Tunable broadband filter based on lithium-niobate asymmetric Mach–Zehnder interferometer for coarse wavelength-division multiplexing applications

Ming Li; Xuepeng Li; Junhui Li; Kaixin Chen

doi:10.1117/1.OE.58.3.037101

12 March 2019 Tunable broadband filter based on lithium-niobate asymmetric Mach–Zehnder interferometer for coarse wavelength-division multiplexing applications

Ming Li, Xuepeng Li, Junhui Li, Kaixin Chen

Author Affiliations +

Optical Engineering, Vol. 58, Issue 3, 037101 (March 2019). https://doi.org/10.1117/1.OE.58.3.037101

Abstract

Channel-select filtering technology is a very promising solution for realizing reconfigurable demultiplexing components required in a flexible coarse wavelength-division multiplexing system. Here, we propose and demonstrate an electro-optic tunable broadband filter based on an asymmetric Mach–Zehnder interferometer formed on lithium niobate for this application. The counter-tapered directional coupler is introduced to replace the conventional one formed with uniform waveguides so that a splitting ratio of 50%:50% is much easier to be realized over a wide wavelength range and, hence, increase bandwidth of the filter. In addition, to reduce the bending loss in the long-wavelength region, the waveguide width and the height of the involved S-bend waveguides are optimized experimentally. Our fabricated filter, which has a total length of ∼30 mm, exhibits an extinction ratio of ∼15 dB and a wide tuning range of >40 nm with an electrical wavelength tuning sensitivity of ∼4.5 nm / V.

Citation Download Citation

Ming Li, Xuepeng Li, Junhui Li, and Kaixin Chen "Tunable broadband filter based on lithium-niobate asymmetric Mach–Zehnder interferometer for coarse wavelength-division multiplexing applications," Optical Engineering 58(3), 037101 (12 March 2019). https://doi.org/10.1117/1.OE.58.3.037101

Received: 21 December 2018; Accepted: 20 February 2019; Published: 12 March 2019

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KEYWORDS

Waveguides

Tunable filters

Coarse wavelength division multiplexing

Interferometers

Lithium

Electrodes

Optical filters

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