Narrow-band spectral filter made of W-index and step-index fibers

Chung, C. J.; Safaai‐Jazi, A.

doi:10.1109/50.108734

Cited by 16 publications

(7 citation statements)

References 11 publications

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“…At the wavelength characterized by intersection points a complete power exchange between the coupled systems is possible, whereas away from this wavelength the power transfer decreases to very small values resulting in a highly wavelength selective coupling device. The degree of the wavelength selectivity depends on the difference regarding the slopes of the dispersion curves at the intersection points (Chung and Safaai-Jazi 1992). In general, dissimilar systems are much more wavelength selective than similar systems.…”

Section: Core To Ring Coupling Inside a Multi-layer Fibermentioning

confidence: 99%

Rigorous mode solver for multilayer cylindrical waveguide structures using constraints optimization

et al. 2009

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A rigorous mode solver for multilayer fiber configurations using a Constraint Optimization method is presented. For an arbitrary number of dielectric or metallic layers the cylindrical wave equations are solved exactly. The transition between the different layers implies a coupling of all field components. Case examples of three unconventional fiber structures (Air-ARROW-fiber, metal-coated fiber, core to ring fiber coupler) are presented. Mode dispersions charts and field characteristics are calculated to demonstrate the performance of the constraints optimization method applied.

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Section: Core To Ring Coupling Inside a Multi-layer Fibermentioning

confidence: 99%

Rigorous mode solver for multilayer cylindrical waveguide structures using constraints optimization

et al. 2009

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“…Most of the dissimilar couplers consist of two single-clad fibers with different core radii and core index distributions [9,10]. Recently, a narrow-band spectral filter made of W-index and step-index fibers offered a spectral width on the order of several nanometers, considerably narrower than that provided by a filter made of two single-clad fibers [11]. However, its performance is suffered from the high sidelobe levels, so it requires large interchannel wavelength spacing to avoid crosstalk.…”

Section: Introductionmentioning

confidence: 99%

“…Several methods have been proposed for multiplexing and demultiplexing optical signals in different wavelengths [1][2][3][4][5][6][7][8][9][10][11]. Among them the all-fiber spectral filter is especially promising because of its low insertion and transmission loss.…”

Section: Introductionmentioning

confidence: 99%

“…Among them the all-fiber spectral filter is especially promising because of its low insertion and transmission loss. Wavelength selective coupler can be made of two identical or dissimilar fibers [3][4][5][6][7][8][9][10][11]. The bandwidth of two identical fibers coupler is generally very large, thus it requires long coupling length to form a narrow-band filter.…”

Section: Introductionmentioning

confidence: 99%

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Narrow-band an Low Sidelobes Spectral Filter with Weighted Coupling

Chao¹,

Wu²

1995

Journal of Optical Communications

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The paper discusses the narrow-band and low sidelobes spectral filter achievable with directional coupler constructed with a W-index and a step-index fibers. By properly weighting the coupling strength along the device, the sidelobe levels can be reduced significantly. With a Gaussian function weighting, -39.6 dB transfer response sidelobes have been obtained, more than 30 dB reduction over the uniform coupling case. Besides, the implict relations between the coupling length and the required bending radius can be found.

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“…1 These studies have resulted in filters that employ absorption, 2-7 dispersion, 7-11 selective reflection, [12][13][14][15] or spectrally selective transmission. 1,[16][17][18][19][20][21][22] Based on these general concepts, a variety of techniques are currently available for spectral image filtering. 1,23 These include, among others, dichroic coated filters, [24][25][26][27] holographic filters, [28][29][30][31][32][33][34][35] acousto-optic tunable filters, 35 Fabry-Perot tunable filters, 24,[35][36][37][38][39] tunable birefringent filters, 23,[40][41][42][43][44][45][46] and Lyot filters.…”

Section: Introductionmentioning

confidence: 99%

Novel continuously tunable high spectral resolution optical filter for two-dimensional imaging

Mukherjee

Chen

Witanachchi

2001

Review of Scientific Instruments

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Despite the existence of a variety of optical filters for the separation of spectral components in a multicolor image, a filter that is both continuously wavelength tunable and capable of high spectral resolution while preserving the spatial integrity of a two-dimensional image is not currently available. We present, in this article, the introduction of a novel optical filtering concept that permits the development of such a system. Both the concept and its implementation in an optical-fiber-based prototype that converts two-dimensional images to a one-dimensional array followed by interconversion for image reconstruction are presented. The performance of the prototype is analyzed using both a xenon arc lamp as a standard broadband illumination source as well as He–Ne and Ar lasers as sources of coherent radiation. An unoptimized throughput efficiency of approximately 30% and a bandwidth of 6 Å without spectral leakage or spatial crosstalk is obtained over the entire investigated tuning range from 430 to 807 nm. Potential applications of such an optical filtration system, with wavelength tunability on the angstrom scale and potential spatial resolutions in the micrometer range, using suitable optical imaging are discussed.

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Narrow-band spectral filter made of W-index and step-index fibers

Cited by 16 publications

References 11 publications

Rigorous mode solver for multilayer cylindrical waveguide structures using constraints optimization

Rigorous mode solver for multilayer cylindrical waveguide structures using constraints optimization

Narrow-band an Low Sidelobes Spectral Filter with Weighted Coupling

Novel continuously tunable high spectral resolution optical filter for two-dimensional imaging

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