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The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry

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Published on: August 12, 2013

Sagnac interferometer based flat-top birefringent interleaver.

Chao-Wei Lee, Ruibo Wang, Pochi Yeh

|June 12, 2009

Summary

This summary is machine-generated.

We developed a novel Sagnac interferometer optical interleaver using a ring-cavity for a flat-top spectral passband. This design offers high channel isolation and avoids complex thin-film coatings.

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Area of Science:

Photonics
Optical Engineering
Interferometry

Background:

Optical interleaving is crucial for increasing channel capacity in fiber optic communication systems.
Existing interleaver designs often require precise thin-film coatings, increasing manufacturing complexity and cost.

Purpose of the Study:

To propose and demonstrate a novel Sagnac interferometer-based flat-top birefringent optical interleaver.
To utilize a ring-cavity as a phase-shift element to achieve a flat-top spectral passband without complex coatings.

Main Methods:

A Sagnac interferometer incorporating birefringent crystals was employed to create optical path differences.
A ring-cavity was integrated to provide necessary phase shifts for a flat-top spectral response.
Fresnel reflections at the prism-air interface of the ring cavity were utilized for phase shifting.

Main Results:

The proposed interleaver achieved a 0.5-dB passband wider than 0.145 nm for a 25-GHz channel spacing.
A stop band greater than 0.145 nm with 25-dB attenuation was demonstrated.
Channel isolation exceeding 36 dB across the C-band was achieved.

Conclusions:

The novel Sagnac interferometer-based optical interleaver offers a robust and effective solution for high-performance optical networking.
The design simplifies manufacturing by leveraging Fresnel reflections, eliminating the need for precise thin-film coatings.
The device exhibits excellent performance metrics, suitable for C-band applications, with manageable dispersion characteristics.