Tunable Laser Adaptive Ring Mirror Wavelength Control
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Solution Overview
Problem
Conventional fiber-optic communication systems using wavelength-division multiplexing face inefficiencies in spectrum utilization and susceptibility to fiber impairments like chromatic dispersion and polarization mode dispersion, particularly for long-distance high-bandwidth transmissions, where precise wavelength and phase control of semiconductor laser outputs are crucial.
Innovation Solution
A tunable semiconductor laser device incorporating an adaptive ring mirror, a gain waveguide, and a booster amplifier, optically coupled with a phase shifter and MMI couplers, allows for adjustable wavelength output based on data streams, enabling coherent fiber-optic communications by controlling reflection characteristics and phase shifts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional fiber-optic communication systems use wavelength-division multiplexing, then data transmission capability is provided, but spectrum utilization efficiency is insufficient and susceptibility to fiber impairments occurs
Solution Approach 1:
The patent implements dynamic wavelength tuning capability in the laser device, allowing the transmission wavelength to be adjusted in real-time based on system requirements. This dynamic adjustment enables the system to adapt to different transmission conditions and mitigate fiber impairments by selecting optimal wavelengths, thereby improving both productivity and reliability simultaneously
Solution Approach 2:
The invention changes the operating parameters of the laser device by implementing tunable wavelength output. By varying the wavelength parameter dynamically, the system can optimize transmission performance for different conditions, improving spectrum utilization efficiency while maintaining data transmission capability and reducing susceptibility to fiber impairments
2Productivity
If precise wavelength and phase control is implemented for long-distance high-bandwidth transmissions, then spectral efficiency improves, but device complexity increases
Solution Approach 1:
The laser device is segmented into distinct functional modules including the gain waveguide, adaptive ring mirror, phase shifter, and MMI coupler. Each module performs a specific function (wavelength selection, phase adjustment, or optical coupling), which simplifies the overall control complexity while enabling precise wavelength and phase control for high spectral efficiency
Solution Approach 2:
The patent introduces an adaptive ring mirror as an intermediary component between the gain waveguide and the output. This ring mirror serves as a wavelength-selective feedback mechanism that simplifies wavelength control by providing automatic wavelength selection through its resonant properties, reducing the complexity of direct wavelength control while maintaining high spectral efficiency
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 tunable laser device enhances spectral efficiency and signal-to-noise ratio in long-distance communications by dynamically adjusting its wavelength output, mitigating fiber impairments and improving throughput.
Implementation Method 1
adjusting a temperature of the adaptive ring mirror based on the stream of data to tune a wavelength of the laser output
Implementation Method 2
optically coupled with a phase shifter and MMI couplers, allows for adjustable wavelength output based on data streams, enabling coherent fiber-optic communications by controlling reflection characteristics and phase shifts
Data Source
AI summary
A tunable laser device is described. In one example, the tunable laser device includes an adaptive ring mirror, a gain waveguide, a loop mirror waveguide, and a booster amplifier waveguide. The gain waveguide and the boost amplifier waveguide can be formed in a semiconductor optical amplifier (SOA) region of the tunable laser device, and the adaptive ring mirror and the loop mirror waveguide can be formed in a silicon photonics region of the tunable laser device. The adaptive ring mirror includes a phase shifter optically coupled between a number of MMI couplers. By inducing a phase shift using the phase shifter, the wavelength of the output of the tunable laser device can be altered or adjusted for use in coherent fiber-optic communications, for example, among other applications.