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Effective matching in a nonlinear directional coupler with waveguide mismatching and nonuniform nonlinearity
1Institute of Optics and Photonics, Department of Physics, Shanghai Jiao Tong University, No. 800, Dong Chuan Road, Min Hang, Shanghai 200240, China. jane@sjtu.edu.cn
Applied Optics
|February 1, 2005
Summary
Researchers show how to achieve complete power transfer in nonlinear directional couplers by adjusting mismatching and nonuniformity. This method works for variable coupling coefficients, including Gaussian and exponential types.
Area of Science:
- Nonlinear optics
- Waveguide optics
- Photonics
Background:
- Nonlinear directional couplers are key components in photonic integrated circuits.
- Mismatches and nonuniformities typically hinder efficient power transfer in these devices.
Purpose of the Study:
- To investigate the behavior of nonlinear directional couplers with variable coupling coefficients, mismatching, and nonuniformity.
- To determine if complete power transfer can be achieved despite these imperfections.
Main Methods:
- Analysis using coupled mode equations.
- Introduction of an effective mismatching parameter.
- Numerical simulations to validate theoretical findings.
Main Results:
- Effective mismatching can be canceled by adjusting mismatching and nonuniformity magnitudes.
- Complete power transfer is demonstrated for mismatched and nonuniform couplers.
- Success is shown for both Gaussian and exponential variable coupling coefficients.
Conclusions:
- The study presents a method to overcome imperfections in nonlinear directional couplers.
- Achieving complete power transfer is feasible through careful control of device parameters.
- This finding has implications for designing advanced photonic devices.