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Related Experiment Video

Updated: Jul 31, 2025

Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy

Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy

Published on: November 22, 2019

Ultra-low-loss broadband multiport optical splitters.

Paloma Vildoso, Rodrigo A Vicencio, Jovana Petrovic

|May 9, 2023

Summary

We developed an efficient inverse design algorithm for optical splitters, enabling universal designs that meet multiple requirements like arbitrary splitting ratios and low loss. This method significantly speeds up the design process compared to traditional nanophotonic approaches.

Area of Science:

Photonics and Nanotechnology
Optical Engineering

Background:

Designing optical splitters with multiple constraints (splitting ratio, insertion loss, bandwidth, footprint) is challenging.
Existing nanophotonic inverse design methods are resource-intensive, requiring significant time and energy.
Traditional designs often fail to meet all functional requirements simultaneously.

Purpose of the Study:

To present an efficient inverse design algorithm for universal optical splitter designs.
To overcome limitations of traditional and current inverse design methods in terms of speed and resource consumption.
To achieve optical splitters that are platform-nonspecific and meet diverse functional constraints.

Main Methods:

Developed an efficient inverse design algorithm for optical splitters.

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Fabricated 1xN power splitters using direct laser writing on a borosilicate platform.

Applied the universal design algorithm to silicon nitride and silicon-on-insulator platforms.

Main Results:

Achieved optical splitters with zero loss (within experimental error), low imbalance (<0.5 dB), and broad bandwidth (20-60 nm around 640 nm).
Demonstrated tunable splitting ratios and scalable splitter footprints.
Designed compact 1x5 splitters on silicon nitride (3.3 µm × 8 µm) and silicon-on-insulator (2.5 µm × 10.3 µm) platforms.
The algorithm runs in minutes on a standard PC, offering 100x greater throughput than nanophotonic inverse design.

Conclusions:

The proposed efficient inverse design algorithm provides universal optical splitter designs meeting multiple constraints.
This method significantly reduces design time and computational resources.
The approach is versatile, applicable to various platforms and adaptable for different splitting ratios and footprints.