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Published on: August 2, 2019
Cross-phase-modulation-based wavelength conversion using intersubband transition in InGaAs/AlAs/AlAsSb coupled
Hidemi Tsuchida1, Takasi Simoyama, Hiroshi Ishikawa
1National Institute of Advanced Industrial Science and Technology, Tsukuba, Japan. h.tsuchida@aist.go.jp
Optics Letters
|March 7, 2007
Summary
We demonstrated ultrafast cross phase modulation in quantum wells, enabling 10 Gbit/s wavelength conversion. This research paves the way for advanced optical signal processing circuits.
Area of Science:
- Optoelectronics
- Quantum Optics
- Semiconductor Physics
Background:
- Intersubband transitions (ISBT) in coupled quantum wells offer unique optical properties.
- Cross phase modulation (XPM) is a key nonlinear optical effect for signal processing.
Purpose of the Study:
- To investigate and demonstrate ultrafast XPM in InGaAs/AlAs/AlAsSb coupled quantum wells.
- To achieve high-speed wavelength conversion using ISBT-based XPM.
- To propose novel optical signal processing circuits leveraging this XPM effect.
Main Methods:
- Utilizing waveguide-type devices for intersubband transitions.
- Employing a transverse-magnetic pump signal to induce phase modulation on a transverse-electric probe signal.
- Characterizing the XPM effect for wavelength conversion performance.
Main Results:
- Observed ultrafast cross phase modulation (XPM) in ISBT of InGaAs/AlAs/AlAsSb coupled quantum wells.
- Achieved 10 Gbit/s wavelength conversion with a low power penalty of 2.53 dB.
- Demonstrated the potential for XPM-based optical signal processing.
Conclusions:
- Ultrafast XPM in ISBT quantum wells is a viable mechanism for high-speed optical communication.
- The developed devices show promise for practical applications in wavelength conversion.
- XPM-based circuits offer new possibilities for optical gate switching and modulation format conversion.
