Burst-Mode Receiver Switching for Fast Optical Signal Acquisition
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Solution Overview
Problem
Current optical receivers in all-optical multi-access networks face challenges in handling varying optical power levels and phase differences between data packets, leading to inefficiencies in burst-mode operation due to the need for complex circuitry and feedback loops, which increase power dissipation and compromise sensitivity.
Innovation Solution
A burst-mode receiver design featuring a simple implementation with few components, including bias resistors, capacitors, common-mode resistors, bypass switches, and data switches, controlled by a controller to adapt quickly to optical power variations without feedback loops, ensuring high dynamic range and fast response times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If feedback loops are used in receivers to improve reliability and accuracy, then detection precision is improved, but power dissipation increases and settling time increases
Solution Approach 1:
The patent removes the feedback loop from the receiver architecture entirely, extracting the problematic element that caused both high power dissipation and long settling times. The feedforward architecture eliminates the need for continuous feedback signaling, thereby reducing power consumption while maintaining detection accuracy through alternative means such as optimized front-end design and decision-directed equalization.
Solution Approach 2:
The patent applies preliminary action by pre-compensating for channel effects and optimizing the receiver front-end before the signal enters the main detection path. This includes pre-equalization and preliminary signal conditioning that reduces the burden on subsequent stages, allowing accurate detection without requiring power-hungry feedback loops.
2Measurement precision
If feedback loops are used in receivers to improve reliability and accuracy, then detection precision is improved, but settling time increases
Solution Approach 1:
The feedback loop is completely removed from the architecture, eliminating the iterative convergence process that causes long settling times. The feedforward structure provides immediate signal processing without the delay inherent in feedback-based adaptive equalization, enabling faster settling while maintaining detection precision through parallel processing paths.
Solution Approach 2:
The system performs preliminary equalization and signal conditioning before the main detection stage, pre-adjusting the signal characteristics to match optimal detection conditions. This advance preparation reduces the time required for the receiver to settle and lock onto the signal, enabling faster acquisition without sacrificing accuracy.
3Use of energy by moving object
If feedforward type receivers are designed without feedback loops to reduce power dissipation and settling time, then power dissipation is reduced and response time is improved, but baseline wander degrades receiver sensitivity
Solution Approach 1:
The patent introduces intermediary elements such as decision-directed equalizers and intermediate signal processing stages that act as mediators between the feedforward path and the final detection stage. These intermediaries compensate for baseline wander and maintain signal integrity without requiring feedback loops, thereby preserving receiver sensitivity while keeping power consumption low.
Solution Approach 2:
The system dynamically adjusts parameters such as equalization coefficients and signal conditioning settings based on incoming signal characteristics. This adaptive parameter adjustment compensates for baseline wander and maintains optimal sensitivity in the feedforward architecture without the need for feedback-based control.
4Speed
If fast settling systems are designed to improve response time, then acquisition speed is improved, but baseline wander increases that degrades receiver sensitivity
Solution Approach 1:
The system performs fast preliminary equalization and signal conditioning in the initial acquisition phase, quickly establishing the correct signal parameters. This preliminary action enables rapid acquisition while preventing baseline wander from developing, thereby maintaining sensitivity even with fast settling times.
Solution Approach 2:
The receiver dynamically changes parameters such as time constants and equalization settings based on the acquisition phase. During fast acquisition, parameters are optimized for speed, while subsequent stages adjust parameters to maintain sensitivity, achieving both fast acquisition and sustained receiver sensitivity through adaptive parameter control.
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 significantly reduces acquisition time for optical signals, improves receiver sensitivity, and enhances network reliability by optimizing circuit sensitivity and reducing power dissipation, while maintaining robustness and low cost.
Implementation Method 1
a photosensor configured to receive the optical signal and to convert the optical signal to a current signal
Data Source
AI summary
Provided is a burst-mode receiver configured to receive an optical signal having a preamble and a data payload, the burst-mode receiver including a first bias resistor coupled between a first voltage supply and a photosensor, a first capacitor coupled between the photosensor and an amplifier, a first common-mode resistor configured to supply a voltage of a common-mode voltage supply to the amplifier, a first bypass switch configured to couple the first capacitor to the common-mode voltage supply while bypassing the first common-mode resistor, and a first data switch configured to couple the first capacitor to the amplifier, and to couple the first capacitor to the common-mode voltage supply through the first common-mode resistor.