Laser Pulse Generator Clock Synchronization Jitter Reduction
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Solution Overview
Problem
Laser pulse generators experience output jitter due to a lack of synchronization between the start signal and the clock signal, leading to inconsistent output pulses.
Innovation Solution
A laser pulse generator design that synchronizes the clock unit with the start signal using a resettable frequency divider or a start-stop oscillator, ensuring the clock signal is aligned with the start signal to reduce jitter, and incorporates a pulse generator to ensure sufficient pulse duration for data conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the start signal and clock signal are not synchronized, then the laser pulse generator can operate independently with separate triggering, but output jitter occurs leading to inconsistent output pulses
Solution Approach 1:
A delay generator is introduced as an intermediary component between the start signal and the clock signal path. This delay generator receives the start signal and generates a delayed version that is used to trigger the clock unit, ensuring the clock signal is properly synchronized with the data output from the pulse shape memory without requiring complex synchronization circuits
Solution Approach 2:
The system performs preliminary timing setup by using a delay generator to pre-calculate and establish the correct timing relationship between the start signal and clock signal before actual pulse generation occurs. This preliminary timing establishment eliminates jitter during operation without adding complex real-time synchronization mechanisms
2Productivity
If the data conversion time in the DAC is insufficient, then the pulse generation speed increases, but the output pulse quality deteriorates due to incomplete conversion
Solution Approach 1:
The system dynamically adjusts the timing relationship between data output from the pulse shape memory and the clock signal input to the DAC. By using the delay generator to establish optimal timing, the system ensures that data is output and converted at the precise moment when sufficient time is available, allowing flexible adaptation to different pulse shapes and conversion requirements without fixed timing constraints
Solution Approach 2:
The delay generator automatically determines and establishes the appropriate delay time based on the specific pulse shape and conversion requirements, eliminating the need for manual timing adjustment or external intervention. The system self-configures the timing to ensure complete conversion while maintaining optimal pulse generation speed
Data Source
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AI summary
A laser pulse generator (100, 200) comprises: a. a pulse form generation device (2) that includes: i. a pulse form memory (3) for storing data and a digital-to-analog converter (DAC) (4) connected to the pulse form memory; ii. a first terminal (5) for connecting a start signal line (6) of a start signal path (7); iii. a second terminal (8) for connecting a clock signal line (9); iv. a third terminal (11) for connecting a pulse line (12); the first and second terminals (5, 8) are connected to the pulse form memory (3) and the DAC (4) in such a way that when a predefined start signal is present, data is transferred from the pulse form memory (3) to the DAC (4) and is converted by the DAC (4) into an output pulse, in particular at the rate of a clock signal, and said output pulse is supplied at the third terminal (11) for actuating a driver (13) for a laser diode (14); b. a clock unit (10) which is connected to the second terminal (8) via the clock signal line (9). Said laser pulse generator (100, 200) is characterized in that c. the clock unit (10) includes a reset terminal (105) which is connected to the start signal path (7).