Field-driven all-optical wavelength converter using novel InGaAsP/InAlGaAs quantum wells

Area of Science:

• Optoelectronics
• Semiconductor Physics
• Photonics

Background:

• High-speed all-optical wavelength converters (AOWCs) are crucial for advanced optical communication networks.
• Existing AOWC technologies face limitations in speed and efficiency, necessitating novel material and device designs.
• Quantum well (QW) structures offer tunable optoelectronic properties for enhanced device performance.

Purpose of the Study:

• To propose and demonstrate a new semiconductor quantum well (QW) structure for high-speed all-optical wavelength converters (AOWCs).
• To achieve efficient and high-speed photocarrier sweep-out using field-driven tunneling in a multiple QW structure.
• To validate the device's performance for high-data-rate optical signal processing.

Main Methods:

• Fabrication of an optical waveguide device utilizing InGaAsP (well)/InGaAlAs (barrier) multiple QWs.
• Integration of a high-speed electrode connection for electrical field application.
• Characterization of the device's optoelectronic response, including bandwidth, sweep time, and all-optical conversion efficiency.

Main Results:

• Demonstrated a -3dB bandwidth of 38 GHz with an 8V bias, indicating high-speed operation.
• Observed a photocarrier sweep time of less than 10 ps, consistent with field-driven tunneling.
• Achieved error-free 40 Gb/s data transmission with a -11 dB conversion efficiency in system performance.

Conclusions:

• The novel InGaAsP/InGaAlAs multiple QW structure enables high-speed photocarrier sweep-out, crucial for efficient AOWC operation.
• The demonstrated device exhibits excellent high-speed performance and error-free data transmission capabilities.
• This AOWC technology holds significant potential for future applications, including 100 Gb/s optical communication systems.