Simple Gaussian-beam model for GaAlAs double-heterostructure laser-diode-to-diffused-waveguide coupling calculations.

Area of Science:

• Optoelectronics
• Semiconductor Devices
• Photonics

Background:

• Efficient coupling between laser diodes and optical waveguides is crucial for integrated photonic circuits.
• Gallium Aluminum Arsenide (GaAlAs) lasers are widely used in optical communication systems.
• Diffused waveguides offer a cost-effective solution for light manipulation.

Purpose of the Study:

• To evaluate the edge-coupling efficiency between a GaAlAs laser diode and a diffused waveguide.
• To develop and validate a theoretical model for predicting this coupling efficiency.

Main Methods:

• Utilized a Gaussian model to represent both the laser diode output mode and the waveguide mode.
• Performed theoretical calculations based on the Gaussian model parameters.
• Compared calculated results with experimental coupling data.

Main Results:

• The Gaussian model accurately described the laser-output and waveguide modes.
• Calculated coupling efficiencies showed good agreement with previously unpublished experimental data.
• The model provides a reliable method for estimating edge-coupling performance.

Conclusions:

• The Gaussian model is effective for predicting GaAlAs laser-to-diffused-waveguide coupling efficiency.
• This validated model can aid in the design and optimization of optoelectronic devices.
• Accurate coupling efficiency prediction is vital for high-performance integrated photonic systems.