Bandwidth tuning of hybrid liquid-crystal Šolc filters based on an optical cancelling technique

Hamdi, Rachid; Benkelfat, Badr-Eddine; Zou, Qin; Gottesman, Yaneck

doi:10.1016/j.optcom.2006.07.059

Cited by 9 publications

(2 citation statements)

References 12 publications

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“…Liquid-crystal cells (LCC) have attracted considerable attention for realizing electrically controllable devices [1][2][3][4][5][6][7]. In optical communication networks, they are mainly used to tune the wavelength and transmission bandwidth of hybrid liquidcrystal birefringent filters.…”

Section: Introductionmentioning

confidence: 99%

Tuning of liquid-crystal birefringence using a square ac variable frequency voltage

Hamdi

Bendimerad

Benkelfat

et al. 2015

J. Opt.

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We demonstrate that the birefringence of the liquid-crystal cell (LCC) can be varied by applying different frequency values of a single applied ac square voltage. For the experimental evaluation of the birefringence, associated with a certain wavelength λ, as a function of the frequency FLCC of the electrical signal applied to the LCC, we use, for the first time to our knowledge, what we call here a frequency-dependent transmission technique. It consists in measuring the transmission responses between crossed and parallel polarizers as a function of the frequency FLCC. Experimental tests were carried out using a 7 μm-thick E63 nematic LCC and a laser source emitting at λ = 1.55 μm with a launch power of −3 dBm. The tuning voltage VLCC applied to the LCC is an alternative square wave electrical signal whose frequency ranges from 0.5 to 15 kHz. The peak to peak amplitude of the electrical signal is 5 V. The curve of the measured variations of the optical path difference of the LCC versus the frequency FLCC has a positive slope. Application to the tuning of the center wavelength of the transmission response of a one stage hybrid birefringent filter is shown as a proof-of-principle test.

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Section: Introductionmentioning

confidence: 99%

Tuning of liquid-crystal birefringence using a square ac variable frequency voltage

Hamdi

Bendimerad

Benkelfat

et al. 2015

J. Opt.

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“…Bailey et al [10] reported an electrical tuning of negative dielectric anisotropy CLC under the influence of ac and dc electric fields. Hamdi et al [17] demonstrated that in addition to tuning the wavelength, an N-stage hybrid liquid crystal Solc filter with LC cells can also be used to vary the transmission bandwidth.…”

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confidence: 99%

Tunable Optical Filters Based on Different Configurations with Cholesteric Liquid Crystals

Chen

Yin

Liu

et al. 2015

Chinese Phys. Lett.

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Optical filters with different configurations based on cholesteric liquid crystals (CLCs) are designed. The central wavelength from CLCs can be tuned by the electric field or temperature. For the electric field tuning, the ITO is designed with circular patterns, which can make the tunable range 18 nm. For the temperature tuning, two-layer-CLC configurations are used. The experimental results indicate that a deepened or broadened bandgap from the CLC can be achieved by different handedness or concentrations of chiral dopants. The spectrum study is carried out.

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A design of a tunable hybrid Solc filter for 40-Gbps DWDM optical systems

Slimane

Karim

2017

Photon Netw Commun

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Bandwidth tuning of hybrid liquid-crystal Šolc filters based on an optical cancelling technique

Cited by 9 publications

References 12 publications

Tuning of liquid-crystal birefringence using a square ac variable frequency voltage

Tuning of liquid-crystal birefringence using a square ac variable frequency voltage

Tunable Optical Filters Based on Different Configurations with Cholesteric Liquid Crystals

A design of a tunable hybrid Solc filter for 40-Gbps DWDM optical systems

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