Optical Transceiver Splitting Ratio Control for Coherent Reception
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Solution Overview
Problem
In optical transceivers using a shared light source for transmission and reception, the fixed splitting ratio of optical couplers can result in inadequate power for coherent reception, leading to declined reception performance due to individual device variations and power imbalances.
Innovation Solution
An optical transceiver with a light source, optical splitting means, modulation means, and control means that adjusts the splitting ratio of the optical coupler based on the reception characteristics of the received light to optimize power distribution for coherent reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed splitting ratio optical coupler is used to split light source output, then the device structure is simple, but the local light source power cannot be adjusted to fall within the suitable range for coherent reception
Solution Approach 1:
The patent applies the dynamics principle by replacing the fixed splitting ratio optical coupler with a variable optical attenuator in the local light source path. This allows the splitting ratio to be dynamically adjusted based on reception conditions, enabling the local light source power to be optimized for coherent reception while maintaining a relatively simple device structure.
2Reliability
If the splitting ratio is fixed, then the device complexity is low, but reception performance declines due to power imbalance from individual device variations
Solution Approach 1:
The patent implements feedback control by monitoring the reception characteristic (such as signal quality or power level) and using this information to adjust the variable optical attenuator. This closed-loop feedback mechanism ensures that the local light source power is continuously optimized to maintain reliable reception performance despite individual device variations or changing operating conditions.
Solution Approach 2:
The patent applies parameter changes by varying the attenuation level of the variable optical attenuator based on reception characteristics. This allows the system to adapt the local light source power parameter dynamically, compensating for individual device variations and ensuring optimal reception performance without requiring complex hardware modifications.
3Use of energy by moving object
If more power is allocated to transmission light source, then transmission distance is extended, but local light source power becomes insufficient for coherent reception
Solution Approach 1:
The patent resolves this power distribution conflict by making the splitting ratio dynamic through the variable optical attenuator. Instead of a fixed power split, the system can dynamically adjust the proportion of power allocated to the local light source based on actual reception needs, allowing flexible power management that maintains both transmission range and reception quality.
Solution Approach 2:
The patent enables adaptive power distribution by changing the attenuation parameter of the variable optical attenuator according to reception characteristics. This allows the system to optimize the power split between transmission and reception functions dynamically, ensuring sufficient power for both transmission distance extension and coherent reception quality maintenance.
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
This approach effectively suppresses the decline in reception performance by dynamically adjusting the splitting ratio to ensure optimal local light power for coherent detection, maintaining performance across varying conditions.
Implementation Method 1
coherent reception means for causing input reception light to interfere with the second split light
Implementation Method 2
a light source (local light source) for heterodyne detection of an optical signal (reception light) received from the optical transmission path
Data Source
AI summary
In order to suppress any reduction in the reception performance of an optical transceiver, the optical transceiver includes a light source, an optical splitter that splits the output of the light source into a first split light and a second split light, an optical modulation unit that modulates the first split light, a coherent receiver that causes the inputted received light to interfere with the second split light, and a first control unit that controls the split ratio of the optical splitter on the basis of the reception characteristic of the received light received by the coherent receiver.