Optical gain in 1.3-μm electrically driven dilute nitride VCSOAs

Area of Science:

• Optoelectronics
• Semiconductor Physics
• Materials Science

Background:

• Vertical cavity semiconductor optical amplifiers (VCSOAs) are crucial for optical communication.
• Dilute nitride materials offer tunable properties for optoelectronic devices.
• Room-temperature operation is highly desirable for practical applications.

Purpose of the Study:

• To investigate room-temperature optical gain in electrically driven dilute nitride VCSOAs.
• To analyze the effect of injected power on optical gain.
• To compare the performance of devices with and without a confinement aperture.

Main Methods:

• Fabrication of dilute nitride VCSOAs.
• Electrical pumping and optical gain measurements at room temperature.
• Gain calculation as a function of injected power.
• Comparison between devices with and without confinement apertures.

Main Results:

• Observation of optical gain at 1.3 μm in room-temperature operation.
• Maximum gain of nearly 10 dB achieved at lower injected powers for both sample types.
• Gain decrease observed at injection powers exceeding 5 nW.
• Slightly higher gain consistently observed in the sample with a confinement aperture.

Conclusions:

• Electrically driven dilute nitride VCSOAs demonstrate viable room-temperature optical gain.
• Confinement apertures can enhance optical gain in these devices.
• Device performance is sensitive to injected power levels, with saturation effects observed.