Semiconductor Optical Element for Polarization Intensity Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing polarization multiplexing optical receiving technologies face challenges in precisely compensating large optical intensity mismatches between polarized signals caused by Polarization Dependent Loss (PDL) in optical transmission paths, limiting the quality of received signals.
Innovation Solution
A polarization multiplexing optical receiving device and method utilizing semiconductor optical elements and a polarization beam splitter to adjust and spectrally separate TE and TM mode signals, with a control circuit calculating and feedback-controlling the intensity ratio to achieve precise compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If feedback control of polarized wave controller is performed to maximize sum intensity, then PDL is eased, but when input PDL is large, it is difficult to improve polarized state to desired level
Solution Approach 1:
The patent implements feedback control by detecting the intensity ratio between TE and TM mode optical signals and adjusting the semiconductor optical element accordingly. The control circuit calculates the intensity ratio and feeds back control signals to the semiconductor optical element to equalize the intensities, enabling compensation even under large PDL conditions
Solution Approach 2:
The patent changes the operating parameters by monitoring and adjusting the intensity ratio parameter between TE and TM modes. By dynamically adjusting the semiconductor optical element based on the detected intensity ratio, the system adapts to varying PDL conditions and maintains optimal signal quality
2Measurement precision
If variable gain amplifier circuits are used to amplify polarized wave mixed lights, then electric current levels become same, but compensation precision is limited by amplifier gain width
Solution Approach 1:
The patent replaces the mechanical/electrical variable gain amplifier system with an optical-based solution using semiconductor optical elements. This substitution enables more precise intensity control in the optical domain before detection, achieving higher precision compensation without the limitations of electrical amplifier gain bandwidth
3Manufacturing precision
If semiconductor optical element is used for intensity adjustment, then optical intensity ratio can be precisely controlled, but device structure becomes more complex
Solution Approach 1:
The semiconductor optical element serves multiple functions: it acts as both the optical signal source and the intensity control mechanism. By integrating these functions into a single element, the patent achieves precise intensity control while minimizing the overall device structure and avoiding additional complex components
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
Enables high-precision compensation of optical intensity mismatches, resulting in the reception of high-quality polarized optical signals even under significant PDL conditions.
Implementation Method 1
a semiconductor optical element for adjusting optical signal intensity of each of a TE mode and a TM mode of a polarization-multiplexed optical signal
Implementation Method 2
a polarization beam splitter for spectrally separating the polarization-multiplexed optical signal into a TE mode optical signal and a TM mode optical signal
Data Source
AI summary
Provided are a polarization multiplexing optical receiving device and a polarization multiplexing optical receiving method with which a mismatch of optical intensity between polarized signals accumulated in an optical transmission path of an optical receiving system can be compensated with high precision, and a high-quality polarized optical signal can be received.A polarization multiplexing optical receiving device according to the present invention includes: a semiconductor optical element for adjusting the optical signal intensity of each of a TE mode and a TM mode of a polarization-multiplexed optical signal; a polarization beam splitter for spectrally separating the polarization-multiplexed optical signal into the TE mode optical signal and the TM mode optical signal; and a control circuit for calculating the optical intensity ratio between the TE mode optical signal and the TM mode optical signal, which have had the optical signal intensity thereof adjusted by the semiconductor optical element and which have been spectrally separated by the polarization beam splitter, and for performing feedback control of the semiconductor optical element so that the calculated optical intensity ratio reaches a desired value.