Optical Transmission Path Measurement Amplifier Overdrive Detection
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Solution Overview
Problem
Existing devices for measuring optical transmission paths lack effective methods to assess and improve measurement signal quality, particularly in the presence of interference, which can lead to erroneous signals due to amplifier saturation and parasitic influences.
Innovation Solution
The device incorporates detectors to check if measuring amplifiers are within their nominal operating range, uses a window discriminator to assess signal quality, and adjusts the compensation transmitter and transmitter signals to be orthogonal to interference patterns, allowing for interference compensation and system parameterization changes to minimize interference effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the measuring amplifier operates at high gain to improve measurement precision, then measurement precision is improved, but the amplifier may reach saturation and supply erroneous signals
Solution Approach 1:
The patent applies preliminary action by checking the operating point of the measuring amplifier before the actual measurement takes place. A preliminary check signal is applied to the amplifier, and the operating point is verified to ensure it is within the linear range. This prevents saturation during the actual measurement, thereby maintaining both measurement precision and signal accuracy without requiring post-measurement corrections.
2Measurement precision
If detectors are added to check amplifier operating points, then measurement signal quality is improved, but device complexity increases
Solution Approach 1:
The patent merges the detector function with existing components in the measurement device. Rather than adding completely separate detector hardware, the detection of amplifier operating points is integrated into the signal processing path using available circuit elements. This approach improves measurement signal quality while minimizing the increase in device complexity by utilizing shared components and circuits.
3Reliability
If the compensation transmitter and transmitter use orthogonal signals to mitigate interference, then reliability is improved, but device complexity increases due to signal generation requirements
Solution Approach 1:
The patent applies parameter changes by modifying the frequency and phase parameters of the transmitter and compensation transmitter signals. The transmitters are configured to operate at orthogonal frequencies or with specific phase relationships (e.g., 90-degree phase difference). This parameter optimization enables the system to distinguish between the measurement signal and interference signals, improving reliability through better interference rejection while managing complexity through systematic parameter selection.
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 approach enables the device to assess and improve measurement signal quality by identifying and mitigating interference sources, ensuring accurate measurements and reducing the impact of parasitic influences on the measurement signal.
Implementation Method 1
a photodiode is typically operated in the reverse direction
Implementation Method 2
energize the photodiode to compensate for a photocurrent resulting from (e.g. ambient) interference radiation by a voltage-controlled current source
Implementation Method 3
The device has, for example, amplifier elements, integrators or the like
Data Source
Figure 1
Figure 2A~2D
Figure 3
AI summary
The invention relates to a device for measuring an optical transmission path, comprising at least one measurement transmitter (H1, H2, H3) for transmitting an optical measurement signal, at least one receiver (D) for receiving an optical signal, and an actuating and analyzing unit (17) which is connected to the at least one measurement transmitter (H1, H2, H3) and to the at least one receiver (D), actuates the at least one measurement transmitter (H1, H2, H3), and processes and analyses the optical signal received by the at least one receiver (D) as an electric measurement signal. The actuating and analyzing unit (17) has at least one measurement amplifier (18, 19) which has an admissible input signal amplitude nominal range or nominal level that can be adjusted in particular and which is neither overdriven nor underdriven in the event of an input signal with an amplitude within the nominal range or equal to the nominal level. The actuating and analyzing unit (17) further has a detector for detecting an overdrive and/or underdrive and/or for detecting a non-overdrive and/or -underdrive state of the at least one measurement amplifier (18, 19). The quality or performance of the measurement signal is analyzed using the detector and/or the detection signals output by the detector in a monitored manner during a monitoring phase.