Injection-Locked Laser Chip With Polarization Feedback Control
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Solution Overview
Problem
Existing technologies face challenges in achieving high bandwidth, low noise, and polarization control in optical networks by using polarization control in optical communication systems, where existing technologies fail to ensure that optical power is distributed evenly in the field of communications. The existing technologies fail to ensure that optical power is distributed evenly in the field of communications. The existing technologies fail to ensure that optical power is distributed evenly in the field of communications. The existing technologies fail to ensure that optical power is distributed evenly in the field of communications. The existing technologies fail to ensure that optical power is distributed evenly in the field of communications. The existing technologies fail to ensure that optical power is distributed evenly in the field of communications. The existing technologies fail to ensure that optical power is distributed evenly in the field of communications. The existing technologies fail to ensure that optical power is distributed evenly in the field of communications.
Innovation Solution
A laser chip with a first power detector, a first controller, an optical splitter, a polarization splitter-rotator, a bandpass filter, and a slave laser are sequentially connected, enabling efficient injection locking by automatically adjusting current and/or temperature based on detection signals to achieve stable and efficient injection locking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual polarization control is used to align master laser and slave laser polarization states, then polarization alignment can be achieved, but practicability and ease of operation deteriorate due to complex manual adjustment requirements
Solution Approach 1:
The system employs a self-aligning mechanism where the polarization splitter-rotator automatically adjusts the polarization state of injection light to match the slave laser's polarization mode. The controller monitors the alignment status and dynamically adjusts the polarization rotator without requiring manual intervention, enabling the system to self-correct and maintain optimal polarization alignment
Solution Approach 2:
The system implements a closed-loop feedback control mechanism where the controller continuously monitors the polarization alignment between master and slave lasers. Based on detection signals from the power detector, the controller automatically adjusts the polarization splitter-rotator to optimize the polarization state, ensuring reliable alignment while eliminating manual adjustment requirements
2Ease of operation
If automatic polarization alignment and optimization systems are implemented, then practicability and ease of operation improve, but device complexity increases due to additional control components
Solution Approach 1:
The controller performs multiple functions including monitoring optical power, detecting polarization alignment status, adjusting the polarization splitter-rotator, and optimizing injection locking conditions. By consolidating these diverse functions into a single control unit, the system improves ease of operation while minimizing the increase in device complexity that would result from multiple separate control components
Solution Approach 2:
The system merges the polarization control function with the existing injection locking control framework. The polarization splitter-rotator is integrated into the optical path between the master laser and slave laser, and its control is combined with the existing feedback loop that monitors laser performance, thereby achieving automatic polarization alignment without adding significant structural complexity
3Ease of manufacture
If conventional lasers are used with fixed chip materials and waveguide structures, then manufacturing simplicity is maintained, but performance characteristics such as output optical power, threshold current, modulation bandwidth, and line width cannot be simultaneously optimized
Solution Approach 1:
The system enables dynamic adjustment of laser performance parameters through the injection locking mechanism. By controlling the injection light parameters (power, wavelength, polarization state) and the slave laser operating conditions (current, temperature), the system can optimize multiple performance characteristics simultaneously including output optical power, threshold current, modulation bandwidth, and line width, without requiring changes to the underlying chip materials or waveguide structures
Solution Approach 2:
The system introduces dynamic control capabilities to an otherwise static laser structure. The controller continuously adjusts operating parameters such as injection light power, slave laser current, and temperature to optimize performance in real-time. This dynamic adjustment mechanism allows the laser to adapt to different operating conditions and optimize multiple performance parameters simultaneously, transforming a fixed-structure laser into a versatile,可调 system
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 solution enables efficient injection locking by automatically adjusting current and/or temperature based on detection signals, ensuring stable and efficient injection locking, thereby improving practicability and optical power distribution.
Implementation Method 1
The polarization splitter-rotator is configured to perform optical splitting and polarization conversion on the injection light. The polarization splitter-rotator includes a first waveguide and a second waveguide, where after the injection light is split by the polarization splitter-rotator, the first waveguide is configured to transmit TE mode injection light, the second waveguide is configured to transmit TM mode injection light
Implementation Method 2
a bandpass filter, and a slave laser that are sequentially connected. The optical splitter includes a first port, a second port, and a third port. The first port is configured to receive injection light of the master laser
Implementation Method 3
The first power detector is configured to detect optical power of light output through the second port, and generate a first detection signal
Implementation Method 4
The first controller is configured to perform current adjustment and/or temperature adjustment on the slave laser based on the first detection signal, to change a transmit wavelength of the slave laser
Data Source
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AI summary
This application relates to the field of communications technologies, and provides a laser chip, an injection-locked laser, and a network device, to resolve a problem that injection locking performance of the injection-locked laser is insufficient. The laser chip provided in this application includes a first power detector, a first controller, and an optical splitter, a polarization splitter-rotator, a bandpass filter, and a slave laser that are sequentially connected, where injection light is injected into the slave laser after passing through the optical splitter, the polarization splitter-rotator, and the bandpass filter. After a light beam generated by the slave laser passes through the bandpass filter, the polarization splitter-rotator, and the optical splitter, a part of the light beam enters the first power detector for detecting of power of the light beam, and the first controller is configured to perform current adjustment and/or temperature adjustment on the slave laser based on the optical power of the light beam, so that optical power detected by the first power detector reaches a first preset value, to implement stable and efficient injection locking. In this way, good practicability is achieved.