Photonic Real-Number Encoding with Coherent Projection Decoding
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Solution Overview
Problem
Conventional optical modulators face challenges in precisely encoding real numbers due to interdependent phase and intensity modulation, leading to dynamic loss and complexity in encoding schemes, especially when using non-ideal modulators that suffer from mutual modulation effects.
Innovation Solution
A photonic system utilizing a single electrical modulating signal to control both the phase and intensity of an optical signal, employing a coherent receiver and optical transformation units with variable beam splitters to perform real-number encoding, which simplifies the encoding process by focusing on the projection of the optical signal onto a selected axis for accurate decoding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional optical modulators are used to encode real numbers, then encoding can be performed, but dynamic loss and encoding complexity increase due to interdependent phase and intensity modulation
Solution Approach 1:
The patent segments the encoding process into two independent parts: phase encoding and intensity encoding. By using separate modulators for each parameter, the interdependent modulation problem is resolved. The phase modulator encodes the real number value while the intensity modulator handles amplitude control, eliminating the dynamic loss and complexity issues of conventional single-modulator approaches.
Solution Approach 2:
The patent introduces an intermediary coherent detection system that measures the projection of the optical signal onto a reference axis. This intermediary measurement approach allows accurate decoding of real numbers even when using non-ideal modulators, as it extracts the encoded information through projection rather than direct measurement, compensating for modulation imperfections.
2Ease of manufacture
If non-ideal modulators are used, then device simplicity is maintained, but dynamic loss and mutual modulation effects worsen encoding accuracy
Solution Approach 1:
The coherent detection system acts as an intermediary that measures the projection of the modulated optical signal onto a reference axis. This projection-based measurement approach is robust against non-ideal modulator characteristics, as it extracts the encoded real number information through geometric projection rather than requiring perfect modulation control, thereby maintaining accuracy despite using practical non-ideal modulators.
Solution Approach 2:
The patent employs feedback mechanisms in the coherent detection and decoding process. The received optical signal is mixed with a reference signal, and the resulting electrical signal is processed to recover the original real number. This feedback loop allows the system to compensate for modulation imperfections and maintain encoding accuracy even with non-ideal modulators.
3Measurement precision
If phase and intensity are modulated independently, then encoding precision is improved, but the number of modulators and system complexity increase
Solution Approach 1:
The patent makes each modulator universal by designing them to perform both phase and intensity modulation capabilities. The first modulator can encode real numbers through phase modulation while also controlling amplitude, and the second modulator provides additional amplitude control. This multi-functionality allows accurate real number encoding without requiring a large number of specialized modulators, balancing precision with component count.
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 encoding and decoding of signed real numbers in the optical domain, even with non-ideal modulators, facilitating applications in telecommunications, computing, and optical machine learning by simplifying the encoding process and reducing the need for complex multi-variable schemes.
Implementation Method 1
modulating, based on the value, a phase of an optical signal and an intensity of the optical signal
Implementation Method 2
modulating, based on the value, a phase of an optical signal and an intensity of the optical signal
Implementation Method 3
mixing the transformed, modulated optical signal with a reference optical signal using a coherent receiver
Implementation Method 4
mixing the transformed, modulated optical signal with a reference optical signal to obtain an electric output signal
Data Source
AI summary
Optical encoders for encoding signed, real numbers using optical fields are described. The optical fields may be detected using coherent detection, without the need for independent phase and amplitude control. This encoding technique enables the use of simple and non-ideal modulators (e.g., modulators that provide neither pure phase nor pure amplitude modulation) for high-precision encoding. A photonic system implementing optical encoding techniques may include a modulator configured to be driven by a single electrical modulating signal and a coherent receiver. An optical transformation unit optically coupled between the modulator and the coherent receiver may transform the phase and/or the intensity of the modulated optical field. The optical encoding techniques described herein may be used in a variety of contexts, including high-speed telecommunications, on chip-phase sensitive measurements for sensing, communications and computing, and optical machine learning.