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High-speed all-optical modulation using an InGaAs/AlAsSb quantum well waveguide.

Kazi S Abedin¹, Guo-Wei Lu, Tetsuya Miyazaki

¹Photonic Network Group, National Institute of Information and Communications Technology, 4-2-1 Nukui-Kitamachi, Koganei, Tokyo 184-8795, Japan. abedin@nict.go.jp

|June 26, 2008

Summary

This study demonstrates all-optical cross-phase modulation in InGaAs/AlAsSb quantum wells. The findings enable efficient simulation of intersubband transition modulators for optical signal processing.

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Area of Science:

Optics and Photonics
Semiconductor Physics
Quantum Electronics

Background:

Intersubband transitions (ISBT) in coupled quantum wells offer unique optical properties.
All-optical modulation is crucial for high-speed optical signal processing.

Purpose of the Study:

To investigate all-optical cross-phase modulation (XPM) in InGaAs/AlAsSb coupled quantum wells.
To determine the efficiency of XPM for potential modulator applications.
To derive a transfer function for ISBT modulators.

Main Methods:

Utilizing a sinusoidal intensity-modulated pump laser.
Employing probe waves in the 1330-1620 nm wavelength range.
Operating the pump modulation at a 76 GHz repetition rate.

Main Results:

Achieved cross-phase modulation (XPM) with an efficiency (eta) ranging from 0.653 to 0.142 rad/W.
Demonstrated efficient all-optical modulation via intersubband transitions.
Derived a practical transfer function for ISBT modulators.

Conclusions:

The study confirms the feasibility of all-optical XPM in InGaAs/AlAsSb coupled quantum wells.
The derived transfer function facilitates the simulation and design of advanced optical modulators.
This research contributes to the development of high-performance optical communication and processing devices.