Acta Optica Sinica, Volume. 35, Issue 3, 313002(2015)
Design and Analysis of Photorefractive Long-Period Waveguide Grating Coupler
To obtain an easily made grating coupler with stable materials, a proposal to fabricate photorefractive long- period gratings coupler on Ti- diffused LiNbO3 waveguide is presented. Structural parameters of the coupler can be determined by using effective index method and coupled- mode theory, including grating period as 74.28 mm, separation distance of two waveguides as 8 mm and the minimum grating length for 100% coupling as 2.42 cm. The transmission spectrum is analysed and the 3-dB bandwidth can reach 5.20 nm. The simulation results also show that coupling efficiency is above 90% when tolerance of grating length and offset distance is 0.37 cm and 0.21 cm, respectively. The coupler is expected to be used in coarse wavelength division multiplexing system.
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Zhang Ming, Ren Jianwen, Chen Wen, Le Zichun. Design and Analysis of Photorefractive Long-Period Waveguide Grating Coupler[J]. Acta Optica Sinica, 2015, 35(3): 313002
Category: Integrated Optics
Received: Sep. 1, 2014
Accepted: --
Published Online: Feb. 5, 2015
The Author Email: Ming Zhang (cim2046@zjut.edu.cn)