Differentiating optical-fiber Mach-Zehnder interferometer

Area of Science:

• Optics and Photonics
• Fiber Optic Sensors
• Interferometry

Background:

• Conventional Mach-Zehnder interferometers can experience signal loss due to wide phase variations.
• Accurate measurement of phase differentials is crucial in various sensing applications.

Purpose of the Study:

• To introduce a new optical-fiber Mach-Zehnder interferometer design.
• To enable measurement of phase differentials and their rate of change.
• To simplify interferometer operation and signal processing.

Main Methods:

• Analysis of a prototype interferometer architecture.
• Derivation of design formulas for the new interferometer.
• Experimental evaluation of a practical configuration.

Main Results:

• The novel interferometer's output is sensitive to phase differentials or the rate of change of phase-modulating signals.
• Differential phase shifts can be confined to the linear range of the phase detector, improving accuracy.
• The system operates without active biasing, additional phase modulation, or complex signal processing.

Conclusions:

• The proposed optical-fiber Mach-Zehnder interferometer offers a simple and effective method for measuring phase differentials.
• Its design overcomes limitations of conventional interferometers, enabling more robust signal detection.
• The technology is suitable for applications requiring precise measurement of phase-modulating signals.