noise of each parameter (f<sub>CEO</sub> and f<sub>opt</sub>). The default settings provided in the software are tuned for your specific device but tweaking the values can often improve performance based on the noise characteristics of your environment. +  - Adjust PID settings (bottom of <imgref ceo_lock> and <imgref fopt_lock>) as needed to lower the integrated phase noise of each parameter (f<sub>CEO</sub> and f<sub>opt</sub>). The default settings provided in the software are tuned for your specific device but tweaking the values can often improve performance based on the noise characteristics of your environment. 
  
 =====Troubleshooting===== =====Troubleshooting=====
 ====Overview==== ====Overview====
-In many cases, all that is necessary to get up-and-running with the SLICE-FPGA-II is to install the correct WinPython distribution, and run the provided GUI software using the WinPython Spyder environment.+In many cases, all that is necessary to get up-and-running with the SLICE-FPGA-II is to install the correct WinPython distribution, and run the provided GUI software using the WinPython terminal.
 If you are unable to connect the GUI to the SLICE-FPGA-II, follow the below instructions to eliminate possible causes of failure. If you are unable to connect the GUI to the SLICE-FPGA-II, follow the below instructions to eliminate possible causes of failure.
  
ffc/locking_electronics/slice-fpga-ii.txt · Last modified: 2023/08/09 00:20 by 127.0.0.1