Laser Light Source With Optical Intensity Adjusting Section
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Solution Overview
Problem
Conventional methods for controlling the optical frequency of semiconductor lasers require complex feedback circuits, limiting response speed and preventing high-speed modulation.
Innovation Solution
A light source apparatus that includes a laser light source and an optical intensity adjusting section to compensate for intensity changes caused by frequency changes, allowing for constant output intensity and high-speed frequency modulation without a complex feedback circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If feedback control is used to maintain constant output light intensity, then output intensity stability is improved, but device complexity increases and response speed is limited
Solution Approach 1:
The patent extracts the feedback control function from a complex electronic control circuit and implements it through optical domain processing. By using an optical coupler to extract a portion of the output light and an optical detector to convert it to an electrical signal, the system achieves intensity stabilization without requiring complex electronic feedback circuits, thus reducing device complexity while maintaining stability.
Solution Approach 2:
The patent substitutes electronic feedback control with an optical-based control mechanism. By using optical coupling and optical detection followed by simple electrical signal processing, the system replaces the need for complex electronic feedback circuits, achieving both simplicity and high response speed.
2Stability of the object's composition
If feedback control circuit is used, then output intensity stability is improved, but response speed is limited by circuit bandwidth
Solution Approach 1:
The patent substitutes electronic feedback control with an optical-based control mechanism. By using optical coupling and optical detection followed by simple electrical signal processing, the system replaces the need for complex electronic feedback circuits, achieving both simplicity and high response speed.
Solution Approach 2:
The patent introduces an optical coupler and optical detector as intermediary elements between the laser diode and the control system. These intermediaries enable high-speed optical signal extraction and conversion to electrical signals, allowing the system to respond rapidly to intensity changes without being limited by direct electronic feedback circuit bandwidth.
3Adaptability or versatility
If drive current is changed to modulate optical frequency, then frequency modulation capability is improved, but output light intensity changes
Solution Approach 1:
The patent implements feedback control by detecting the output light intensity through an optical detector and using the detected signal to adjust the drive current. This feedback mechanism automatically compensates for intensity changes caused by frequency modulation, maintaining constant output intensity while enabling frequency modulation capability.
Solution Approach 2:
The patent introduces an optical coupler and optical detector as intermediary elements between the laser diode and the control system. These intermediaries enable high-speed optical signal extraction and conversion to electrical signals, allowing the system to respond rapidly to intensity changes without being limited by direct electronic feedback circuit bandwidth.
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
Enables high-speed modulation of optical frequency with constant output intensity, eliminating the need for complex feedback circuits and allowing for both constant and intensity-modulated light sources.
Implementation Method 1
a laser light source section (120) that outputs laser light having an optical frequency corresponding to the frequency control signal
Implementation Method 2
an optical amplification section (134) that amplifies input light by an amplification factor corresponding to an intensity control signal
Data Source
AI summary
[PROBLEM] Providing an optical source that outputs optical frequency modulated light having a constant output optical intensity.[MEANS FOR SOLVING THE PROBLEM] Provided is a light source apparatus that outputs an optical signal having an optical frequency corresponding to a frequency control signal, the light source apparatus including a laser light source section that outputs laser light having an optical frequency corresponding to the frequency control signal; and an optical intensity adjusting section that compensates for intensity change of the laser light to output laser light in which the intensity change caused by a change in the optical frequency is restricted. The optical intensity adjusting section includes an optical amplification section that adjusts an amplification factor of the laser light from the laser light source section, based on the frequency control signal, to restrict the intensity change of laser light corresponding to the frequency control signal, and outputs the resulting laser light.