Signal Processing Device for Polarization Multiplexed Optical Receiver
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Solution Overview
Problem
In optical communication systems using polarization multiplexing with hybrid modulation, the accuracy of compensation values for signal distortion is compromised due to the use of different modulation formats in the polarization and time domains, leading to increased bit error rates.
Innovation Solution
A signal processing device that selects a polarization component based on the modulation format of the optical signals and generates a compensation value to compensate for electric field information signals, using a generator and compensation circuit to improve the accuracy of signal processing across both polarization components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If hybrid modulation with multiple modulation formats is used in polarization multiplexing, then transmission capacity and transmittable distance are improved, but the accuracy of compensation values for signal distortion deteriorates
Solution Approach 1:
The patent segments the polarization multiplexed signal into separate first and second polarization components, each processed independently through their own compensation values. This allows each polarization component to be compensated based on its specific modulation format, preventing the degradation of compensation accuracy that would occur if a single compensation value had to serve multiple modulation formats.
Solution Approach 2:
The patent applies different compensation values to different polarization components based on their respective modulation formats. Each polarization component receives localized compensation tailored to its specific characteristics, rather than applying a uniform compensation approach that would compromise accuracy for high-order modulation formats.
2Speed
If the number of bits per symbol is increased, then transmission rate is improved, but the accuracy of compensation value deteriorates
Solution Approach 1:
The patent segments the high-order modulation signal into separate polarization components, allowing each to be compensated independently. This segmentation enables the system to maintain high transmission rates through high-order modulation while preserving compensation accuracy by treating each polarization component separately with dedicated compensation values.
3Device complexity
If a single compensation value is used for both polarization components, then device complexity is reduced, but signal distortion compensation accuracy deteriorates
Solution Approach 1:
The patent segments the compensation processing into separate paths for first and second polarization components, each with its own compensation value generation and application. This segmentation maintains manageable device complexity while significantly improving signal distortion compensation accuracy by allowing independent optimization for each polarization component.
Solution Approach 2:
The patent structure allows the compensation system to handle multiple modulation formats universally across different polarization components. The same basic compensation mechanism is applied to both polarization components, but with separate compensation values that adapt to the specific modulation format of each component, achieving both simplicity and accuracy.
Data Source
AI summary
A signal processing device processes an electric field information signal indicating a polarization multiplexed optical signal in which different modulation formats are used. A first optical signal transmitted in a first polarization component and a second optical signal transmitted in a second polarization component are multiplexed in the polarization multiplexed optical signal. The signal processing device includes a generator and a compensation circuit. The generator selects the first polarization component or the second polarization component based on modulation formats of the first and second optical signals, and generates a compensation value for compensating for an electric field information signal of a selected polarization component based on the electric field information signal of the selected polarization component. The compensation circuit compensates for electric field information signals of the first and second polarization components using the compensation value generated by the generator.