Compact deterministic liquid-crystal polarization controller with single-measurement direct control

• URL: http://arxiv.org/abs/2607.20987v1
• Date: Thu, 23 Jul 2026 07:11:34 GMT
• Title: Compact deterministic liquid-crystal polarization controller with single-measurement direct control
• Abstract summary: This work presents a compact deterministic liquid-crystal polarization controller (LC-PC) with balanced overall performance.<n>The device exhibits highly predictable and repeatable polarization modulation characterized by SOP-independent trajectory normal vectors.
• Score: 16.37289119618359
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Polarization controllers (PCs) and their control algorithms are critical for compensating environmental disturbances and maintaining signal fidelity in polarization-sensitive photonic systems. However, existing controllers often involve trade-offs among key performance metrics, while associated control algorithms either converge inefficiently or require multiple state-of-polarization (SOP) measurements. This work presents a compact deterministic liquid-crystal polarization controller (LC-PC) with balanced overall performance, featuring low insertion loss (<1 dB), low driving voltage (<6 V), and full Poincaré sphere coverage. The device exhibits highly predictable and repeatable polarization modulation characterized by SOP-independent trajectory normal vectors, enabling a single-measurement direct-calculation algorithm with an angular error below 2°. The combination of this compact deterministic LC-PC and its efficient control scheme provides a practical solution for polarization management in quantum key distribution, optical sensing, and advanced photonic systems.

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