Broadband Frequency Modulated Laser with Multi-Actuator Segmentation
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Solution Overview
Problem
Existing techniques fail to produce highly precise and accurate broadband frequency modulated lasers with linear frequency chirps over bandwidths greater than 50 GHz, experiencing deviations from linearity of more than 1%, which is crucial for applications like LADAR and spectral analysis.
Innovation Solution
A tunable laser system with multiple drive inputs and an optical detector, along with a laser controller, is used to generate a series of signals that cause the laser to produce a waveform with alternating increasing and decreasing optical frequencies, ensuring precise control over the optical frequency modulation across large bandwidths by compensating for dispersion and systematic errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If previous feedback techniques are used for laser frequency tuning, then frequency stability and linearity are improved, but the tuning bandwidth is limited to less than 50 GHz
Solution Approach 1:
The patent segments the broadband frequency tuning range into multiple frequency response bands, each handled by a dedicated drive input with its own actuation range. This allows the system to maintain precise linear control in each segment while achieving overall broadband coverage exceeding 50 GHz, resolving the contradiction between linearity and bandwidth.
Solution Approach 2:
The patent implements dynamic switching between multiple drive inputs based on the current operating frequency band. The laser controller dynamically selects and switches between different actuation ranges to match the desired frequency response band, enabling the system to adaptively maintain optimal linearity across the entire broadband range while achieving tuning bandwidths greater than 50 GHz.
2Adaptability or versatility
If broadband chirps greater than 50 GHz are produced using existing methods, then tuning bandwidth is improved, but deviations from linearity increase to 1% or more
Solution Approach 1:
The patent applies local quality by optimizing the frequency response characteristics for each specific band within the broadband range. Each drive input is tailored with specific frequency response characteristics and actuation ranges suited to its local frequency region, ensuring high linearity accuracy (better than 1% deviation) in each local segment while maintaining overall broadband capability.
Solution Approach 2:
The patent employs feedback mechanisms within each frequency response band to actively correct and maintain chirp linearity. The laser controller uses detector signals and frequency response information to dynamically adjust drive inputs, compensating for deviations and ensuring that linearity accuracy remains better than 1% across the entire broadband range exceeding 50 GHz.
3Measurement precision
If multiple drive inputs with different frequency response bands are used, then broadband precise tuning is achieved, but device complexity increases
Solution Approach 1:
The laser controller is designed with multi-functionality to handle multiple drive inputs and frequency response bands through a unified control architecture. The controller integrates frequency response band management, actuation range switching, and linearity correction functions into a single versatile device, reducing overall system complexity despite the need for precise broadband tuning across multiple bands.
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 system achieves a linear chirp with accuracy better than 1% over bandwidths greater than 50 GHz, enhancing the precision of applications such as LADAR and spectral analysis by minimizing deviations from linearity and stabilizing the optical frequency waveform.
Implementation Method 1
an optical detector configured to detect the optical frequency of light output by the laser
Implementation Method 2
a tunable laser having a plurality of drive inputs for affecting an optical frequency of light output by the laser
Data Source
AI summary
A method and apparatus are described including a laser with a plurality of internal or external actuators for affecting an optical frequency of light output by the laser, wherein the plurality of actuators have a corresponding plurality of different frequency response bands for changing optical properties of the laser and a corresponding plurality of actuation ranges of optical frequencies affected. Also included is an optical detector, and a plurality of optical paths configured to direct light output by the laser onto the detector. A laser controller is configured to provide a plurality of inputs to the plurality of actuators based on a detector signal output from the optical detector and the corresponding frequency response bands and actuation ranges.