Adjustable Optical Signal Delay via Chromatic Dispersion and Phase Modulation
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Solution Overview
Problem
Current methods for delaying optical pulses are either complex, expensive, or limited in bandwidth and flexibility, making them unsuitable for practical applications in optical communications and other technologies that require flexible and efficient optical storage and delay.
Innovation Solution
The method involves splitting the optical signal into frequency components using chromatic dispersion, applying a phase modulation with a linear phase response, and then compensating the dispersion to achieve adjustable and flexible delay times, allowing for high-bandwidth and low-power operation using standard optical communications components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If chromatic dispersion is used to delay optical pulses, then the delay time can be extended, but the pulse becomes distorted
Solution Approach 1:
The patent divides the optical signal into multiple frequency components using a diffraction grating, processes each frequency component separately through individual delay lines, and then recombines them. This segmentation allows each frequency component to be delayed without mutual interference, maintaining pulse shape while achieving extended delay times
Solution Approach 2:
The patent introduces an intermediary processing stage between dispersion and recombination, where frequency components are separated and individually delayed. This intermediary step prevents the cumulative distortion that would occur with direct long-duration dispersion, enabling both extended delay and pulse integrity
2Adaptability or versatility
If standard optical fiber waveguides are used for delay, then the system is flexible and broadband, but distortion-free delays of more than one bit are not possible
Solution Approach 1:
The patent segments the broadband optical signal into multiple frequency components that can be independently processed. By dividing the signal spectrum and applying separate delay mechanisms to each segment, the system achieves distortion-free delays exceeding one bit duration while maintaining the broadband capabilities of standard optical fibers
Solution Approach 2:
The patent transitions from temporal domain processing to frequency domain processing by using a diffraction grating to spatially separate frequency components. This dimensional transformation from time to frequency-spatial domain enables independent control of each frequency component, achieving both broadband operation and extended distortion-free delay
3Duration of action of moving object
If stimulated Brillouin scattering is used to store pulses in optical fiber, then storage is achieved, but high optical power of several watts is required
Solution Approach 1:
The patent replaces the nonlinear optical mechanism of stimulated Brillouin scattering with a linear optical processing approach using diffraction gratings and passive delay lines. This substitution eliminates the need for high optical power (several watts) while achieving comparable storage and delay functionality using standard low-power optical components
4Duration of action of moving object
If Bose-Einstein condensates are used for light storage, then light pulses can be stored for a short time, but high experimental effort is required
Solution Approach 1:
The patent employs inexpensive, readily available optical components (diffraction gratings, optical fibers, delay lines) instead of complex Bose-Einstein condensate systems. These simple components achieve sufficient storage and delay functionality without requiring sophisticated experimental setups, making the system practical for real-world applications
Solution Approach 2:
The patent creates a self-contained optical processing system where the diffraction grating automatically separates frequency components and the passive delay lines inherently provide the required time delays. The system requires no external control mechanisms or complex experimental conditions, operating autonomously with minimal intervention
5Duration of action of moving object
If frequency conversion methods are used to achieve delay, then delays of up to 720 ns can be set, but at least two additional lasers with smallest possible linewidth and optical filters and amplifiers are required
Solution Approach 1:
The patent uses a universal diffraction grating component that simultaneously performs frequency separation, spatial dispersion, and routing functions. This single component replaces the need for multiple specialized components (additional lasers, filters, amplifiers) required in frequency conversion methods, achieving complex delay functionality with minimal structural complexity
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 approach enables efficient and flexible delay of optical signals with minimal structural complexity and power requirements, supporting high-bit-rate data transmission and enabling applications in optical communications, phased array antennas, and optical sampling without signal loss or distortion.
Implementation Method 1
The input signal is split up into frequency components by chromatic dispersion of an optical fiber
Implementation Method 2
application of a phase modulation with a linear phase response to at least individual frequency components
Implementation Method 3
the dispersion is compensated for again by exposing the signal processed in this way to an element with a corresponding dispersion of the opposite sign
Data Source
Figure 1a~2
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AI summary
The invention relates to a method for delaying a signal in the form of a light pulse or a pulse packet, wherein the signal for splitting up the frequency components is first of all exposed to an element having a strong chromatic dispersion, wherein at least individual frequency components of the split signal are subjected to a modulation and wherein, in order to compensate the dispersion generated, the signal thus processed is exposed to an element having a corresponding dispersion with a reverse sign.