Polarization Beam Splitter Phase Shifter Optical Signal Processing
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Solution Overview
Problem
Optical transmission systems using bit-to-bit polarization-interleaved signals are sensitive to polarization-dependent losses, where adjacent pulses experience different attenuations, complicating signal processing and compensation.
Innovation Solution
A device comprising a polarization beam splitter, a phase shifter, and a delay filter is used to convert alternated-polarized signals into single-polarized signals, allowing for effective compensation of polarization-dependent losses by combining and processing the signals to equalize pulse heights.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a bit-to-bit polarization-interleaved signal is used in optical transmission, then the signal capacity and transmission efficiency are improved, but the signal becomes highly sensitive to polarization-dependent losses causing adjacent pulses to experience different attenuations
Solution Approach 1:
The invention segments the polarization-interleaved signal into separate polarization components using a polarization beam splitter. The signal is divided into two distinct paths corresponding to orthogonal polarization states, allowing independent processing of each polarization component to eliminate the harmful interaction between adjacent pulses with different polarizations
Solution Approach 2:
A polarization beam splitter acts as an intermediary device that separates the mixed polarization signal into pure polarization components. This intermediary enables the system to handle polarization-dependent losses by processing each polarization state separately before recombination, thus mitigating the sensitivity to PDL while maintaining the benefits of polarization-interleaved transmission
2Reliability
If polarization-dependent losses are compensated in the original alternated-polarized signal, then the signal quality is improved, but the processing complexity and efforts required are significantly increased
Solution Approach 1:
By segmenting the signal into separate polarization components, the invention simplifies the compensation process. Instead of dealing with complex polarization interactions in the original signal, each polarization component can be processed independently with simpler equalization techniques, reducing overall processing complexity while improving signal quality
Solution Approach 2:
The invention changes the polarization parameter of the signal by converting it from an alternated-polarized format to a single-polarized format. This parameter transformation enables the use of simpler processing techniques that are less sensitive to polarization-dependent losses, thereby improving signal quality with reduced processing efforts
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
The solution significantly reduces efforts required to compensate polarization-dependent losses, enabling more efficient processing of single-polarized data streams, particularly in digital signals like DPSK format, by converting alternated-polarized signals into single-polarized streams that can be further processed to mitigate these losses.
Implementation Method 1
a polarization beam splitter for receiving the signal
Implementation Method 2
a phase shifter for shifting the phase of the signal at the orthogonal output of the polarization beam splitter
Data Source
AI summary
A device for processing a digital signal of an optical transmission system is described. The device comprises: a polarization beam splitter for receiving the signal, a phase shifter for shifting the phase of the signal at the orthogonal output of the polarization beam splitter, and means for combining the signal at the parallel output of the polarization beam splitter and the shifted signal.