Optical ADC Using Interferometers for High-Fidelity Conversion
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Solution Overview
Problem
Conventional electronic analog-to-digital converters (ADCs) face limitations in precision and signal fidelity when converting optical analog signals to digital signals, due to the need for multiple conversions between optical, electrical, and digital domains, which result in power losses and degraded signal quality.
Innovation Solution
An optical analog-to-digital conversion method that maps optical analog signals onto a wavelength modulated optical beam, using interferometers and sample and threshold circuits to generate optical digital signals directly in the optical frequency domain, thereby avoiding power losses associated with optical/electrical and electrical/optical conversions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electronic ADCs are used to convert optical analog signals to digital signals, then the conversion function is achieved, but signal fidelity degrades and power losses occur due to multiple optical/electrical and electrical/optical conversions
Solution Approach 1:
The patent replaces electronic conversion mechanisms with optical processing mechanisms. Instead of converting optical signals to electrical signals and then to digital signals through electronic ADCs, the invention performs analog-to-digital conversion directly in the optical domain using optical interferometers and optical processing, thereby eliminating the harmful optical-electrical-electrical-optical conversion chain and its associated power losses and signal fidelity degradation
Solution Approach 2:
The patent introduces optical interferometers as intermediary devices that enable direct optical domain processing. These interferometers serve as the mediating mechanism that allows analog optical signals to be converted to digital optical signals without requiring electrical domain conversion, thus acting as an intermediary that bypasses the problematic electronic conversion stages
2Measurement precision
If electronic ADCs are used for optical signal conversion, then the conversion function is achieved, but precision decreases with increasing frequency
Solution Approach 1:
The patent substitutes electronic conversion systems with optical conversion systems. By performing analog-to-digital conversion directly in the optical domain using optical interferometers and optical processing techniques, the system achieves high precision conversion at high frequencies without the limitations inherent in electronic ADCs, where precision degrades as frequency increases
Solution Approach 2:
The patent changes the fundamental operating domain from electronic to optical. This parameter change involves operating at optical frequencies rather than electronic frequencies, which enables the system to maintain high precision even at high signal frequencies, overcoming the frequency-dependent precision degradation that plagues electronic ADCs
3Ease of operation
If multiple conversion stages (optical to electrical, electrical to digital, electrical to optical) are used, then the conversion function is achieved, but device complexity increases
Solution Approach 1:
The patent merges multiple separate conversion stages into a single integrated optical domain process. Instead of having separate optical-to-electrical, electrical-to-digital, and electrical-to-optical conversion stages, the invention combines these functions into a unified optical analog-to-digital conversion process that operates entirely in the optical domain, thereby reducing device complexity and improving ease of operation
Solution Approach 2:
The patent extracts and removes the problematic intermediate electrical conversion stages from the conversion chain. By taking out the optical-to-electrical and electrical-to-optical conversion stages and replacing them with direct optical processing, the system simplifies the overall conversion process while maintaining the essential analog-to-digital conversion function
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 enhances the speed and resolution of digitization for optical signals, maintaining signal fidelity and reducing power losses, thereby overcoming the limitations of conventional electronic ADCs.
Implementation Method 1
A conversion apparatus includes a photodiode to receive an optical analog signal
Implementation Method 2
a wavelength modulated laser coupled to the photodiode that maps the optical analog signal received by the photodiode to a wavelength modulated optical beam
Implementation Method 3
interferometers coupled to the wavelength modulated laser with each interferometer having an input coupled to the wavelength modulated laser and an output that produces an analog bit representation signal from the mapped wavelength modulated optical beam
Data Source
AI summary
Methods and apparatus for optical analog to digital conversion are disclosed. An optical signal is converted by mapping the optical analog signal onto a wavelength modulated optical beam, passing the mapped beam through interferometers to generate analog bit representation signals, and converting the analog bit representation signals into an optical digital signal. A photodiode receives an optical analog signal, a wavelength modulated laser coupled to the photodiode maps the optical analog signal to a wavelength modulated optical beam, interferometers produce an analog bit representation signal from the mapped wavelength modulated optical beam, and sample and threshold circuits corresponding to the interferometers produce a digital bit signal from the analog bit representation signal.