Multipath Integrated Optical Network for Distance Measurement
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Solution Overview
Problem
Current integrated photonics platforms face limitations in accurately measuring the distance of remote objects due to constraints in temporal resolution and modulation capabilities, particularly in achieving sub-pulse scale modulations efficiently.
Innovation Solution
A multi-path integrated optical network (MION) is developed, incorporating optical delay elements, couplers, and directional couplers on a photonic substrate to generate and combine weighted delayed optical signals, enabling precise modulation and demodulation of optical pulses with sub-pulse temporal resolution, thereby enhancing distance measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional electro-optical modulators are used for optical signal modulation, then the system structure is relatively simple, but the temporal resolution and modulation capabilities are insufficient for accurate distance measurement
Solution Approach 1:
The patent divides the optical signal processing into multiple discrete delay elements (N delay elements providing different time delays τ₁, τ₂, ..., τₙ) and separate optical modules for modulation. Each delay element processes a specific time window of the optical pulse, enabling sub-pulse temporal resolution through parallel processing of segmented signal components.
Solution Approach 2:
The patent transitions from traditional temporal modulation to a multi-dimensional approach by introducing multiple delay paths with different time delays simultaneously. This creates a temporal-spatial dimension where signals are modulated across multiple time channels, achieving finer resolution without proportionally increasing complexity.
2Measurement precision
If sub-pulse scale modulations are achieved using traditional methods, then measurement precision improves, but the modulation efficiency and system complexity increase significantly
Solution Approach 1:
The patent replaces traditional electro-optical modulation mechanisms with a purely optical delay-line based modulation system. Optical switches and delay elements operate at optical speeds without electrical conversion, eliminating bandwidth limitations and achieving efficient sub-pulse scale modulation directly in the optical domain.
Solution Approach 2:
The system pre-calculates and pre-positions multiple delayed versions of the optical pulse through the N delay elements before modulation occurs. This preliminary arrangement of temporal channels allows the modulation to happen efficiently in parallel across all channels simultaneously, rather than sequentially processing each time point.
3Adaptability or versatility
If multiple optical delay elements and modules are integrated, then the modulation capability and temporal resolution are enhanced, but the device complexity increases
Solution Approach 1:
The patent designs optical modules that serve multiple functions: delay elements provide both time delay and signal routing, optical switches perform both switching and modulation, and the same N delay elements are used for both transmitting and receiving operations. This multi-functionality reduces the number of dedicated components needed.
Solution Approach 2:
The patent combines the transmitting and receiving systems into a single integrated platform where the same N optical delay elements and optical modules serve both functions. The system uses bidirectional optical connections to share hardware resources, reducing overall integration complexity while maintaining full modulation and demodulation capabilities.
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 MION system provides accurate and efficient distance measurements of remote objects by resolving time-of-flight with finer time resolutions, surpassing the capabilities of traditional electro-optical modulators and achieving enhanced correlation properties.
Implementation Method 1
N optical delay elements adapted to receive a different fraction of the optical pulse and delay the optical pulse by a different time period
Implementation Method 2
N optical couplers adapted to receive a different fraction of the optical pulse
Implementation Method 3
an optical combiner adapted to combine different fractions of the delayed optical pulse to generate the modulated optical signal
Implementation Method 4
N directional couplers adapted to apply a different weight to a different one of the N delayed optical signals
Implementation Method 5
The optical radiator is configured to transmit (radiate) the modulated optical signal
Implementation Method 6
The optical receiver is configured to receive a reflection of the transmitted signal
Implementation Method 7
a down-converter adapted to down-convert a frequency of the demodulated signal to generate an electrical signal
Data Source
AI summary
A photonics sensing system includes, in part, first and second multipath integrated optical networks, an optical radiator, and an optical receiver. The first multipath integrated optical network includes, in part, N optical delay elements each supplying one of N delayed optical signals of a received optical pulse, N optical modules each supplying a portion of a different one of the N delayed optical signals, and an optical combiner adapted to combine the N delayed portions to generate a modulated optical signal. The smallest of the N delays is smaller than a width of the received optical pulse. The optical radiator is adapted to radiate the modulated optical signal. The optical receiver is adapted to receive a reflection of the transmitted signal. The second multipath integrated optical network is adapted to demodulate the reflected signal received by the optical receiver.