Free-Space Optical Transceiver Alignment via Dynamic Beam Divergence
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Solution Overview
Problem
Free-space optical communication systems face limitations in range due to atmospheric attenuation and are sensitive to misalignment, particularly caused by wind-induced swaying of optical transceivers.
Innovation Solution
The system employs an optical transceiver with an optical transmitter and receiver configured for alignment, using techniques such as filtering of electrical measurements in a narrower frequency band, optical mode demultiplexing, and adjusting the light beam's direction and divergence based on feedback to compensate for misalignments and atmospheric conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If free-space optical links are used to achieve high bit rates, then data transmission speed is improved, but the range is limited due to atmospheric attenuation and sensitivity to misalignment
Solution Approach 1:
The system performs preliminary alignment actions before full data transmission begins. The optical transceivers execute alignment routines that adjust beam direction and divergence parameters in advance, ensuring proper alignment is established before high-speed data communication starts, thereby preventing transmission failures due to misalignment
Solution Approach 2:
The system implements continuous feedback mechanisms during alignment and operation. The optical receiver provides feedback signals to the transmitter about received signal quality and alignment status, allowing real-time adjustments to beam direction and divergence to maintain optimal performance despite atmospheric conditions or physical disturbances
2Productivity
If narrow beam divergence is used to improve data rate, then transmission efficiency is improved, but sensitivity to misalignment increases
Solution Approach 1:
The system dynamically adjusts beam divergence based on operational conditions. During alignment phases, the beam divergence is temporarily increased to reduce sensitivity to misalignment and facilitate easier coupling. Once alignment is achieved, the divergence is reduced to narrow beams for high-data-rate transmission, optimizing both alignment ease and transmission efficiency at different operational stages
Solution Approach 2:
The system changes key optical parameters including beam divergence angle and direction during operation. By dynamically modifying these parameters in response to feedback about alignment status and atmospheric conditions, the system can maintain high data rates while compensating for misalignment through parameter adjustment rather than requiring fixed precision
3Reliability
If alignment procedures are made more complex to compensate for wind-induced swaying, then reliability is improved, but device complexity increases
Solution Approach 1:
The alignment system is designed to be self-adjusting through automatic feedback loops. The optical transceivers autonomously perform alignment adjustments based on received feedback signals without requiring external intervention or complex manual calibration procedures. The system self-corrects for wind-induced swaying and other disturbances through automated control algorithms that adjust beam parameters in real-time
Data Source
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AI summary
An apparatus comprising: an optical transceiver comprising an optical transmitter and an optical receiver, the optical transceiver being configured to perform alignment of the optical transmitter and of the optical receiver, with respect to a remote optical device comprising a remote optical transceiver, and configured to perform bi-directional free-space optical data communication with the remote optical device; and wherein during the alignment, the optical receiver is configured to perform at least one of: filtering of electrical measurements of an optical signal received from the remote optical transceiver in a narrower frequency band than during the bi-directional free-space optical data communication; and optical mode demultiplexing of an optical signal from a multimode optical waveguide configured to receive the optical signal from the remote optical transceiver.