Calculators for optical fiber propagation, coupling, and losses.
47 calculators
Estimate Gaussian-beam-to-single-mode-fiber coupling efficiency from beam NA, mode field diameter, lateral offset and tilt.
Compare the macrobend loss of standard single-mode fibre with a reduced-MFD step-index design and check the design against the ITU-T G.657 limits.
Geometric (elliptical-core) and stress-induced birefringence and beat length of a single-mode fiber from core and cladding indices and core shape.
Calculate chromatic dispersion, pulse broadening, and system penalties for single-mode fiber.
Calculate single-mode connector insertion loss from offset, tilt and gap, and build link budgets from IEC 61753-1 grades.
Calculate the return loss of a flat or angle-polished fiber end face from the index step, and compare with IEC 61753-1 grades.
Coupled-mode power transfer between two waveguides: coupled and through power, maximum transfer κ²/ψ² and the length that reaches it, power along the coupler and the response to the mismatch Δβ.
Evanescent power at the flat, external-index shift of the effective index and refractometric sensitivity of a D-shaped single-mode fiber.
Calculates chromatic dispersion limits and DCF (dispersion-compensating fiber) requirements.
Design a dispersion map for a fiber link using SMF and DCF segments.
Compare DSF, NZ-DSF, and DCF dispersion characteristics.
EDFA, YDFA, TDFA and HDFA signal gain, output power, residual pump and noise figure from pump power, fiber length, doping and cross-sections, with gain against pump and length.
Calculate bandwidth limitations from chromatic dispersion, modal dispersion, and PMD.
Calculate the reflection spectrum, peak reflectance, FWHM and first-zero bandwidth of uniform, Gaussian-apodized and linearly chirped fiber Bragg gratings.
Calculate FBG wavelength shift for strain and temperature sensing applications.
Calculate bundle diameter, cladding and core fill, packing-fraction loss and étendue for hexagonal or square fiber bundles.
Step-index fiber parameters from the core and cladding indices and core radius: V, cutoff, MFD, effective area and index, nonlinear γ, core confinement and datasheet dispersion.
Calculate power splitting, transfer curves, and spectral response for directional fiber couplers.
Calculate group delay, dispersive pulse spread, thermal delay drift and loop FSR for fiber optic delay lines.
Fiber laser output power, optical and Stokes efficiency, efficiency beyond the quantum defect, the Rigrod optimum output coupling from gain and cavity loss, and the signal core's V number, mode count and mode-field diameter.
Calculate total optical link loss, received power, and link margin for fiber optic systems.
Sagnac fiber loop mirror reflectance and transmission versus coupling ratio and loss, and the comb filter made by a polarization-maintaining section.
Sagnac scale factor, shot-noise angle random walk, Earth-rate phase, transit time and proper frequency of an interferometric fiber optic gyroscope.
Calculate the strain and temperature response of FBG and Mach-Zehnder fiber sensors, the fringes of an air-gap Fabry-Pérot cavity, and the evanescent penetration depth.
Retardance per paddle from bend-induced birefringence, quarter- and half-wave loop diameters and the output polarization state of a three-paddle fiber polarization controller.
Combined pump power, étendue budget, tapered-bundle diameter and pump NA after the taper for an N×1 or (N+1)×1 fiber pump combiner.
Estimate single-mode splice loss from lateral offset, tilt, end-face gap and mode-field-diameter mismatch with the Gaussian mode model.
Heat-and-pull fiber taper: Birks–Li waist diameter and profile, core–cladding transition, waist mode and evanescent field, and Love's adiabaticity criterion.
Normalized frequency V = 2πa·NA/λ of a step-index fiber, NA from core and cladding indices, the single-mode check (V < 2.405) and the exact guided-mode count.
Compare low-water-peak (G.652.D) and older single-mode fiber: loss at the 1383 nm OH peak, OH content, E-band average, the span loss of each CWDM channel, and the OH absorption bands of silica at 943, 1383 and 2722 nm.
Detailed macrobending loss calculation using the curvature radiation model for single-mode fiber.
Microbending loss of a single-mode fiber with a sinusoidal axis deformation, and the critical period beyond which it vanishes.
Mode-field diameter (Petermann II and Gaussian fit), effective area, V, b and core confinement of a step-index single-mode fiber, with its bend loss.
Inter-core coupling coefficient, bend-averaged power coupling and crosstalk of a multi-core fiber versus core pitch, bend radius, core mismatch and length.
Design NZ-DSF fibers (G.655) with optimized dispersion for DWDM systems — balancing dispersion and nonlinearity.
Calculate the nonlinear coefficient γ, SPM and XPM phase, four-wave-mixing efficiency and SBS/SRS thresholds of a fiber span.
Model an OTDR on single-mode fiber: two-point resolution, Rayleigh backscatter coefficient, one-way dynamic range versus pulse width and averaging, cumulative splice steps and Fresnel peaks.
Effective V-number, single-mode cutoff, effective index, mode-field diameter and chromatic dispersion of a solid-core photonic crystal fiber from hole pitch Λ and diameter d (Saitoh–Koshiba relations).
Calculate PMD-induced differential group delay (DGD), its Maxwellian outage probability, and PMD-limited reach.
Birefringence, beat length, h-parameter and output extinction ratio of PANDA, bow-tie and elliptical-core PM fibers versus length and input PER.
Ion density from wt-ppm, LP01 overlap, pump and signal absorption, 90 % absorption length, saturation power, gain and noise figure of an Er-, Yb-, Tm- or Ho-doped fiber.
Calculate Stimulated Brillouin Scattering threshold for optical fibers.
Evanescent power beyond the polished face, overlay index shift and polished-coupler transfer of a side-polished single-mode fiber.
Compare data-sheet properties of specialty optical fibers (PM, erbium-, ytterbium- and thulium-doped, ZBLAN, chalcogenide): V-number, cutoff, mode-field diameter and loss.
Calculate Stimulated Raman Scattering threshold for optical fibers.
Spectral attenuation of silica single-mode fiber: Rayleigh scattering, infrared and ultraviolet absorption tails and the 1383 nm water peak, with the minimum-loss wavelength and span loss.
WDM channel wavelengths, frequency spacing, ITU-T grid type (CWDM or DWDM), total bandwidth, insertion loss and Gaussian-passband isolation from channel count and spacing.