Vector modal solution of evanescent coupler

Dinleyici, Mehmet Salih; Patterson, David B.

doi:10.1109/50.643561

Cited by 22 publications

(24 citation statements)

References 11 publications

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“…Those coefficients match the cladding fields in cylindrical form with the fields of the half-space in Cartesian coordinates. By exploiting this technique and replacing the infinite half-space with a planar slab waveguide, we have developed a mathematical model for the evanescent fiber/slab coupler and have analyzed the behavior of various device geometries in [8]. The relevant geometries and refractive indexes are shown in Fig.…”

Section: Mathematical Modelmentioning

confidence: 99%

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Calculation of the wavelength filter properties of the fiber-slab waveguide structure using vector mode expansion

Dinleyici

Patterson

1998

J. Lightwave Technol.

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Abstract-A vectorial solution technique is applied to investigate the dispersion characteristics of the ridge modes of a waveguide structure comprising a slab and optical fiber. The power transmission characteristics of the device with respect to wavelength are calculated under various device parameters, such as slab index and fiber-slab separation. We discuss the effects of such parameters on the bandwidth and rejection of the notch filter produced by this structure.Index Terms-Optical coupling, optical fiber couplers, optical fiber devices, optical fiber filter, wavelength division multiplexing.

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Section: Mathematical Modelmentioning

confidence: 99%

“…In [8], we describe a vectorial method, introduced by Marcuse for the analysis of D-fiber [9], to investigate dispersion and power transmission characteristics of the device. We have identified the ridge modes of this device by regarding the whole waveguide structure as a single waveguide.…”

Section: Introductionmentioning

confidence: 99%

Calculation of the wavelength filter properties of the fiber-slab waveguide structure using vector mode expansion

Dinleyici

Patterson

1998

J. Lightwave Technol.

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“…Although the se two approache s yie ld similar re sults for the configurations use d in the e xpe rime nts, the se re sults de viate and contradict at some point, such as the w x re sonance point and e xplanation of the de vice ope ration 8,9 . O ne of the se discrepancie s is the de vice le ngth require me nt, which is of m ain inte rest in this pape r. The de vice le ngth require me nt m ay be de fine d as the require d propag ation distance in the fibe r axis such that it will allow the powe r in the fibe r to be e xtracte d e ffe ctive ly as imposed by the de vice ope ration.…”

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Device Length Requirement in Slab Fiber Evanescent Coupler

Dinleyici¹

2000

Fiber and Integrated Optics

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“…The fundamental mode is the one with the largest propagation constant and the only mode that is well confined in the vicinity of the microfiber. 25,26 Generally, n eff increases as the analyte refractive index ͑n a ͒ increases, and increases more sharply for smaller d because in this case a larger fraction of the mode is propagating in the analyte. In the OMCRS we fabricated d ϳ 0.…”

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confidence: 99%

“…Because of the interface with the analyte, the mode propagating in the coated microfiber experiences a refractive index surrounding similar to that of a conventional D-shaped fiber. 25,26 The mode properties are particularly affected by two parameters: the microfiber radius r and the coating thickness d between the microfiber and the fluidic channel. We evaluated the effective index n eff of the fundamental mode propagating in the optical microfiber by a finite element method with the commercial software COMSOL3.3.…”

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Demonstration of a refractometric sensor based on optical microfiber coil resonator

Xu¹,

Brambilla²

2008

Applied Physics Letters

163

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We experimentally demonstrated a refractometric sensor based on a coated optical microfiber coil resonator. It is robust, compact, and comprises an intrinsic fluidic channel. A sensitivity of about 40 nm/RIU ͑refractive index unit͒ has been measured, in agreement with predictions. © 2008 American Institute of Physics. ͓DOI: 10.1063/1.2898211͔ Evanescent-field-based optical resonators in the form of microspheres, photonic crystals, microdisks, microtoroids, and microrings have been under intensive investigation for deployment as biological and/or chemical sensors. [1][2][3][4][5][6][7][8][9] Resonating structures can provide a simple, inexpensive, highthroughput technology for label-free real-time measurements and are attracting increasing interest. Subwavelengthdiameter optical microfibers are ideal sensor elements because of their low cost, low loss, and very large evanescent fields. [10][11][12][13] Microfiber resonators, in the form of loop and multicoils, have the advantage of a launching/collection efficiency close to unity thanks to their extremities fiber pigtails. Thus, microfiber resonators do not suffer the onerous input/ output coupling problems experienced by other high-Q ͑quality factor͒ resonators. The remaining dominating problem, associated with devices based on microfiber resonators, is the temporal degradation of their optical and mechanical properties when manufactured in air. 13 This issue was resolved by embedding the devices and this has led to the proposal to develop several high sensitivity sensors 14,15 based on microfiber coil resonators. [16][17][18] Although they are protected by a layer of coating, they still have a large evanescent field. Three-dimensional ͑3D͒ microfiber microcoil resonators have been experimentally demonstrated by wrapping microfibers on a rod 19 and coating them with Teflon 20 or immersing them in a low refractive index liquid. 21 The optical microfiber coil refractometric sensor ͑OMCRS͒ has been obtained from an embedded 3D microfiber microcoil resonator by removing its supporting rod. The proposed OMCRS has a microfluidic channel for the analyte delivery and has small size, high sensitivity, high selectivity, and low detection limits. It is also strong and portable because it is coated and embedded in a polymeric host.In this letter, we experimentally demonstrate an OMCRS based on a Teflon-coated 3D microfiber coil resonator.The OMCRS was fabricated as follows. First, a microfiber was fabricated with the so-called modified flamebrushing technology using the setup presented in Ref. 22 with a microheater ͑NTT-AT, Japan͒. The length and diameter of the uniform waist region of the fabricated microfiber were 50 mm and ϳ2.5 m, respectively. The microfiber was then wrapped on a 1 mm diameter polymethylmethacrylate ͑PMMA͒ rod. PMMA is a polymer with an amorphous structure which is soluble in acetone, has a density of 1.19 g / cm 3 , very low water absorption, and a refractive index in the range of 1.49-1.51. The whole structure was repeatedly coated by the Teflon solut...

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Vector modal solution of evanescent coupler

Cited by 22 publications

References 11 publications

Calculation of the wavelength filter properties of the fiber-slab waveguide structure using vector mode expansion

Calculation of the wavelength filter properties of the fiber-slab waveguide structure using vector mode expansion

Device Length Requirement in Slab Fiber Evanescent Coupler

Demonstration of a refractometric sensor based on optical microfiber coil resonator

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