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Condition for the realization of a temperature-insensitive long-period waveguide grating

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Abstract

We analyze the condition for achieving a temperature-insensitive resonance wavelength of a long-period grating formed in a channel waveguide. We find that by controlling the waveguide cladding thickness, zero temperature sensitivity can be achieved with core and cladding materials that have significantly different thermo-optic coefficients. To verify our finding, we design a polymer long-period waveguide grating (LPWG) according to the zero-sensitivity condition, where the thermo-optic coefficient of the core is twice that of the cladding. The temperature sensitivity of the fabricated grating is within ±0.15nm°C over a temperature range of 15°C, which is more than an order of magnitude lower than those of previously reported LPWGs fabricated with the same materials.

© 2006 Optical Society of America

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