Dual-diode quantum-well modulator for C-band wavelength conversion and broadcasting

Area of Science:

• Photonics
• Optoelectronics
• Materials Science

Background:

• Integrated optoelectronics are vital for high-speed optical communication networks.
• Quantum-well modulators and photodiodes are key components in optical signal processing.
• Efficient wavelength conversion and broadcasting are essential for increasing fiber optic capacity.

Purpose of the Study:

• To present a novel dual-diode InGaAsP/InP quantum-well modulator integrated with an InGaAs photodiode.
• To theoretically and experimentally demonstrate the modulator's capabilities for wavelength conversion and broadcasting.
• To evaluate the performance in terms of RF-extinction ratio, optical power consumption, and data rates.

Main Methods:

• Fabrication of a monolithic InP optoelectronic circuit combining a dual-diode modulator and a photodiode.
• Theoretical analysis of the dual-diode modulator for wavelength conversion performance.
• Experimental demonstration of wavelength conversion and dual-wavelength broadcasting at various data rates and optical powers.

Main Results:

• Theoretical prediction of 10-dB RF-extinction ratio for wavelength conversion at 10 Gb/s with 7 mW absorbed optical power.
• Experimental demonstration of unlimited wavelength conversion over 45 nm (1525-1570 nm).
• Experimental demonstration of dual-wavelength broadcasting over 20 nm (1530-1565 nm) with >10 dB RF-extinction ratio at 1.25 Gb/s using 3.1-6.7 mW absorbed optical power.

Conclusions:

• The integrated dual-diode modulator offers efficient wavelength conversion and broadcasting capabilities.
• The device operates effectively across the entire C-band, suitable for optical communication systems.
• Low absorbed optical power requirements indicate potential for energy-efficient optical signal processing.