Single-Mode Fibers

Neumann, Ernst-Georg

doi:10.1007/978-3-540-48173-7

Cited by 197 publications

(71 citation statements)

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“…β is the propagation constant of the mode. Splice loss (α) of the fiber has been calculated using the formula given below [27]:…”

Section: Theorymentioning

confidence: 99%

Segmented-Core Single Mode Optical Fiber With Ultra-Large-Effective-Area, Low Dispersion Slope and Flattened Dispersion for DWDM Optical Communication Systems

Hooda¹,

Rastogi²

2013

PIER B

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Abstract-In this paper we present designs of fibers having non-zero positive, non-zero negative and near-zero ultra-flattened dispersion with small dispersion slope and ultra-large effective area over a wide spectral range. The designs consist of a concentric multilayer segmented core followed by a trench assisted cladding and a thin secondary core. The central segmented core helps in maintaining desired dispersion over a wide range of wavelength. The second core of the fiber helps in achieving ultra-large effective area and trench assisted cladding reduces the bending loss. The designs of the fiber have been analyzed by using the transfer matrix method. For positive non-zero dispersion flattened fiber we have optimized dispersion near +4.5 ps/km/nm in the wavelength range 1.46-1.65 µm. Maximum value of dispersion slope of the fiber in above mentioned wavelength range is 0.026 ps/km/nm 2 . In the design of negative non-zero dispersion flattened fiber, dispersion has been achieved near −6 ps/km/nm in the spectral range of 1.33-1.56 µm and maximum value of dispersion slope is 0.048 ps/km/nm 2 . Dispersion and dispersion slope of near zero dispersion flattened fiber lie in the range [0.0039-0.520] ps/km/nm and [(0.0004)-(0.0365)] ps/km/nm 2 respectively in the spectral range of 1.460-1.625 µm. The near zero dispersion flattened fiber has an ultra-high effective area ranging from 114 µm 2 to 325.95 µm 2 in the aforementioned wavelength range, which covers the entire S+C+L-band. These values of mode area are noticeably higher than those reported in literature for flattened dispersion fibers with large mode area. Designed fiber shows very small bending loss. We report breakthrough in the mode area of the single mode optical fiber with ultra flattened dispersion and low dispersion slope.

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“…β is the propagation constant of the mode. Splice loss (α) of the fiber has been calculated using the formula given below [27]:…”

Section: Theorymentioning

confidence: 99%

Segmented-Core Single Mode Optical Fiber With Ultra-Large-Effective-Area, Low Dispersion Slope and Flattened Dispersion for DWDM Optical Communication Systems

Hooda¹,

Rastogi²

2013

PIER B

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“…α(ω) is the linear losses of the FDF. For the linear losses of the fiber, we take a fairly standard model of the spectral attenuation of the fiber [23] and we fit the parameters to get an attenuation curve that matches our measurements in the relevant points (OH peak at 1390 nm and losses at 1650 nm).. Dispersion effects are described by the first term on the right hand side of Eq. (2) while nonlinear optical effects such as Self-Phase Modulation, SRS, self-steepening and shock-wave formation correspond to the second one.…”

Section: Numerical Simulationsmentioning

confidence: 99%

Spectrally-bounded continuous-wave supercontinuum generation in a fiber with two zero-dispersion wavelengths

et al. 2008

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A common issue in fiber-based supercontinuum (SC) generation under\ud continuous-wave pumping is that the spectral width of the resulting source is related\ud to the input power of the pump laser used. An increase of the input pump power\ud leads to an increase of the spectral width obtained at the fiber output, and therefore,\ud the average power spectral density (APSD) over the SC spectrum does not grow\ud according to the input power. For some applications it would be desired to have a\ud fixed spectral width in the SC and to increase the average PSD proportionally to the\ud input pump power. In this paper we demonstrate experimentally that SC generation\ud under continuous-wave (CW) pumping can be spectrally bounded by using a fiber\ud with two zero-dispersion wavelengths (ZDWs). Beyond a certain pump power, the\ud spectral width of the SC source remains fixed, and the APSD of the SC grows with\ud the pump power. In our experiment we generate a reasonably flat, spectrally-bounded\ud SC spanning from 1550 nm to 1700 nm. The spectral width of the source is shown to\ud be constant between 3 and 6 W of pump power. Over this range, the increase in input\ud power is directly translated in an increase in the output APSD. The experimental\ud results are confirmed by numerical simulations, which also highlight the sensitivity\ud of this configuration to variations in the fiber dispersion curve. We believe that these\ud results open the way for tailoring the spectral width of high-APSD CW SC by\ud adjusting the fiber dispersion.Ministerio de Educación y CienciaComunidad de MadridConsejo Superior de Investigaciones CientíficasConseil Régional du Nord Pas de Calai

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“…LMA fibers are a type of photonic crystal fiber whereby optical energy is trapped and guided by a crystal structure [1], see Fig.1, rather than the step reduction in refractive index between core and cladding of a traditional step index fiber [2]. See Refs.…”

Section: Large Mode Area (Lma) Photonic Crystal Fibermentioning

confidence: 99%

“…Both step index and LMA fibers suffer from an upper bendloss edge in their attenuation spectra associated with the radiation of the tail of the transverse modal field on the outside of a bend of some radius as at some distance from the fiber axis its local velocity vector exceeds the local speed of light [2]. However, the reducing difference between the bulk refractive index of the cladding with respect to the core of the LMA fiber [3], which accounts for most this fibers interesting properties, also leads to a lower bendloss edge.…”

Section: Single-mode Fibers In Interferometrymentioning

confidence: 99%

“…Full derivations of this equation are given for smoothly varying or step index fibers in references [2] and [8]. While a complete analysis of the validity of this formula for LMA type fibers is beyond the scope of this paper, this approach can be applied to commercially available LMA fibers which have many rings of holes in their cross sectional structure surrounding the central defect and thus have well bound guided modes.…”

Section: Coupling Modelmentioning

confidence: 99%

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Coupling starlight into single-mode photonic crystal fiber using a field lens

Corbett¹,

Allington‐Smith²

2005

Opt. Express

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Abstract:We determine the coupling characteristics of a large mode area (LMA) photonic crystal, single-mode fiber when fed with an on-axis field lens used to place an image of the telescope exit pupil at the fiber input. The maximum field of view is found to be approximately the same as that of feeding the fiber directly with the telescope PSF in the image plane. However, the field lens feed can be used to provide a flat, maximised coupling response over the entire visible-NIR which is not possible using either the highly wavelength dependent direct feed coupling to the LMA fiber or the attenuation spectrum limited step index fiber cases.

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Single-Mode Fibers

Cited by 197 publications

References 0 publications

Segmented-Core Single Mode Optical Fiber With Ultra-Large-Effective-Area, Low Dispersion Slope and Flattened Dispersion for DWDM Optical Communication Systems

Segmented-Core Single Mode Optical Fiber With Ultra-Large-Effective-Area, Low Dispersion Slope and Flattened Dispersion for DWDM Optical Communication Systems

Spectrally-bounded continuous-wave supercontinuum generation in a fiber with two zero-dispersion wavelengths

Coupling starlight into single-mode photonic crystal fiber using a field lens

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