WDM Optical Receiver Polarization Splitting Gain Control
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Solution Overview
Problem
The existing wavelength division multiplexing optical receivers with polarization diversity configuration face issues of increased cost, power consumption, and reduced receiver sensitivity due to the need for double the number of semiconductor optical amplifiers (SOAs) and amplified spontaneous emission (ASE) noise, which lowers the optical signal-noise intensity ratio (OSNR).
Innovation Solution
A wavelength division multiplexing optical receiver configuration that uses a polarization splitting optical coupler to separate signal light into polarized components, with separate semiconductor optical amplifiers for each component, and a control circuit to adjust the drive current based on the intensity ratio of the monitor outputs, allowing for different optical gains and reducing the power consumption by driving only one SOA at a time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If polarization dependent SOAs are arranged in the output waveguides of the polarization splitting grating coupler to amplify WDM signal light, then optical gain is provided to compensate transmission loss, but the number of SOA elements doubles and power consumption doubles
Solution Approach 1:
The patent implements dynamic control of SOA drive currents based on real-time monitoring of polarized wave intensity ratios. The control circuit adjusts the drive current to each SOA dynamically, allowing one SOA to be driven at high current when its corresponding polarization component is strong, while the other SOA is driven at low or zero current when its polarization component is weak, thereby reducing total power consumption while maintaining required optical gain
Solution Approach 2:
The patent changes the operating parameters (drive current) of the SOAs based on the intensity ratio of polarized wave components. By monitoring the intensity ratio and adjusting the drive current accordingly, the system optimizes the optical gain provided by each SOA to match the actual signal requirements, avoiding unnecessary power consumption from uniformly driving both SOAs at high current
2Loss of energy
If polarization dependent SOAs are arranged in the output waveguides to amplify signal light, then optical gain is achieved, but the amount of ASE noise doubles and OSNR decreases by 3 dB
Solution Approach 1:
The patent dynamically adjusts the drive current parameter of each SOA based on the monitored intensity ratio of polarized wave components. When one polarization component is strong and the other is weak, the corresponding SOA is driven at high current while the other is driven at low or zero current, thereby reducing the total ASE noise generated while maintaining sufficient optical gain for signal compensation
3Adaptability or versatility
If the same drive current is provided to polarization dependent SOAs to provide equal optical gain to both polarized components, then polarization independence is achieved, but power consumption is excessive
Solution Approach 1:
The patent changes the drive current parameter of each SOA based on the intensity ratio of polarized wave components. Instead of providing the same drive current to both SOAs, the system dynamically adjusts each SOA's drive current according to the actual intensity of its corresponding polarization component, maintaining polarization independence in terms of signal handling while significantly reducing power consumption
Solution Approach 2:
The patent implements a feedback control mechanism where the intensity ratio of polarized wave components is monitored and used to adjust the drive current to each SOA. This feedback loop ensures that the optical gain provided by each SOA is optimized according to the actual signal conditions, maintaining polarization independence while minimizing power consumption
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 configuration reduces power consumption and maintains receiver sensitivity by selectively driving semiconductor optical amplifiers based on the intensity ratio of polarized wave components, thereby minimizing ASE noise and maintaining constant optical gain, resulting in improved OSNR.
Implementation Method 1
a polarization splitting optical coupler configured to separate wavelength division multiplexing signal light into respective polarization components
Implementation Method 2
a first semiconductor optical amplifier configured to amplify a first polarization component that has been separated by the polarization splitting optical coupler
Implementation Method 3
a photodetector configured to detect the outputs of the wavelength demultiplexer for the respective wavelengths
Data Source
AI summary
The invention relates to a wavelength division multiplexing optical receiver that is provided with a polarization splitting grating coupler and a driving method for the same, where the power consumption is reduced, and at the same time, a degradation in the receiver sensitivity is suppressed. Two monitor photodetectors configured to monitor the light intensity of a first polarization component and a second polarization component separated by a polarization splitting optical coupler are provided, and a control circuit is provided in order to allow a semiconductor optical amplifier that amplifies the first polarization component and another semiconductor optical amplifier that amplifies the second polarization component in accordance with the signal intensity ratio of the two monitor photodetectors to amplify light with different light gains.