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Related Experiment Video

Updated: Jun 19, 2026

Implementation of a Reference Interferometer for Nanodetection

Implementation of a Reference Interferometer for Nanodetection

Published on: April 26, 2014

Error Analysis and Suppression of Rectangular-Pulse Binary Phase Modulation Technology in an Interferometric

Qian Cheng¹, Hong Ding¹, Xianglei Pan²

¹School of Physical Science and Technology, Nantong University, Nantong 226019, China.

Sensors (Basel, Switzerland)

|August 14, 2025

Summary

This summary is machine-generated.

The rectangular-pulse binary phase modulation (RPBPM) method enhances fiber-optic sensing by offering high efficiency and low complexity. An improved ellipse fitting technique boosts signal quality, proving its practical application in vibration systems.

Keywords:

fiber-optic sensor interferometer phase demodulation phase modulation

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Area of Science:

Optics and Photonics
Sensor Technology

Background:

Interferometric fiber-optic sensing relies on phase-shifting techniques for signal retrieval.
Rectangular-pulse binary phase modulation (RPBPM) is a key phase-shifting method known for efficiency and simplicity.

Purpose of the Study:

To analyze the impact of sampling interval and modulation depth deviation on RPBPM performance.
To validate the superiority of RPBPM compared to heterodyne and phase-generated carrier methods.
To propose an improved RPBPM method for error compensation and enhanced signal quality.

Main Methods:

Detailed analysis of RPBPM parameter influence.
Comparative simulation with traditional heterodyne and phase-generated carrier methods.
Development of an ellipse fitting technique for Lissajous figures.

Main Results:

RPBPM demonstrates significant advantages in efficiency, complexity, and multiplexing.
The improved ellipse fitting method enhanced the signal-to-noise-and-distortion ratio (SINAD) from 26.3 dB to 37.1 dB.
Experimental validation confirmed excellent performance in a practical vibration sensing system.

Conclusions:

RPBPM is a highly effective phase-shifting technique for fiber-optic sensing.
The proposed ellipse fitting method significantly improves accuracy and signal quality.
The RPBPM method with ellipse fitting shows great potential for practical applications in vibration sensing.