Tunable filter with a complex coefficient based on polarization controller

Zhihu Wei; Rong Wang; Tao Pu; Tao Fang; Guodan Sun; Jilin Zheng

doi:10.1117/1.OE.52.4.044002

3 April 2013 Tunable filter with a complex coefficient based on polarization controller

Zhihu Wei, Rong Wang, Tao Pu, Tao Fang, Guodan Sun, Jilin Zheng

Author Affiliations +

Optical Engineering, Vol. 52, Issue 4, 044002 (April 2013). https://doi.org/10.1117/1.OE.52.4.044002

Abstract

A wideband tunable filter with a complex coefficient is proposed and demonstrated. The output of a polarization modulator is filtered by the optical bandpass filter, an optical single sideband modulation will be generated. When it passes through a polarization controller and a polarizer, a complex coefficient will be achieved by tuning the angle of the polarization controller before the polarizer, and the real coefficients are controlled by the optical power of the lasers. As the real coefficients and complex coefficient can be tuned, a two-taps incoherent photonic microwave filter with a tunable range over the entire full free spectral range is realized by adjusting the polarization angle from −90 deg to 90 deg while the shape of filter remains unchanged.

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Zhihu Wei, Rong Wang, Tao Pu, Tao Fang, Guodan Sun, and Jilin Zheng "Tunable filter with a complex coefficient based on polarization controller," Optical Engineering 52(4), 044002 (3 April 2013). https://doi.org/10.1117/1.OE.52.4.044002

Published: 3 April 2013

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KEYWORDS

Polarization

Tunable filters

Modulators

Optical filters

Microwave photonic filters

Phase shifts

Microwave radiation

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