Optical Line Terminal Burst Signal Power Detection Circuit
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Solution Overview
Problem
The existing Optical Line Termination (OLT) modules in GPON systems face challenges in accurately and rapidly detecting the average optical power of burst signal packets, especially due to high sensitivity requirements and interference issues in high-speed data transmission.
Innovation Solution
The proposed optical line termination device includes an optical reception component, a current mirror, a current-voltage conversion circuit, a switch circuit, and a tank circuit connected sequentially, with a processor to supervise the average optical power, utilizing a stacked-layer PCB design to improve sensitivity and precision, and a trigger control signal to sample and hold voltage signals effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional OLT modules are used for burst signal reception, then basic optical signal reception is achieved, but detection precision of average optical power is insufficient
Solution Approach 1:
The patent segments the optical signal detection process into distinct functional modules: optical reception component for signal capture, current mirror for current replication, current-voltage conversion circuit for signal transformation, switch circuit for signal routing, and tank circuit for signal holding. This segmentation allows each module to be optimized independently, improving overall detection precision and reliability of average optical power measurement in burst signals
Solution Approach 2:
The patent introduces intermediary components between the optical reception and processing stages. The current mirror acts as an intermediary to replicate and condition the photocurrent, while the tank circuit serves as an intermediary to hold and stabilize the voltage signal before further processing. These intermediaries enhance signal integrity and improve detection precision without compromising reliability
2Productivity
If high-speed data transmission is implemented in GPON systems, then bandwidth is improved, but interference and sensitivity issues arise
Solution Approach 1:
The patent replaces conventional direct electrical signal processing with an optical-based detection system. The optical reception component converts optical signals to electrical signals through photodetection, and subsequent processing uses optical-insensitive circuits. This substitution reduces electromagnetic interference and sensitivity issues while maintaining high bandwidth transmission capabilities in GPON systems
Solution Approach 2:
The patent creates an electrically inert environment for signal processing by using optical isolation techniques. The optical reception component and subsequent electronic circuits are designed to minimize electromagnetic coupling and interference. This inert environment protects against harmful electromagnetic interference while allowing high-speed data transmission at 2.5 Gbps downstream and 1.25 Gbps upstream
3Measurement precision
If multiple circuit components are added to improve detection precision, then measurement accuracy is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple detection functions into a unified circuit architecture. The current mirror, current-voltage conversion circuit, switch circuit, and tank circuit are integrated into a cohesive detection system that processes optical signals through a single signal path. This merging reduces the number of independent components needed while maintaining high detection precision, thereby controlling device complexity
Solution Approach 2:
The patent designs universal circuit components that perform multiple functions. The current mirror simultaneously replicates current and provides impedance transformation, the current-voltage conversion circuit transforms signals while providing gain, and the tank circuit provides both signal holding and filtering. This multi-functionality reduces the total component count and simplifies the overall device structure while achieving precise average optical power detection
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 configuration enhances the precision and reliability of detecting average optical power in uplink burst mode, facilitating real-time failure detection and simplifying maintenance efforts in optical fiber networks.
Implementation Method 1
an optical reception component and a processor, wherein a current mirror, a current-voltage conversion circuit and a switch circuit are connected sequentially between the optical reception component and the processor
Data Source
AI summary
An optical line terminal (OLT) includes an optical receiving assembly and a processor (4). A current mirror (1), a current-voltage conversion circuit (2) and a switching circuit (3) are connected in sequence between the optical receiving assembly and the processor (4). An energy storage circuit connected to ground is connected between the switching circuit (3) and the processor (4). The optical receiving assembly generates a response current according to the optical signal received. The current mirror (1) processes the current and then transmits it to the current-voltage conversion circuit (2). The conversion circuit (2) converts the current into a voltage signal and transmits the voltage signal to the switching circuit (3). The switching circuit (3) transmits the voltage signal outputted by the conversion circuit (2) to the energy storage circuit. The voltage signal is sampled and held by the energy storage circuit and then outputted to the processor (4). The processor (4) monitors the average optical power of the voltage signal. The OLT can provide a more accurate detection of the average optical power of each burst signal pack in an upstream burst mode.