Optical Transmitter Analog Monitoring Using Signal Correlation
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Solution Overview
Problem
Existing methods for monitoring and compensating for imperfections in optical transmitters are limited in range and stability, requiring additional communication resources or high hardware and power consumption when performed at the receiving side.
Innovation Solution
An apparatus and method using low-speed photoelectric and electrical devices for correlation processing of optical signals to estimate transmitter analog characteristics, reducing hardware cost and power consumption by performing correlation operations with electro-optical converters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a full-featured wideband receiver is deployed at the transmitting side to monitor transmitter analog characteristic, then monitoring accuracy is improved, but hardware cost and power consumption increase significantly
Solution Approach 1:
The patent extracts only the essential monitoring function from a complete wideband receiver, implementing a simplified monitoring apparatus that performs correlation processing between the optical signal and a local signal to estimate transmitter imperfections, thereby achieving adequate monitoring accuracy without the full hardware overhead of a wideband receiver
Solution Approach 2:
The patent creates a local copy of the transmitted signal through a local oscillator and correlation processing, allowing the transmitter to monitor its own characteristics without requiring a separate full-featured receiver, thus reducing hardware cost and power consumption while maintaining monitoring capability
2Measurement precision
If a full-featured wideband receiver is deployed at the transmitting side to monitor transmitter analog characteristic, then monitoring accuracy is improved, but hardware cost increases
Solution Approach 1:
The patent extracts only the essential monitoring function from a complete wideband receiver, implementing a simplified monitoring apparatus that performs correlation processing between the optical signal and a local signal to estimate transmitter imperfections, thereby achieving adequate monitoring accuracy without the full hardware overhead of a wideband receiver
Solution Approach 2:
The patent creates a local copy of the transmitted signal through a local oscillator and correlation processing, allowing the transmitter to monitor its own characteristics without requiring a separate full-featured receiver, thus reducing hardware cost and power consumption while maintaining monitoring capability
3Reliability
If transmitter imperfection compensation is performed at the receiving side using equalizer, then compensation effect is achieved, but compensation range is limited and stability deteriorates due to channel damage and receiver conditions
Solution Approach 1:
The patent inverts the conventional approach by performing transmitter imperfection compensation at the transmitting side rather than at the receiving side. The monitoring apparatus estimates transmitter characteristics and applies compensation before signal transmission, making the compensation independent of channel conditions and receiver state, thereby significantly improving stability and expanding compensation range
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
The solution allows for accurate monitoring and compensation of transmitter imperfections with lower hardware costs and reduced power consumption, improving transmission performance in optical communication systems.
Implementation Method 1
a first input unit, configured to input a first signal to a first electro-optical converter to obtain an optical signal to-be-measured
Implementation Method 2
a second input unit, configured to input a second signal to a second electro-optical converter to obtain a modulated local signal
Data Source
AI summary
An apparatus and a method for monitoring an analog characteristic of an optical transmitter may include inputting a first signal to a first electro-optical converter to obtain a optical signal to-be-measured; inputting a second signal to a second electro-optical converter to obtain a modulated local signal, so that the second signal is determined according to the first signal and a to-be-monitored analog characteristic of the first electro-optical converter; performing correlation processing on the optical signal to-be-measured and the modulated local signal to obtain at least one correlation quantity; and estimating an analog characteristic of the first electro-optical converter according to the correlation quantity. Accordingly, analog characteristic information of the optical transmitter may be extracted by using the correlation quantity between the optical signal to-be-measured and the modulated local signal, the required hardware cost is much lower than that of a conventional broadband receiver, and because there is no need to perform complex digital signal processing, power consumption is reduced greatly.