Optical Signal Phase Alignment via Dither Feedback Loop
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Solution Overview
Problem
Manual alignment of electrical data signals in optical communication systems is time-consuming, imprecise, and unable to adapt to changes, leading to potential phase alignment errors and reduced transmission efficiency.
Innovation Solution
A method using integrated complementary taps and a dither signal to automatically align data signals within a transmitter through a feedback loop, calculating a correction factor to adjust the phase of the signals and maintain alignment during operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual alignment of electrical data signals is performed, then phase alignment can be achieved, but the process is time-consuming and imprecise
Solution Approach 1:
The system performs self-alignment through an automated feedback mechanism. The alignment controller automatically adjusts the phase of data signals by calculating correction factors from error values derived from monitor signals, eliminating the need for manual intervention and achieving both high precision and time efficiency
Solution Approach 2:
An automated feedback loop is implemented where monitor signals are continuously sampled, error values are calculated by comparing expected and actual phase positions, and correction factors are applied to adjust the phase of data signals. This closed-loop system ensures precise and rapid alignment
2Adaptability or versatility
If static calibration values are used for signal alignment, then initial alignment can be achieved, but the system cannot adapt to changes during operation
Solution Approach 1:
The system transitions from static calibration to dynamic alignment by continuously monitoring signal phases and automatically adjusting correction factors in real-time. This allows the system to adapt to changing operating conditions such as different bit rates while maintaining reliable alignment through ongoing feedback control
Solution Approach 2:
The system dynamically changes the phase parameters of data signals based on calculated correction factors. By continuously adjusting these parameters in response to monitored error values, the system maintains optimal alignment across varying operating conditions without requiring manual recalibration
Data Source
AI summary
The present invention provides a method and apparatus for phase aligning two optical signals within an optical transmitter to each other (and, in some embodiments, to a pulse carved optical signal) using integrated complimentary taps and a dither signal. The phase of a first signal may be intentionally offset relative to the phase of a second signal. Based on the offset, a correction factor may be calculated. The correction factor may be used to shift the phase of the first signal and/or the second signal in order to generally align the signals. This procedure may be automatically performed in a feedback loop to cause the signals to come into alignment and maintain the alignment of the signals during operation of the transmitter.