A Liquid Crystal-Based Fourier Optical Spectrum Analyzer

Lu, Yanqing; Wong, Charles; Wu, Shin‐Tson

doi:10.1109/lpt.2004.823723

Cited by 14 publications

(7 citation statements)

References 8 publications

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“…A liquid crystal (LC) is a good birefringent material because of its large tunable refractive index, low driven voltage, and fast response, all of which have been widely researched in birefringent FTS. [8][9][10][11][12][13][14][15] The primary methods of LC birefringent FTS are based on a Wollaston prism with spatial interference 8-10 and a binary voltage-controlled LC stages with time interference. [11][12][13][14][15] For the spatial interference, the fringes are recorded by a detector array, which may increase the error due to the noise difference of the subdetectors.…”

Section: Introductionmentioning

confidence: 99%

Method of realizing compact Fourier transform spectrometer without moving parts based on birefringent liquid crystal

et al. 2014

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A method of realizing a compact Fourier transform spectrometer is proposed in this work, which is based on the polarization interference in a single layer of birefringent liquid crystal (BLC). The continuous interference between the ordinary light and the extraordinary light is driven by a continuously adjusted electric field. Benefiting from the single-layer configuration with no moving parts, the spectrometer is easily miniaturized. The method to realize the spectrometer is theoretically analyzed and experimentally demonstrated by a layer of nematic BLC with a 100-μm thickness.

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Section: Introductionmentioning

confidence: 99%

Method of realizing compact Fourier transform spectrometer without moving parts based on birefringent liquid crystal

et al. 2014

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“…The infrared applications of LC phase retarders are now attracting more and more research interests because of its promising commercial and military usages. Up to date, many related infrared LC devices have been demonstrated, such as the optical phased arrays, light switches, spatial light modulators, and variable optical attenuators [1][2][3]. As a key component of these applications, the LC phase retarder dominates the performances of a whole system.…”

Section: Introductionmentioning

confidence: 99%

Dual-Frequency Addressed Infrared Liquid Crystal Phase Modulators with Submillisecond Response Time

Nie

Tie-jun

et al. 2006

Molecular Crystals and Liquid Crystals

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Dynamic response of a dual-frequency liquid crystal (DFLC) based near infrared phase modulator is investigated through numerical simulations and experiments. The relationships between the optical response times and various voltage driving conditions are studied. An optical phase retarder operating at 1.55 lm wavelength is demonstrated by using our homemade high figure-of-merit DFLC mixture. To improve the response time, both dual-frequency addressing and high voltage overdrive methods are employed. The obtained optical rising and decay times are reduced to less than 0.5 ms for a 2p phase change. The optical transition curves simulated with finite element method show good agreement with our experimental results.

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“…In general these approaches require expensive high finesse tuneable optical filter components in order to resolve the optical spectrum in appropriate detail. The use of Fourier analysis and tuneable filters to estimate the optical spectrum has also been studied [7]. In this paper, we consider the use of low finesse tuneable optical Fabry-Pérot filters and least-squares based inverse signal processing to achieve low cost high performance optical power spectrum monitoring.…”

Section: Introductionmentioning

confidence: 99%

Signal Processing for Optical Power Spectrum Monitoring

Che

Evans

Tucker

2006

2006 Fortieth Asilomar Conference on Signals, Systems and Computers

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In this paper, we explore the application of signal processing methods to the design of optical monitoring equipment for use in optical networks. In particular, we study inverse signal processing to enhance the performance of optical power spectrum estimation, based on low finesse (low Q) tunable optical filters. We consider both batch and recursive methods. Simulation results confirm that accurate power spectrum estimates can be achieved using the proposed techniques.

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A Liquid Crystal-Based Fourier Optical Spectrum Analyzer

Cited by 14 publications

References 8 publications

Method of realizing compact Fourier transform spectrometer without moving parts based on birefringent liquid crystal

Method of realizing compact Fourier transform spectrometer without moving parts based on birefringent liquid crystal

Dual-Frequency Addressed Infrared Liquid Crystal Phase Modulators with Submillisecond Response Time

Signal Processing for Optical Power Spectrum Monitoring

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