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Design of polarization-insensitive Bragg gratings in zero-birefringence ridge waveguides

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2 Author(s)
Wa Peng Wong ; Dept. of Electron. Eng., City Univ. of Hong Kong, China ; Kin Seng Chiang

Addresss the problem of designing polarization-insensitive Bragg gratings in zero-birefringence ridge waveguides. It is known that the reflection spectrum of a Bragg grating is be polarization-independent if both the phase-matching condition and the coupling coefficient are polarization-independent. While the use of a zero-birefringence waveguide can guarantee a polarization-independent phase-matching condition, it does not in general lead to a polarization-independent coupling coefficient. Our theoretical analysis indicates, however, that a strictly polarization-independent coupling coefficient is not essential for the achievement of a polarization-insensitive Bragg grating. Our detailed calculations on both corrugation and phase gratings in zero-birefringence ridge waveguides reveal some general design principles. Our results should be useful for the design of a wide range of Bragg-grating-based waveguide devices

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Quantum Electronics, IEEE Journal of  (Volume:37 ,  Issue: 9 )