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Cyclic silicon waveguide four-mode converter for mode division multiplexing transmission.

Zhe Yuan, Yongchen Wang, Hangming Fan

|October 13, 2022

Summary

A novel cyclic mode converter (CMC) enables on-chip cyclic mode permutation (CMP) for mode division multiplexing (MDM) systems. This device effectively eliminates differential mode delay and mode-dependent loss, enhancing transmission performance.

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Area of Science:

Optical Engineering
Photonics
Telecommunications

Background:

Mode division multiplexing (MDM) systems face challenges with differential mode delay and mode-dependent loss.
Efficient on-chip mode conversion is crucial for advancing MDM technology.

Purpose of the Study:

To propose and fabricate a novel cyclic mode converter (CMC) for on-chip cyclic mode permutation (CMP).
To eliminate differential mode delay and mode-dependent loss in MDM systems.

Main Methods:

Design and fabrication of a CMC using cascaded, optimally designed mode converters.
Utilized three-dimensional finite-difference time-domain (3D-FDTD) simulations for performance analysis.
Experimental validation of the fabricated CMC.

Main Results:

Simulated insertion loss below 0.59 dB and crosstalk below -15 dB across 1500-1600 nm.
Demonstrated robust, flat spectral response with fabrication errors up to ±10 nm.
Experimental results show insertion loss below 2.22 dB and crosstalk below -15 dB at 1550 nm.

Conclusions:

The proposed CMC effectively implements on-chip CMP for TE0/TE1/TM0/TM1 modes.
The device offers a novel solution for reducing link impairments in MDM transmission systems.
The CMC exhibits high performance and robustness, suitable for practical applications.