Optical Phased Array Amplitude Phase Compensation
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Solution Overview
Problem
Next-generation optical phased arrays face challenges in coherently combining incoming optical signals due to amplitude and relative phase modulations caused by atmospheric propagation, leading to performance degradation in optical devices, including reduced range and data rate in free-space optical communication systems.
Innovation Solution
A photonic integrated circuit-based optical communication system with an optical phased array that includes unit cells with antenna elements and phase-shift modulators, which compensates for amplitude and phase modulations across the receive aperture using amplitude adjusters and phase modulators, respectively, to optimize signal levels and phase alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If optical signals are transmitted through free space, then communication range is extended, but amplitude and phase modulations occur due to atmospheric propagation
Solution Approach 1:
The patent applies preliminary action by pre-calculating and applying compensation values for atmospheric-induced amplitude and phase modulations before the optical signals are fully processed. The system uses feedback from detected modulations to adjust subsequent signal processing, effectively compensating for atmospheric effects in advance to maintain signal quality over extended communication ranges.
2Productivity
If optical signals are coherently combined, then data rate is increased, but phase alignment becomes difficult due to atmospheric modulations
Solution Approach 1:
The patent implements feedback mechanisms where the system continuously detects amplitude and phase modulations in the received optical signals and uses this information to adjust compensation parameters. This closed-loop feedback enables automatic phase alignment and maintains coherent combination of optical signals despite atmospheric variations, thereby preserving high data rates without requiring complex manual intervention.
3Reliability
If amplitude and phase compensation is applied, then signal quality is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the compensation mechanism into separate functional modules: amplitude compensation components and phase compensation components. This modular segmentation allows each component to be optimized independently and simplifies the overall system architecture, making the compensation mechanism more manageable and less complex while maintaining signal quality.
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 solution enhances the coherent combination of optical signals, increasing the range and data rate of optical communication systems by compensating for atmospheric-induced modulations, and enables closed-loop adaptive optic control through feedback mechanisms.
Implementation Method 1
a modulator configured to phase-shift the optical signals received by the antenna element
Implementation Method 2
amplitude adjusters configured to modify amplitudes of the combined optical signals in order to compensate for amplitude modulations across a receive aperture
Data Source
AI summary
An apparatus includes a photonic integrated circuit having an optical phased array, where the optical phased array includes multiple unit cells. Each unit cell includes (i) an antenna element configured to receive optical signals and (ii) a modulator configured to phase-shift the optical signals received by the antenna element. Multiple subgroups of the unit cells in the optical phased array are configured to generate multiple combined optical signals based on the received optical signals. The apparatus also includes at least one of: (i) amplitude adjusters configured to modify amplitudes of the combined optical signals in order to compensate for amplitude modulations across a receive aperture of the optical phased array and (ii) phase modulators configured to modify phases of the combined optical signals in order to compensate for phase modulations across the receive aperture of the optical phased array.