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Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures

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All-fiber magneto-optic Sagnac interferometer.

Feng Wen¹, Bao-jian Wu, Te Luo

¹Key Lab of Broadband Optical Fiber Transmission and Communication Networks of the Ministry of Education, University of Electronic Science and Technology of China, Chengdu 611731, China. feng.wen1982@gmail.com

|July 12, 2011

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This study introduces an all-fiber magneto-optic Sagnac interferometer (AFMOSI) using highly nonlinear fibers. The novel AFMOSI demonstrates a significant transmission change in response to magnetic fields, enabling birefringence measurement.

Area of Science:

Photonics and Optical Sensing
Magneto-Optics
Fiber Optics

Background:

Magneto-optic effects are crucial for optical sensing applications.
Sagnac interferometers offer high sensitivity for measuring physical parameters.
Highly nonlinear fibers (HNLFs) enhance light-matter interactions.

Purpose of the Study:

To present the first all-fiber magneto-optic Sagnac interferometer (AFMOSI) utilizing intrinsic Faraday effects in HNLFs.
To theoretically investigate and experimentally verify the performance of the AFMOSI.
To demonstrate the AFMOSI's capability for measuring linear birefringence via magnetic field response.

Main Methods:

Theoretical analysis using the transfer matrix approach.
Experimental validation with an all-fiber magnetic-optic cell (30 m HNLF, 92 mm toroid coil).

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Adjustment of linear birefringence to optimize magnetic field response.

Main Results:

AFMOSI shows over 10 dB transmission change with magnetic induction from 0 to 180 Gs at zero linear birefringence.
Sensitivity is influenced by fiber coupler ratio, loop loss, and HNLF length.
Linear birefringence can be accurately determined from the magnetic field response.

Conclusions:

The developed AFMOSI is a novel and effective tool for magneto-optic sensing.
The ability to measure linear birefringence is a key advantage for nonlinear optical loop mirror applications.
This work advances the understanding and application of Faraday effects in optical fiber systems.