Optical Module Noise Characterization via Theoretical Curve Deviation
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Solution Overview
Problem
Existing methods for measuring optical transmission and reception characteristics in optical transmission and reception modules are cumbersome and high-risk, requiring large-scale apparatuses and struggling to separate individual deterioration factors. Additionally, these methods fail to accurately measure transmission characteristics in Dense Wavelength Division Multiplexing (DWDM) networks due to noise and nonlinear optical effects.
Innovation Solution
A measurement apparatus and method that create a table associating electrical noise values with bit error rates in optical transmission and reception modules. This apparatus estimates actual device noise curves, calculates theoretical noise curves using theoretical equations, and determines noise amounts from deviations between actual and theoretical curves. It then calculates optical transmission and reception characteristics using these noise amounts, enabling easy measurement without large-scale apparatuses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the noise loading method using optical amplifier or optical spectrum analyzer is used to measure actual device characteristics, then measurement accuracy is improved, but device complexity and measurement risk increase significantly
Solution Approach 1:
The patent uses a theoretical noise curve as a reference model to compare against actual measurements. Instead of requiring complex apparatus to directly measure all characteristics, the system creates a theoretical copy of expected behavior and uses deviation analysis to infer actual device characteristics, thereby reducing measurement complexity while maintaining accuracy
Solution Approach 2:
The patent introduces a theoretical noise curve as an intermediary element between the measurement system and the actual device characteristics. This theoretical curve serves as a reference that mediates the comparison process, allowing indirect measurement of device characteristics through deviation analysis rather than direct complex measurement
2Measurement precision
If the noise loading method is used to obtain overall actual device characteristics, then comprehensive measurement is achieved, but the ability to separate and analyze individual deterioration factors is lost
Solution Approach 1:
The patent segments the overall device characteristics into individual deterioration factors by comparing theoretical curves with actual measurements across different transmission modes. The system separates high multi-value deterioration, noise characteristics, and manufacturing errors into distinct analyzable components through curve deviation analysis at different operating points
Solution Approach 2:
The patent changes measurement parameters by evaluating device characteristics across multiple transmission modes with different baud rates and multi-values. By varying these parameters and observing how the noise curve deviations change, the system can identify and separate different deterioration factors that affect the device differently under various operating conditions
3Productivity
If transmission characteristics are measured in DWDM networks with optical amplifiers, then network performance optimization is enabled, but measurement accuracy deteriorates due to spontaneous emission noise and nonlinear optical effects
Solution Approach 1:
The patent extracts the device-specific noise characteristics from the overall transmission characteristics by comparing actual measurements with theoretical curves. This extraction process separates the intrinsic device noise from the transmission path noise caused by optical amplifiers and nonlinear effects, enabling accurate device characterization even in DWDM network environments
Solution Approach 2:
The patent uses a loopback measurement configuration that applies excessive or partial action by measuring device characteristics in isolation before deployment. This preliminary measurement approach captures device-specific characteristics without the confounding effects of the full transmission path, allowing subsequent network performance optimization based on accurate baseline device data
Data Source
AI summary
A measurement apparatus includes a creation unit that creates a table in which a value of repeatedly applied electrical noise is associated with a bit error rate occurring at the time of application of the electrical noise in an optical transmission and reception module for transmitting a bit string to itself in a predetermined transmission mode, and an estimation unit that estimates and calculates an actual device noise curve of the optical transmission and reception module, calculates a theoretical noise curve of the optical transmission and reception module using a theoretical equation for the transmission mode, estimates and calculates a noise amount of the optical transmission and reception module from a deviation between the actual device noise curve and the theoretical noise curve, and estimates and calculates optical transmission and reception characteristics of the optical transmission and reception module as actual device characteristics using the noise amount.