Optical Phased Array Beam Steering for Wireless Optical Links
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Solution Overview
Problem
Existing wireless optical communication systems face challenges in accurately maintaining beam alignment over long distances due to the narrow angular width of the transmitted beam, requiring complex and costly steering mechanisms, and are prone to errors from environmental disturbances.
Innovation Solution
A free-space optical communication system utilizing an optical phased array (OPA) chip with phase shifters and a transceiver chip, integrated with processors for wavefront correction, which measures and adjusts the phase front of incoming beams to correct wavefront errors, allowing for electronic or mechanical steering to maintain beam alignment without the need for separate alignment components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If small mirrors (MEMS or voice-coil based fast-steering mirror mechanisms) are used to steer the beam, then beam alignment can be maintained, but device complexity and cost increase
Solution Approach 1:
The patent replaces mechanical steering mirrors (MEMS or voice-coil based fast-steering mirror mechanisms) with an optical phased array that uses electro-optic phase shifting to steer beams. This substitution eliminates moving parts while maintaining beam steering capability, thereby reducing device complexity and cost while preserving alignment reliability
Solution Approach 2:
The patent changes the control parameter from mechanical mirror positioning to electro-optic phase shifting. By controlling the phase of light at each array element, the beam direction can be dynamically adjusted without mechanical movement, resolving the contradiction between alignment maintenance and device complexity
2Device complexity
If electro-optic steering with Optical Phased Arrays is used, then cost and device complexity are reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent implements adaptive calibration procedures where the optical phased array system automatically measures and compensates for its own manufacturing errors. The system characterizes phase errors and geometric deviations during operation and applies correction algorithms, allowing standard manufacturing tolerances to achieve high-precision beam steering without requiring extremely tight manufacturing precision
3Productivity
If narrow angular width beams are transmitted for high gain, then communication throughput is improved, but beam alignment accuracy requirements increase
Solution Approach 1:
The patent employs feedback mechanisms where the receiving terminal sends alignment error information back to the transmitting terminal. The optical phased array uses this feedback to continuously adjust beam pointing, maintaining high gain narrow beams for throughput while automatically compensating for alignment deviations through real-time feedback control
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 reduces the number of optical components, assembly tolerances, and costs, while maintaining high data rates and sensitivity, and supports both intensity modulation and coherent systems, enabling efficient and accurate beam steering with reduced errors and environmental sensitivity.
Implementation Method 1
Each active element in the OPA requires electro-optic phase shifting capability
Implementation Method 2
a plurality of lenses forming a telescope that captures light from free space and transmits light from the OPA chip
Implementation Method 3
a single mode waveguide connecting the OPA chip and the single mode circulator
Implementation Method 4
control the steering mirror to adjust a wavefront or pointing direction of the first signal and the second signal
Data Source
AI summary
A free-space optical communication system includes an optical phased array (OPA) photonic integrated chip, a transceiver photonic integrated chip, and one or more processors. The OPA chip includes a plurality of array elements and a plurality of phase shifters. The transceiver chip includes one or more transmitter components and one or more receiver components. The one or more processors are configured to transmit a first signal via the OPA chip and the transceiver chip, and receive a second signal via the OPA chip and the transceiver chip.