Variable Branching Optical Transceiver Circuit for PDL Compensation
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Solution Overview
Problem
Current polarization multiplexing optical transmission systems face inefficiencies in power usage and signal quality due to the need for complex design and optimization of branching ratios to compensate for transmission side polarization-dependent loss (PDL), which complicates the design and usage of transceivers, especially in systems requiring different branching ratios for varying transmission distances and power constraints.
Innovation Solution
A polarization multiplexing optical transmitting and receiving circuit is designed with at least three optical branching circuits, including an optical variable branching circuit, to dynamically adjust the branching ratio of light from the light source between the transmission and receiving sides, allowing for compensation of transmission side PDL and optimization of power usage, thereby enhancing signal quality and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complex design and optimization of branching ratios is used to compensate for transmission side PDL, then signal quality is improved, but device complexity increases
Solution Approach 1:
The patent applies dynamics by introducing a variable optical attenuator that can dynamically adjust the branching ratio in real-time. Instead of using complex fixed design optimizations for different transmission scenarios, the system adapts the branching ratio dynamically to compensate for transmission side PDL, thereby simplifying the overall design while maintaining signal quality.
2Device complexity
If fixed branching ratios are used for light source distribution, then device complexity is reduced, but adaptability to different transmission distances and power constraints deteriorates
Solution Approach 1:
The variable optical attenuator enables the branching ratio to be dynamically adjusted according to different transmission distances and power constraints. This dynamic adjustment capability allows the system to adapt to various transmission conditions without requiring multiple fixed designs, thereby maintaining design simplicity while enhancing adaptability.
Solution Approach 2:
The patent changes the parameter of branching ratio from a fixed value to a variable parameter that can be adjusted in real-time. By using a variable optical attenuator, the system can modify the branching ratio parameter to suit different transmission scenarios, achieving both design simplicity and adaptability.
3Reliability
If optical attenuators are added to compensate for PDL, then signal quality is improved, but power consumption increases
Solution Approach 1:
The variable optical attenuator is designed to adjust the branching ratio dynamically and efficiently. By optimizing the attenuation control, the system achieves PDL compensation with minimal power consumption, avoiding the need for multiple fixed attenuators or complex active compensation systems that would consume more power.
Data Source
AI summary
Provided is a polarization multiplexing optical transmitting and receiving circuit that compensates for transmission side PDL so as to suppress a reduction in transmission power and makes a branching ratio of light from a light source variable between a transmission side and a receiving side according to a system to be used. The polarization multiplexing optical transmitting and receiving circuit includes an optical variable branching circuit that branches the light output from the light source, a light fixing symmetric branching circuit connected to one of outputs of the optical variable branching circuit and a light fixing asymmetric branching circuit connected to the other, optical receivers connected to two outputs of the light fixing symmetric branching circuit, respectively, optical transmitters connected to two outputs of the light fixing asymmetric branching circuit, a polarized wave rotator connected to one of the optical transmitters, and a polarized wave multiplexer that polarization-multiplexes the outputs of the optical transmitters.