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InP-based compact transversal filter for monolithically integrated light source array.

Yuta Ueda, Takeshi Fujisawa, Kiyoto Takahata

|April 11, 2014

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Researchers created compact indium phosphide (InP) wavelength multiplexers using multi-mode interference couplers. A reflection-type design achieved ultra-compact sizes, suitable for integrated light sources in 100G bit Ethernet.

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Area of Science:

Photonics and Optical Engineering
Integrated Optics
Semiconductor Devices

Background:

Compact wavelength multiplexers (MUXs) are crucial for high-speed optical communication systems.
Indium phosphide (InP) is a key material for integrated photonic devices due to its optoelectronic properties.

Purpose of the Study:

To develop a compact InP-based 4x1 transversal filter (TF) utilizing multi-mode interference couplers (MMIs).
To achieve an ultra-compact MUX by converting the MMI-based TF into a reflection-type configuration.

Main Methods:

Fabrication of an InP-based 4x1 transversal filter (TF) incorporating multi-mode interference couplers (MMIs).
Conversion of the MMI-based TF into a reflection-type MUX.
Characterization of the wavelength filtering performance.

Main Results:

Development of a compact MMI-based MUX measuring 1700 μm x 400 μm.
Achieved an ultra-compact reflection-type MUX with dimensions of 900 μm x 50 μm.
Demonstrated satisfactory wavelength filtering operation for both designs.

Conclusions:

The developed InP-based MUXs offer a simple fabrication process and compact footprint.
These MUXs are suitable for monolithic integration with light source arrays, particularly for applications like 100G bit Ethernet.