Coherent Optical Module Calibration With Segmented Power Curves
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Solution Overview
Problem
Conventional coherent optical modules face challenges in optical power calibration due to the lack of space for external tap photo detectors, and integrated photo diodes are not always used, leading to inadequate reporting precision in the optical power range.
Innovation Solution
A calibration method that determines first and second curve relationships between power-gain monitoring voltage and optical power, and target setting voltage, respectively, to divide the optical power range into two segments, using these relationships to calibrate the module appropriately based on the optical power level, without relying on photo diodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an external tap photo detector is used for optical power calibration, then calibration accuracy is improved, but device size increases
Solution Approach 1:
The patent extracts the photo detector function from the receiver module by using an external optical power meter for calibration, while the receiver module only performs the measurement function. This separation allows the receiver to be miniaturized without compromising calibration accuracy.
Solution Approach 2:
The patent introduces an external optical power meter as an intermediary device to perform optical power measurement during calibration. This intermediary enables accurate calibration without requiring the receiver to contain its own photo detector, thus resolving the size constraint.
2Volume of moving object
If an integrated photo diode is used in the receiver for calibration, then device size is reduced, but calibration accuracy deteriorates when PD is not integrated
Solution Approach 1:
The patent makes the calibration method universal by supporting both integrated PD and external optical power meter configurations. The system can adapt to different receiver designs (with or without integrated PD) and maintain calibration accuracy across all configurations through a unified calibration approach.
3Device complexity
If a single calibration curve is used for the entire optical power range, then device complexity is reduced, but reporting precision deteriorates
Solution Approach 1:
The patent segments the optical power range into multiple intervals and creates separate calibration curves for each interval. This segmentation allows the system to achieve high reporting precision across the entire optical power range by using the most appropriate calibration curve for each specific power level, while maintaining manageable complexity through automated curve selection.
Data Source
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AI summary
Disclosed are a calibration method, apparatus and device for a coherent light module, and a computer-readable storage medium. The method comprises: obtaining a first curve relationship and a second curve relationship, wherein the first curve relationship represents a relationship between a power-gain monitoring voltage and optical power of a receiver of the coherent optical module in an optical power range of the receiver of the coherent light module, and the second curve relationship represents a relationship between a target setting voltage and the optical power of the receiver in the optical power range of the receiver of the coherent light module; determining first optical power based on the first curve relationship and the second curve relationship, wherein the first optical power is used for dividing the optical power range of the receiver into two ranges; and determining a calibration mode of the coherent light module based on the first optical power, wherein the calibration mode comprises: in the case that the optical power of the receiver of the coherent light module is in a first range, calibrating the coherent light module by using the first curve relationship, and in the case that the optical power of the receiver of the coherent light module is in a second range, calibrating the coherent light module by using the second curve relationship.