Optical Transmission Interface Configuration Adjustment
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Solution Overview
Problem
Configuring optical transmission interfaces in optical networks with optical band-pass filters is challenging due to unknown or temperature-dependent effective passbands, leading to potential signal attenuation, especially with flat-top filters, and existing solutions require temperature-controlled environments or powered splitters for stability.
Innovation Solution
A method and device for monitoring the signal temporal shape of optical signals to determine if the optical transmission interface configuration needs adjustment, using techniques such as obtaining signal strength measurements, oversampling, and comparing with predefined shapes to ensure the carrier wavelength is within the filter's passband, allowing for cost-effective and flexible configuration without temperature control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If temperature-controlled environments or powered splitters are used to ensure passband stability, then the stability of the optical band-pass filter passband is improved, but the device complexity and cost increase
Solution Approach 1:
The system uses the optical signal itself to detect passband misalignment by analyzing signal strength variations at different wavelengths. The terminal autonomously measures the received signal strength indicator (RSSI) at multiple wavelengths and automatically determines whether the carrier wavelength is within the passband, eliminating the need for external temperature control systems or powered splitters.
Solution Approach 2:
The invention changes the detection parameter from direct passband characteristics (which are temperature-dependent) to signal strength measurements at multiple wavelengths. By sweeping through a range of wavelengths and measuring signal strength, the system can identify the passband location without being affected by temperature variations, thus avoiding the need for temperature-controlled environments.
2Adaptability or versatility
If the carrier wavelength is configured without knowing the effective passband, then the configuration flexibility is improved, but the signal attenuation increases due to potential misalignment
Solution Approach 1:
Before normal communication begins, the system performs a preliminary detection phase where it sweeps through a range of wavelengths and measures signal strength at each wavelength. This preliminary action identifies the effective passband location and width, allowing the terminal to then configure its carrier wavelength accurately within the passband, thereby avoiding signal attenuation while maintaining configuration flexibility.
Solution Approach 2:
The system implements a feedback mechanism where the terminal continuously monitors the received signal strength indicator (RSSI) and compares it against threshold values. Based on this feedback, the terminal can automatically adjust its carrier wavelength to remain within the passband, even when the passband shifts due to temperature variations or other factors, thus preventing signal attenuation.
3Device complexity
If signal strength measurement alone is used to detect passband alignment, then the measurement simplicity is improved, but the detection precision deteriorates for flat-top filters
Solution Approach 1:
The invention segments the passband detection process into multiple discrete wavelength measurements. Instead of relying on a single signal strength measurement, the system measures signal strength at multiple wavelengths across the expected passband range. By analyzing the pattern of signal strength variations across these segmented wavelength points, the system can precisely identify the passband location and detect misalignment even with flat-top filters where single-point measurement would be ineffective.
Data Source
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AI summary
The invention relates to a method for determining whether a configuration of an optical transmission interface of a first device has to be adjusted for transmitting an optical signal to a second device via an optical band-pass filter, the second device having an optical reception interface configured to enable receiving optical signals output by said optical band-pass filter and transmitted by the first device on a carrier wavelength when said carrier wavelength is comprised in the passband of the optical band-pass filter. A monitoring device performs: obtaining an information representative of a signal temporal shape corresponding to a symbol of an optical signal received by the second device, from the first device, via the optical band-pass filter; determining whether the configuration of the optical transmission interface of the first device has to be adjusted, on the basis of said information representative of the signal temporal shape.