Burst-Mode Optical Amplifier Gain Detection Using FPGA Sampling
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Solution Overview
Problem
Conventional optical amplifiers struggle to accurately detect optical power and gain in burst mode, particularly in passive optical networks, due to limitations in existing detection apparatuses and algorithms that require modifications to the ONU module and increase system complexity.
Innovation Solution
An apparatus and method utilizing multiple optical power detection circuits with FPGA devices, temperature detection circuits, and analog-digital conversion chips to accurately calculate optical power and gain in burst mode without modifying the ONU module, using a digital circuit design that processes sampled analog signals and compensates for temperature variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-chip microcomputer is used for optical power detection, then the detection system is simple, but the operation speed is slow and cannot accurately detect optical power in burst mode
Solution Approach 1:
The patent replaces the single-chip microcomputer (software-based processing) with an FPGA device (hardware-based parallel processing). This substitution enables simultaneous sampling of input and output optical power through parallel circuit operations, achieving high-speed burst mode detection while maintaining system simplicity.
Solution Approach 2:
The patent divides the detection system into multiple independent optical power detection circuits, each with its own ADC conversion chip. This segmentation allows parallel processing of multiple optical signals simultaneously, improving operation speed while keeping each individual circuit module simple.
2Ease of manufacture
If a single-chip microcomputer is used for optical power detection, then the system is easy to implement, but input and output optical power cannot be simultaneously sampled
Solution Approach 1:
The patent replaces the sequential processing of a single-chip microcomputer with parallel hardware circuits in the FPGA. Multiple optical power detection circuits and ADC chips operate simultaneously, enabling concurrent sampling of input and output optical power, which is essential for accurate gain calculation in burst mode.
Solution Approach 2:
The patent segments the detection system into independent parallel circuits, each capable of simultaneous sampling. This segmentation allows the system to implement complex simultaneous measurement functions while keeping each individual circuit module simple and easy to manufacture.
3Adaptability or versatility
If conventional detection methods are used in burst mode, then the existing ONU module can be used, but accurate optical power and gain detection cannot be achieved
Solution Approach 1:
The patent designs the optical power detection circuits and FPGA device to work with the existing ONU module without requiring modifications. The universal design allows the detection system to handle both continuous and burst mode signals, maintaining compatibility while achieving accurate detection through parallel simultaneous sampling.
4Speed
If the operation speed of the detection device is increased to handle burst mode, then accurate detection becomes possible, but the device complexity increases
Solution Approach 1:
The patent segments the high-speed detection function into multiple independent optical power detection circuits with separate ADC chips. Each circuit handles a specific optical signal independently, allowing parallel processing that achieves high operation speed while keeping each individual circuit module simple and manageable.
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
Enables timely and accurate detection of optical power and gain in burst mode, reducing system complexity and maintaining compatibility with current broadband communication systems by using FPGA devices for real-time data processing and temperature compensation.
Implementation Method 1
The photoelectric converter converts an optical signal into a current signal
Data Source
AI summary
An optical power and gain detection apparatus including multiple optical power detection circuits, an FPGA device, and a temperature detection circuit. Various optical power detection circuits include a respective independent photoelectric converter, a trans-impedance amplifier, an analog signal conditioning circuit, a filter and an analog-digital conversion chip. By improving an analog circuit, digital detection and control in an optical amplifier, the property of the FPGA device may be used to realize the detection of optical signal and gain in a burst mode, avoid increasing complicated analogue circuits, and avoid the influence caused by element inconsistency in an analogue control solution. Whether the optical signal is in a stable mode or in a burst mode, the algorithm can detect the optical power accurately and stably, with a wide application range. By strictly controlling the synchronism of ADC sampling and the delay of calculation, the amplifier gain may be calculated more accurately.