Study on Mach-Zehnder optical isolator based on magneto-optic photonic crystal fiber

Area of Science:

• Photonics and Optical Engineering
• Materials Science
• Electromagnetism

Background:

• Conventional optical isolators face integration challenges due to reliance on Faraday rotation and external magnetic fields.
• There is a need for compact and efficient optical isolators for advanced fiber optic communication and sensing.

Purpose of the Study:

• To propose and analyze a novel fiber-type optical isolator based on magneto-optic photonic crystal fiber (MO-PCF).
• To enhance non-reciprocal phase shifts (NRPS) for improved isolator performance.

Main Methods:

• Utilized a Mach-Zehnder interferometer configuration with MO-PCF.
• Employed the full-vector finite element method (FV-FEM) for transmission characteristic analysis.
• Designed MO-PCF cores with magnetic and non-magnetic materials to enhance non-reciprocity.

Main Results:

• Achieved a non-reciprocal phase shift (NRPS) per wavenumber of 0.863 × 10^-3 rad/μm.
• Determined a coupling length of 612.3 μm, confirming the optical isolator function.
• Demonstrated enhanced light non-reciprocity by applying a magnetic field perpendicular to polarization and propagation directions.

Conclusions:

• The proposed MO-PCF based optical isolator offers a promising solution for compact and integrated photonic systems.
• The design effectively utilizes NRPS in a Mach-Zehnder configuration for efficient optical isolation.
• This advancement has implications for the development of next-generation fiber optic communication and sensing technologies.