Digital Input Circuit Design for Photonic Integrated Circuits
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Solution Overview
Problem
Next-generation optical phased arrays (OPAs) require efficient and scalable designs for controlling optical signals, particularly in photonic integrated circuits (PICs), to enable high-speed beam forming and beam steering with minimal mechanical disturbances and adaptive optics compensation, while existing solutions face challenges in calibrating large numbers of array elements effectively.
Innovation Solution
A digital input circuit design for photonic integrated circuits (PICs) is introduced, featuring multiple DRIIC cells associated with each array element to control phase modulators, enabling electronic control of antenna elements for beam shaping and steering, and using digital holography for phasing control of large arrays, along with advanced calibration techniques for concurrent calibration of multiple elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional control circuits are used for each array element, then the number of circuit components increases, but the calibration complexity and device area increase significantly
Solution Approach 1:
The patent divides the control system into multiple DRIIC cells, where each cell is associated with one array element and contains its own phase modulator control circuitry. This segmentation allows independent calibration of each cell while maintaining overall system precision, resolving the contradiction between control precision and calibration complexity.
Solution Approach 2:
The patent introduces DRIIC cells as intermediary components between the digital input signals and the phase modulators. These cells act as mediators that simplify the control interface and reduce the complexity of direct calibration between external circuits and array elements, while preserving beam control precision.
2Productivity
If more array elements are added to increase data rate, then the bandwidth increases, but the calibration difficulty and time increase
Solution Approach 1:
By segmenting the array into multiple independently controllable DRIIC cells, the patent enables parallel calibration processes. Each cell can be calibrated simultaneously without interfering with others, allowing the system to scale to higher data rates without proportionally increasing calibration time.
Solution Approach 2:
The patent implements preliminary calibration procedures during manufacturing where DRIIC cells are pre-calibrated and stored with their calibration data. This preliminary action eliminates the need for time-consuming calibration during field deployment, enabling high data rates without calibration time penalties.
3Speed
If conventional phase modulator control is used, then the system is simple, but mechanical disturbances and inertia affect beam control speed
Solution Approach 1:
The patent replaces mechanical beam control mechanisms with electronic phase modulation through DRIIC cells. This substitution eliminates mechanical inertia and disturbances entirely, enabling high-speed beam control through purely electronic means while maintaining system simplicity.
Data Source
AI summary
A device includes a photonic integrated circuit having an optical phased array. The optical phased array includes multiple array elements, where each array element includes (i) an antenna element configured to transmit or receive optical signals and (ii) a phase modulator configured to phase-shift the optical signals transmitted or received by the antenna element. The device also includes multiple digital register in integrated circuit (DRIIC) cells, where each DRIIC cell is associated with one of the array elements. The DRIIC cells are configured to receive digital inputs and to provide outputs to the phase modulators of the associated array elements in order to control the phase-shifts of the optical signals transmitted or received by the antenna elements based on the digital inputs.