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High-speed polarization tracking using thin film lithium niobate integrated dynamic polarization controller.
Optics Express
|December 2, 2023
Summary
This study introduces a fast thin film lithium niobate (TFLN) integrated dynamic polarization controller (DPC) using Jacobian control. It achieves high-speed polarization tracking, demonstrating TFLN
Area of Science:
- Photonics and Optical Engineering
- Materials Science
- Control Systems
Background:
- Dynamic polarization controllers (DPCs) are critical for stabilizing light polarization in optical systems.
- Existing DPCs face limitations in tracking speed and control loop delay.
- Thin film lithium niobate (TFLN) offers a promising platform for integrated photonic devices.
Purpose of the Study:
- To develop and demonstrate a high-speed integrated DPC using TFLN.
- To implement a real-time Jacobian control algorithm for rapid polarization tracking.
- To evaluate the performance of the TFLN-based DPC in terms of speed, delay, and stability.
Main Methods:
- Fabrication of an integrated DPC on a TFLN platform.
- Implementation of a real-time Jacobian control algorithm.
- Experimental characterization of polarization tracking speed, control loop delay, and polarization restoring time.
Main Results:
- Achieved a polarization tracking speed of 100 krad/s.
- Demonstrated a low control loop delay of 420 ns.
- Observed a fast polarization restoring time of 1.6 µs with low control voltages (2.75 V).
Conclusions:
- The TFLN-based integrated DPC significantly outperforms previous devices in tracking speed and loop delay.
- The Jacobian control algorithm is effective for fast polarization tracking in integrated photonic devices.
- TFLN technology shows great potential for advancing high-performance DPC solutions.
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