Optical Transceiver Crosstalk Reduction via Phase-Shifted Amplifier Selection
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Solution Overview
Problem
Current optical transceivers face challenges in reducing crosstalk between the optical transmitter and receiver, especially in high-speed operations, due to the large current signal from the transmitter degrading the quality of the receiving signal.
Innovation Solution
The optical transceiver incorporates a phase comparator and selector with delay circuits to compare the phases of the transmitting and receiving signals, allowing the selector to choose the optimal amplifier output, thereby minimizing crosstalk by adjusting the timing of the receiving signal to avoid noise overlap.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the optical transmitter flows large current to drive the semiconductor optical device, then the optical signal transmission capability is improved, but crosstalk occurs that degrades the receiving signal quality
Solution Approach 1:
The receiving signal path is segmented into multiple parallel channels, each with independent delay circuits. This segmentation allows the system to process signals at different timing phases, separating the desired signal from crosstalk noise that occurs at specific timing moments.
Solution Approach 2:
The system dynamically adjusts the delay time of each channel's delay circuit based on the detected crosstalk timing. By making the delay time variable rather than fixed, the system can adapt to different crosstalk conditions and continuously optimize signal quality.
2Object-affected harmful factors
If the reference level of the comparator is adjusted to reduce crosstalk, then the receiving signal quality is improved, but the adjustment cannot be carried out instantly synchronized with the occurrence of crosstalk in high-speed operation
Solution Approach 1:
The system performs preliminary detection of crosstalk timing using a portion of the receiving signal, and based on this advance detection, pre-adjusts the delay times of the delay circuits before the crosstalk actually degrades the signal. This preliminary action enables the system to be ready to counteract crosstalk before it occurs.
Solution Approach 2:
The system continuously monitors the receiving signal for crosstalk characteristics, feeds back the detected crosstalk timing information to the delay circuit control, and adjusts the delay times accordingly. This closed-loop feedback mechanism enables real-time adaptation to crosstalk conditions at high speeds.
3Object-affected harmful factors
If delay circuits with different delay times are introduced in each main amplifier, then the crosstalk noise superposition timing is shifted and signal quality is improved, but the device complexity increases
Solution Approach 1:
Instead of adding completely separate amplification channels, the system changes the timing parameter (delay time) of existing delay circuits in each channel. By adjusting this single parameter differently across channels, the system achieves crosstalk separation without duplicating entire amplifier structures.
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 solution effectively reduces crosstalk noise by synchronizing the receiving signal timing, enhancing the quality of the received signal and improving the transceiver's performance in high-speed optical communication.
Implementation Method 1
an light-emitting device and, by receiving a transmitting signal synchronized with a transmitting clock, converts the transmitting signal into an optical signal corresponding to the transmitting signal
Implementation Method 2
a light-receiving device and a plurality of main amplifiers. The light-receiving device converts a received optical signal into a receiving signal corresponding to the received optical signal
Data Source
AI summary
The present invention provides an optical transceiver that enables to reduce the crosstalk from the optical transmitter to the optical receiver. The regenerator of the optical transceiver includes two main amplifiers, a selector, a selector control, and a re-shaper for shaping the receiving signal selected by the selector. The first main amplifier provides a first amplifier and a delay circuit connected in upstream to the first amplifier. The second main amplifier provides a second amplifier and a delay circuit connected in downstream to the second amplifier. The selector selects, based on the phase difference between the receiving signal Rx and the transmitting signal Tx, the output from the first main amplifier or that from the second main amplifier.