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Dispersion compensation by two vertically coupled asymmetric ridge waveguides.
Yong Lee1, Tomoyoshi Mishima, Shinya Kominami
1Central Research Laboratory, Hitachi, Ltd., 1-280 Higashi-Koigakubo, Kokubunji-shi, Tokyo 185-8601, Japan. yongl@crl.hitachi.co.jp
Applied Optics
|August 3, 2004
Summary
Researchers demonstrated dispersion compensation using coupled asymmetric waveguides. This method achieved significant pulse compression, highlighting the role of supermodes in the process.
Area of Science:
- Optoelectronics
- Photonics
- Materials Science
Background:
- Dispersion management is crucial for high-speed optical communications.
- Asymmetric coupled waveguides offer unique optical properties for dispersion control.
Purpose of the Study:
- To demonstrate dispersion compensation using vertically coupled InGaAsP/InP asymmetric ridge waveguides.
- To investigate the role of waveguide supermodes in pulse compression.
Main Methods:
- Fabrication of two vertically coupled InGaAsP/InP asymmetric ridge waveguides.
- Experimental demonstration of dispersion compensation with a 3.3-ps chirped pulse.
- Theoretical analysis of supermode behavior in coupled waveguides.
Main Results:
- Achieved significant pulse compression (62% compression ratio).
- Demonstrated effective dispersion compensation using the engineered waveguide structure.
- Confirmed the important role of supermodes in the pulse compression mechanism.
Conclusions:
- Vertically coupled asymmetric ridge waveguides are effective for dispersion compensation.
- Supermode analysis provides insight into pulse compression in such structures.
- This technique has potential applications in optical signal processing.