Mid-infrared wavelength multiplexer in InGaAs/InP waveguides using a Rowland circle grating

Area of Science:

• Photonics
• Optoelectronics
• Materials Science

Background:

• Mid-infrared (MIR) spectral range is crucial for various applications including spectroscopy and sensing.
• Integrating multiple laser sources into a single chip offers significant advantages in terms of size, stability, and cost.

Purpose of the Study:

• To demonstrate the monolithic integration of a 15-channel multiplexer on indium phosphide (InP).
• To achieve efficient combination of multiple laser outputs within the 7.1-to-8.5 µm wavelength range.
• To enable the development of a fully integrated broadband laser source in the MIR.

Main Methods:

• Fabrication of a 15-channel multiplexer using indium phosphide.
• Design and implementation of channel spacing at 97 nm.
• Compatibility of fabrication process with active layer growth for laser integration.

Main Results:

• Successful monolithic integration of a 15-channel multiplexer on InP.
• Operation demonstrated across the 7.1-to-8.5 µm wavelength range.
• Accurate channel wavelength spacing (97 nm) achieved, matching design specifications.

Conclusions:

• The developed InP multiplexer is suitable for combining MIR laser outputs.
• The fabrication process allows for the integration of active layers, paving the way for broadband MIR laser sources.
• This technology advances integrated photonics for MIR applications.