Linien App structure

• Correlation Between Blocks
• Interaction Workflow
• Detailed Interaction Example
• Summary of Correlation
• CPU (Linien Server)
• FPGA (Linien Gateware)
• User's PC (Linien Client and GUI)
• Optical Setup Example

Correlation Between Blocks

The overall system consists of multiple interconnected blocks: the User's PC (Linien client and GUI), CPU (Linien server), FPGA (Linien gateware), and the Optical Setup. Each block plays a specific role, and their coordinated interaction enables the system to perform advanced optical experiments.

Linien – A versatile, user-friendly and open-source tool for laser stabilization based on the Red Pitaya STEMlab platform

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Here's a detailed explanation of how these blocks work together:

Interaction Workflow

1. User's PC (Linien Client and GUI):
• Role: Acts as the interface for the user to interact with the system.
• Functions: Allows users to input commands, configure settings, and visualize data through the GUI.
• Communication: Sends user inputs and commands to the Linien server on the CPU and receives processed data and status updates for visualization.
• Example Interaction: The user sets up an experiment by configuring waveform parameters and starts the data acquisition process through the GUI.
2. CPU (Linien Server):
• Role: Acts as the central coordinator and processor, managing communication and control tasks.
• Functions: Receives commands from the User's PC, translates them into instructions for the FPGA, processes data from the FPGA, and sends processed data back to the User's PC.
• Communication: Intermediates between the User's PC and the FPGA, ensuring efficient data flow and command execution.
• Example Interaction: The Linien server receives configuration parameters from the User's PC, translates them into instructions, and sends these instructions to the FPGA to start generating waveforms.
3. FPGA (Linien Gateware):
• Role: Handles real-time tasks such as signal generation and data acquisition.
• Functions: Executes instructions from the Linien server, generates waveforms using DACs, acquires data using ADCs, and processes data in real-time.
• Communication: Receives instructions from the Linien server, sends acquired and processed data back to the Linien server.
• Example Interaction: The FPGA generates the specified waveforms and sends them to the optical setup, then acquires data from the optical setup, processes it, and sends the processed data back to the CPU.
4. Optical Setup:
• Role: Facilitates the manipulation and measurement of optical signals.
• Functions: Uses components like lasers, modulators, mirrors, lenses, and detectors to conduct optical experiments.
• Communication: Receives waveforms from the FPGA and sends back optical signals for acquisition.
• Example Interaction: The optical setup receives modulated light from the FPGA, interacts with a sample, and the resulting optical signals are detected and sent back to the FPGA for digitization.

Detailed Interaction Example

1. User Input:
• The user configures an optical experiment via the GUI on the User’s PC, specifying parameters such as waveform type, frequency, and duration.
2. Command Transmission:
• The Linien client on the User's PC sends these parameters to the Linien server on the CPU.
3. Instruction Processing:
• The Linien server processes the received parameters and translates them into specific instructions for the FPGA.
• These instructions might involve setting DAC values for waveform generation and ADC settings for data acquisition.
4. Waveform Generation:
• The FPGA receives the instructions and generates the specified waveforms using its DACs.
• These waveforms are sent to the optical setup to drive components like lasers or modulators.
5. Optical Experiment:
• The optical setup manipulates the light based on the generated waveforms.
• The light interacts with the sample, and the resulting optical signals are detected by photodetectors.
6. Data Acquisition:
• The detectors convert the optical signals into electrical signals, which are sent to the FPGA's ADCs for digitization.
• The FPGA processes the digitized data in real-time, performing necessary computations.
7. Data Transmission:
• The processed data is sent back to the Linien server on the CPU.
• The Linien server may further process the data and then send it to the Linien client on the User's PC.
8. Data Visualization:
• The User's PC receives the processed data and updates the GUI.
• The user can then visualize the results, analyze the data, and make further adjustments if needed.

Summary of Correlation

• User's PC ↔ CPU: The User's PC sends configuration and control commands to the CPU and receives processed data and status updates.
• CPU ↔ FPGA: The CPU translates user commands into instructions for the FPGA, sends these instructions, and receives processed data from the FPGA.
• FPGA ↔ Optical Setup: The FPGA generates waveforms for the optical setup and acquires data from it. The optical setup responds to the waveforms and provides the signals to be measured.
• *Optical Setup ↔ FPGA

: The optical setup interacts with the waveforms generated by the FPGA, and sends back signals that are captured and digitized by the FPGA.

Each block relies on the other to perform its function, creating a cohesive system where user inputs can lead to precise control and measurement of optical signals. The flow of data and commands ensures real-time operation and accurate results, enabling sophisticated optical experiments.