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Standing Waves in a Cavity

Standing Waves in a Cavity

A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:

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Area of Science:

Photonics and Optoelectronics
Semiconductor Device Physics
Materials Science

Background:

Monolithic integration of photonic devices is crucial for advanced optical systems.
Quantum well intermixing (QWI) offers a pathway for fabricating complex photonic integrated circuits.
Electro-absorption modulated lasers (EMLs) require careful design to balance lasing and modulation.

Purpose of the Study:

To investigate the impact of QWI on the performance of identical-active electro-absorption modulated lasers (IA-EMLs).
To optimize the QWI process for reducing absorptive waveguide regions in IA-EMLs.
To compare modulation characteristics of IA-EMLs with different QWI strategies.

Main Methods:

Fabrication of IA-EMLs utilizing QWI in targeted regions.
Comparative analysis of IA-EMLs with QWI in waveguide only, waveguide and electro-absorption modulator (EAM) regions, and no QWI.
Characterization of modulation performance, including driving voltage and extinction ratio.

Main Results:

QWI effectively suppresses unwanted absorption in the waveguide region of IA-EMLs.
IA-EMLs with QWI solely in the waveguide region demonstrated superior modulation performance.
Optimized QWI resulted in lower driving voltages and a higher extinction ratio.

Conclusions:

Selective QWI is a highly effective technique for mitigating waveguide absorption in IA-EMLs.
The proposed method enhances modulation characteristics, paving the way for improved photonic devices.
This approach simplifies the fabrication process for advanced photonic integrated circuits.