Ring-Resonator Laser Feedback Layout for Narrow Linewidth Control
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Solution Overview
Problem
Existing laser light sources face challenges in narrowing spectral line width due to difficulties in adjusting oscillation frequency and limited frequency modulation range, especially when extending the resonator length, and suffer from high power loss and increased power consumption in optical negative feedback configurations.
Innovation Solution
A laser light source incorporating a resonance unit with a light emitter, a ring resonator, and an optical negative feedback unit, where the light emitter is directly connected to a waveguide and the optical negative feedback unit is connected to the opposite end, reducing the light path length and power loss, and utilizing ring resonators and directional couplers to control frequency and power distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the length of the resonator is extended to narrow the spectral line, then the line width is reduced, but the frequency modulation range becomes narrow and oscillation frequency adjustment becomes difficult
Solution Approach 1:
The resonator is divided into multiple sections with different functions: a long resonator section for narrowing spectral line width, and a separate frequency adjustment section that allows independent oscillation frequency tuning without affecting the line width narrowing effect
Solution Approach 2:
An optical negative feedback unit is introduced as an intermediary component that receives light from the resonator and feeds it back to the light emitter. This mediator enables frequency modulation and stabilization without requiring changes to the resonator length, thus maintaining both narrow line width and frequency adjustability
2Manufacturing precision
If optical negative feedback is used to narrow the spectral line, then the line width is reduced, but power loss increases and power consumption rises
Solution Approach 1:
The optical feedback amount is made adjustable by changing parameters of the optical negative feedback unit, allowing optimization of the balance between line width narrowing effect and power loss. The system can operate at different feedback levels depending on the required line width and acceptable power consumption
Solution Approach 2:
The optical negative feedback unit incorporates adjustable parameters that allow dynamic optimization of feedback strength. This enables the system to adapt the feedback level to minimize power loss while achieving the desired spectral line width, rather than using fixed strong feedback that always causes high power loss
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 effectively narrows the spectral line width, reduces power loss, and facilitates frequency control, providing a more efficient and adjustable laser light source with improved power consumption management.
Implementation Method 1
a ring resonator arranged between the first waveguide and the second waveguide. The light from the light emitter resonates between the first reflector and the second reflector by the ring resonator
Implementation Method 2
a first reflector configured to reflect light emitted by the light emitter and input the reflected light to the first waveguide... a third reflector connected to the third waveguide. The light from the third reflector is inputted to the first waveguide via the third waveguide
Implementation Method 3
an optical negative feedback unit... The light from the third reflector is inputted to the first waveguide via the third waveguide
Data Source
AI summary
A laser light source includes: a resonance unit with a light emitter; and an optical negative feedback unit. The resonance unit includes: a first waveguide; a first reflector to input the reflected light to the first waveguide; a second waveguide; a second reflector connected to the second waveguide; and a ring resonator between the first waveguide and the second waveguide. The light from the first reflector is blocked from the ring resonator and partially transmitted to a first end of the first waveguide opposite to a second end connected to the light emitter and the first reflector. The optical negative feedback unit includes: a third waveguide to which the light transmitted to the first end of the first waveguide is inputted; and a third reflector connected to the third waveguide. The light from the third reflector is inputted to the first waveguide via the third waveguide.