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ffc:locking_electronics:slice-fpga-ii [2023/06/09 21:08] – external edit 127.0.0.1 | ffc: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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- 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. |
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=====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. |
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