Laser & Optoelectronics Progress, Volume. 52, Issue 7, 72301(2015)
Design of Electrically Controlled Double Wavelength Orthogonal Polarization Tunable Filter
An electrically controlled double wavelength tunable filter based on lithium niobate (LN) is designed. Double wavelength of orthogonal polarization filter is achieved by etching Bragg grating on the Ti-diffusion LN waveguide, which supports transverse electric (TE) mode and transverse magnetic (TM) mode. The refractive index distribution and therefore the Bragg wavelength can be fast tuned by using electro-optic effect in LN. The performance of waveguide grating filter is analyzed and results show that the grating with 1/2 etching duty cycle and less than 15°etching angle has the best filter characteristic. The reflectivity and bandwidth increase with the etching depth increasing. Double wavelength filter achieves 15.6 pm/V sensitivity for TE mode, 5.5 pm/V sensitivity for TM mode by adding the transverse electric field on waveguide grating.
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Zhang Ailing, He Peidong, Pan Honggang, Yan Guangtuo, Sun Qinfang. Design of Electrically Controlled Double Wavelength Orthogonal Polarization Tunable Filter[J]. Laser & Optoelectronics Progress, 2015, 52(7): 72301
Category: Optical Devices
Received: Jan. 23, 2015
Accepted: --
Published Online: Apr. 28, 2015
The Author Email: Ailing Zhang (alzhang07@163.com)