Optical Receiver Frequency Response Imbalance Measurement
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Solution Overview
Problem
Existing methods for measuring frequency response characteristic imbalance in optical receivers are complex and require multiple changes in central wavelengths of lasers, making the process cumbersome and time-consuming.
Innovation Solution
A method and apparatus that set a nonzero frequency difference between the optical transmitter and receiver, transmit a single-frequency signal, extract and calculate amplitude and phase imbalances in the I and Q branches of the optical receiver, allowing for a single-time measurement without repeated wavelength changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the beat frequency measurement method is used with multiple wavelength changes, then measurement completeness is improved, but measurement process complexity increases and measurement time increases
Solution Approach 1:
The patent applies preliminary action by pre-setting a nonzero frequency difference between the transmitter and receiver lasers before measurement. This preliminary configuration eliminates the need for multiple wavelength changes during the measurement process, allowing the frequency response characteristic imbalance to be measured directly in a single measurement operation, thus simplifying the measurement process while maintaining measurement completeness
Solution Approach 2:
The patent changes the measurement parameter from wavelength (in the beat frequency method) to frequency difference. By setting a fixed nonzero frequency difference between lasers and using single-frequency signals, the measurement can be completed in one operation without repeatedly changing parameters, thereby reducing measurement process complexity while achieving accurate measurement of amplitude ratio and phase imbalance
2Measurement precision
If multiple wavelength changes are performed for measurement, then measurement coverage is improved, but measurement time increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring a nonzero frequency difference between lasers before the measurement process. This preliminary setup enables the measurement to be completed in a single operation without requiring multiple wavelength changes, significantly reducing the measurement time while ensuring comprehensive measurement coverage of the frequency response characteristics
Solution Approach 2:
The patent implements continuous useful action by performing the measurement in a single continuous operation with a fixed frequency difference setting. The single-frequency signal is transmitted and the frequency response characteristic imbalance is measured continuously without interruption or repeated wavelength adjustments, thereby minimizing measurement time while maintaining measurement accuracy
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach simplifies the measurement process while ensuring accuracy by directly calculating amplitude and phase imbalances through split frequency signals, reducing the need for multiple wavelength adjustments.
Implementation Method 1
setting a frequency difference between lasers of the optical transmitter and the optical receiver to be a nonzero value
Data Source
AI summary
A measuring method and apparatus of frequency response characteristic imbalance of an optical receiver, in which by transmitting at least one single-frequency signal in an I branch or a Q branch of an optical transmitter, an amplitude ratio and phase imbalance of the I branch and the Q branch of the optical receiver are directly calculated according to at least one pair of received signals extracted from the I branch and the Q branch of the optical receiver of which frequencies are split due to a frequency difference between lasers of the optical transmitter and the optical receiver, with no need of many times of changes of central wavelengths of lasers of the optical transmitter and the optical receiver for performing measurement for many times, and measurement of frequency response characteristic imbalance of the optical receiver may be achieved through one time of measurement, which is simple in process and accurate in measurement result.