Optical Transceiver Crosstalk Suppression via Signal Subtraction
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Solution Overview
Problem
Optical transceiver modules face reduced sensitivity due to crosstalk, where a part of the optical signal transmitted by a laser diode is reflected or refracted back to the photodiode, interfering with the identification of external optical signals.
Innovation Solution
A method and apparatus that adjust the electrical signal from the laser diode based on pre-obtained transmission parameters of the photodiode, such as delay and amplitude coefficients, to subtract the crosstalk signal from the photodiode's output, thereby isolating the original external signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If optical signal is transmitted through the optical transceiver module, then data transmission is achieved, but crosstalk occurs and sensitivity is reduced
Solution Approach 1:
The patent converts the harmful crosstalk signal into a beneficial component by using it to generate a cancellation signal. The crosstalk signal, which was previously interfering with the photodiode's ability to detect external optical signals, is now utilized to create an equal and opposite signal that cancels out the crosstalk effect, thereby improving sensitivity while maintaining data transmission functionality.
Solution Approach 2:
The patent introduces an intermediary cancellation signal that mediates between the transmitted optical signal and the crosstalk interference. This intermediary signal, generated by adjusting the laser diode output based on the crosstalk characteristics, acts as a counteracting force that eliminates the harmful interference without blocking the useful signal transmission.
2Adaptability or versatility
If laser diode transmits optical signal, then data communication is enabled, but reflected/refracted signal interferes with external signal detection
Solution Approach 1:
The patent implements a feedback mechanism where the system continuously monitors the crosstalk effects and adjusts the laser diode driving signal accordingly. The cancellation signal generation unit receives feedback about the crosstalk characteristics and dynamically adjusts the laser diode output to maintain optimal performance, thereby adapting to varying communication conditions while suppressing interference.
Solution Approach 2:
The patent changes the parameters of the laser diode driving signal to compensate for crosstalk effects. By adjusting parameters such as amplitude, phase, and timing of the driving signal, the system generates cancellation signals that effectively counteract the reflected and refracted interference, enabling versatile data communication while minimizing harmful factors.
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 effectively suppresses crosstalk, enhancing the sensitivity of the optical transceiver module by removing the interfering signal and improving signal precision.
Implementation Method 1
a photodiode (PD) in the optical transceiver module is configured to receive an optical signal sent from an external signal source, perform optical-to-electrical transformation on the optical signal sent from the external signal source
Data Source
AI summary
Embodiments of the present invention provide a crosstalk suppression method and apparatus. By obtaining a first electrical signal indicating a data bit stream of a first optical signal output by a laser diode (LD) in an optical transceiver module and a transmission parameter of a photodiode (PD), adjusting the first electrical signal based on the transmission parameter of the PD to obtain a third electrical signal indicating an electrical signal transformed by the PD from the first optical signal transmitted by the LD, and subtracting the third electrical signal from a second electrical signal output by the PD in the optical transceiver module, an electrical signal generated by the optical signal transmitted by the LD and reflected or refracted to the PD is removed from the electrical signal output by the PD, thereby suppressing crosstalk and improving the sensitivity of the optical transceiver module.