Thermally tunable lithium-niobate long-period waveguide grating filter fabricated by reactive ion etching
Research output: Journal Publications and Reviews (RGC: 21, 22, 62) › 21_Publication in refereed journal › peer-review
Author(s)
Related Research Unit(s)
Detail(s)
Original language | English |
---|---|
Pages (from-to) | 484-486 |
Journal / Publication | Optics Letters |
Volume | 35 |
Issue number | 4 |
Publication status | Published - 15 Feb 2010 |
Link(s)
Abstract
We fabricate a long-period grating band-rejection filter with a lithium niobáte (LiNbO8) channel waveguide, where the grating is formed on the waveguide surface by plasma reactive ion etching. The filter shows three distinct thermal tuning regimes. Below ∼55°C, the center wavelength of the rejection band decreases linearly with an increase in the temperature at a high sensitivity (-1.4 nm/°C). The temperature sensitivity drops abruptly to a negligible value at ∼ 55 °C and stays low up to ∼70°C, above which it jumps abruptly to a large positive value (1.6 nm/°C). We attribute these peculiar tuning characteristics to the formation of different crystal phases in the core and cladding areas of the LiNbO 3 waveguide and the abrupt transitions of the thermo-optic coefficients of some crystal phases. The grating could be developed into various kinds of integrated-optic filters and switches for application in optical signal processing. © 2010 Optical Society of America.
Citation Format(s)
Thermally tunable lithium-niobate long-period waveguide grating filter fabricated by reactive ion etching. / Jin, Wei; Chiang, Kin Seng; Liu, Qing.
In: Optics Letters, Vol. 35, No. 4, 15.02.2010, p. 484-486.Research output: Journal Publications and Reviews (RGC: 21, 22, 62) › 21_Publication in refereed journal › peer-review