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A Compact SLED Light Source Driver Module for Optical Coherence Tomography Applications.

Yuanhao Cao1, Feng Liu2, Jianguo Mei2

  • 1College of Optical Science and Engineering, Ningbo Global Innovation Center, Zhejiang University, Ningbo 315100, China.

Sensors (Basel, Switzerland)
|April 14, 2026
PubMed
Summary

A new, compact driver module for superluminescent light-emitting diodes (SLEDs) enhances optical coherence tomography (OCT) imaging. This stable SLED driver ensures high-quality OCT diagnostics by precisely controlling current and temperature, simplifying complex systems.

Keywords:
analog PIDconstant-current drivelightweight designsuperluminescent light-emitting diode (SLED)temperature control

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Area of Science:

  • Biomedical Optics
  • Optical Engineering
  • Medical Imaging Technology

Background:

  • Optical Coherence Tomography (OCT) relies on stable Superluminescent Light-Emitting Diodes (SLEDs) for high-resolution imaging.
  • SLED stability is critical for OCT imaging quality, directly linked to drive current and operating temperature.
  • Current SLED driver solutions often involve complex microcontrollers or FPGAs, hindering simplicity and control precision.

Purpose of the Study:

  • To develop a stable, compact SLED source driver module specifically for OCT systems.
  • To integrate constant-current drive and temperature control circuits into a simplified, precise module.
  • To overcome the limitations of existing complex SLED driving and temperature control schemes.

Main Methods:

  • Implemented a constant-current drive circuit with negative feedback control and current-limiting protection for stable SLED operation.
  • Utilized a miniature dedicated temperature control chip and linearized Negative Temperature Coefficient (NTC) thermistor readings.
  • Employed a Proportional-Integral-Derivative (PID) compensation circuit for precise temperature regulation of the SLED.

Main Results:

  • The fabricated module achieved a drive current control accuracy of 0.1% and temperature control accuracy of 0.01 °C.
  • Output optical power fluctuation was minimal, less than 0.005 mW.
  • Achieved an average axial resolution of 6.5992 μm (SD 0.0107 μm) in OCT imaging.

Conclusions:

  • The developed SLED driver module successfully balances high control precision with structural simplicity.
  • This compact and stable SLED source driver demonstrates excellent applicability and potential for enhancing OCT systems.
  • The module offers a simplified yet effective solution for critical SLED parameter control in OCT applications.