Optical Modulator Delay Control Circuit for Timing Error Correction
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Solution Overview
Problem
Existing optical DAC modulators lack a means to monitor and adjust signal input timing errors among electrode segments during operation, leading to waveform deterioration due to temperature changes or other environmental factors.
Innovation Solution
A delay control circuit that includes a delay circuit, a monitor to detect the power of baud rate frequency components, and a control circuit to adjust the delay amount based on the monitored power, ensuring optimal signal timing alignment among electrode segments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If manual adjustment of delay amount is performed during setup, then initial timing alignment can be achieved, but the system cannot adapt to temperature changes or environmental variations during operation
Solution Approach 1:
The patent implements a feedback mechanism where the monitor detects the power of baud rate frequency components from the optical modulator output, and the control circuit adjusts the delay amount based on this detection to maximize the monitored power. This closed-loop feedback system enables automatic adaptation to temperature changes and environmental variations without manual intervention, resolving the contradiction between adaptability and system complexity.
Solution Approach 2:
The system performs self-adjustment of delay timing during operation through automatic monitoring and control. The monitor and control circuit work autonomously to detect timing errors and adjust delay amounts in response to environmental changes, eliminating the need for external manual adjustment and enabling the system to service itself, thus improving adaptability without proportionally increasing complexity.
2Reliability
If delay control circuit with monitor and control circuit is added, then timing error can be reduced during operation, but device complexity increases
Solution Approach 1:
The delay control circuit uses feedback from the monitor detecting baud rate frequency component power to automatically adjust delay timing, improving signal timing accuracy and reliability during operation. The feedback mechanism enables the system to self-correct timing errors caused by temperature changes or environmental factors, enhancing reliability while keeping the complexity increase manageable through automated control.
Solution Approach 2:
The monitor circuit serves multiple functions: it detects the power of baud rate frequency components, identifies timing errors in the delay control circuit, and provides feedback for adjustment. This multi-functionality improves timing accuracy while minimizing the additional complexity by making the monitor circuit perform several critical tasks within a single component.
3Ease of operation
If manual delay adjustment is performed, then initial setup can be completed, but no monitoring means exists during operation leading to waveform deterioration
Solution Approach 1:
The patent introduces a feedback-based monitoring system where the monitor detects baud rate frequency component power during operation, and the control circuit adjusts delay amounts to maximize this power. This feedback mechanism ensures continuous monitoring and automatic correction of timing errors, maintaining signal quality and waveform integrity during operation without compromising the simplicity of initial setup.
Solution Approach 2:
The delay control circuit enables the system to self-monitor and self-adjust during operation. The monitor and control circuit work autonomously to detect timing errors and correct them in real-time, eliminating the need for continuous manual monitoring and adjustment while maintaining high signal quality and reliability throughout the operational lifecycle.
Data Source
AI summary
A delay control circuit includes a delay circuit configured to delay, by a predetermined delay, a signal input to a plurality of electrode segments provided in series along one or both of two waveguides of a Mach-Zehnder interferometer of an optical modulator, a monitor configured to monitor a power of a baud rate frequency component including a frequency having a value that is equal to a baud rate or an integer multiple of the baud rate, or a power of a beat frequency component of the baud rate frequency component, from output light of the optical modulator, and a control circuit configured to control a delay amount of the delay circuit so as to maximize a monitored power of the baud rate frequency component or the beat frequency component.