LED bandwidth of multimode fibers as a function of laser bandwidth and LED spectral characteristics

Refi, James J.

doi:10.1109/jlt.1986.1074714

Cited by 15 publications

(5 citation statements)

References 6 publications

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“…A spatially and spectrally wide launch generated by a light-emitting diode (LED) has applications in legacy networks as well as in measurement instruments (Refi 1986), and optimum coupling may be achieved with a lens (Hasegawa et al 1978;Park et al 1999). We assume that such an overfilled launch is spatio-temporally incoherent and that the spatial interference of the 342 modal electromagnetic fields lead to speckle patterns that blend to a cylindrically symmetrical intensity pattern due to the large spectral width of the LED source.…”

Section: Overfilled Launchmentioning

confidence: 99%

Electromagnetic mode matching in a Wilson basis: optical fiber connections with a gap

et al. 2022

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On the basis of two optical fibers with an optional lateral and longitudinal displacement in a homogeneous background medium, we describe a general full-vectorial Wilson-basis discretized mode-matching method that evaluates the converged electromagnetic fields after all resonances in the possible gap cavity have settled. Wilson basis functions feature strong localization in both the spatial and the spectral domain, which allows for efficient modal electromagnetic field expansions, adequate truncation of field propagation operators, and sparse translation operators, which in turn allow to make ad hoc electromagnetic fieldmatching operators. For physical contact connections between single-mode fibers with a mode-field diameter mismatch, we obtain attenuation curves that are right between those obtained from approximation methods that either effectively match the electric field or the magnetic field under the assumption of a vanishing reflection. For fibers separated by a growing gap, constructive and destructive interference patterns in the cavity are computed by the successive application of Love's equivalence principle and the propagation operator. By leveraging the physical width of the Wilson basis functions and the stepsize of the propagation operator, the initial operators may be reused in solving the interface problem for other wavelengths. For multi-mode fiber connections, we provide attenuation curves on a modal electromagnetic field level, as well as for overfilled and core-confined target encircled-flux compliant launches. A comparison to geometrical-optics based approaches shows attenuation differences in the order of several hundredth of a dB, and although that is small, it is significant for modern connection attenuation specifications. In the final example of connections between regular and trench-assisted multi-mode fibers, we notice that the relative change in the cumulative near-field power distribution can be significant, despite a marginally small attenuation. The influence of a core diameter and/or numerical aperture mismatch can be examined with a deliberate lateral misalignment.

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Section: Overfilled Launchmentioning

confidence: 99%

Electromagnetic mode matching in a Wilson basis: optical fiber connections with a gap

et al. 2022

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“…A spatially and spectrally wide launch generated by a light-emitting diode (LED) has applications in legacy networks as well as in measurement instruments [31], and optimum coupling may be achieved with a lens [16,30]. We assume that such an overfilled launch is spatio-temporally incoherent and that the spatial interference of the 342 modal electromagnetic fields lead to speckle patterns that blend to a cylindrically symmetrical intensity pattern due to the large spectral width of the LED source.…”

Section: Overfilled Launchmentioning

confidence: 99%

Electromagnetic Mode Matching in a Wilson Basis --- Optical Fiber Connections with a Gap

Floris

Hon

Beurden

et al. 2021

Preprint

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On the basis of two optical fibers with an optional lateral and longitudinal displacement in a homogeneous background medium, we describe a general full-vectorial Wilson-basis discretized mode-matching method that evaluates the converged electromagnetic fields after all resonances in the possible gap cavity have settled. Wilson basis functions feature strong localization in both the spatial and the spectral domain, which allows for efficient modal electromagnetic field expansions, adequate truncation of field propagation operators, and sparse translation operators, which in turn allow to make ad hoc electromagnetic field-matching operators. For physical contact connections between single-mode fibers with a mode-field diameter mismatch, we obtain attenuation curves that are right between those obtained from approximation methods that either effectively match the electric field or the magnetic field under the assumption of a vanishing reflection. For fibers separated by a growing gap, constructive and destructive interference patterns in the cavity are computed by the successive application of Love's equivalence principle and the propagation operator. By leveraging the physical width of the Wilson basis functions and the stepsize of the propagation operator, the initial operators may be reused in solving the interface problem for other wavelengths. For multi-mode fiber connections, we provide attenuation curves on a modal electromagnetic field level, as well as for overfilled and core-confined target encircled-flux compliant launches. A comparison to geometrical-optics based approaches shows attenuation differences in the order of several hundredth of a dB, and although that is small, it is significant for modern connection attenuation specifications. In the final example of connections between regular and trench-assisted multi-mode fibers, we notice that the relative change in the cumulative near-field power distribution can be significant, despite a marginally small attenuation. The influence of a core diameter and/or numerical aperture mismatch can be examined with a deliberate lateral misalignment.

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“…the early experiments in [14] which demonstrated communication rates of 2Gbps and estimated a useful LED lifetime of over ten years. Refi [15] discusses uses of LEDs in fixed optical networks. Komine [16] discusses use of modulated white LEDs for illumination and indoor communications at rates of 1Gbps or better.…”

Section: Leds For Communicationmentioning

confidence: 99%

Using Light-Emitting Diodes for intersatellite links

Wood¹,

Ivancic

Dorpelkus³

2010

2010 IEEE Aerospace Conference

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LED bandwidth of multimode fibers as a function of laser bandwidth and LED spectral characteristics

Cited by 15 publications

References 6 publications

Electromagnetic mode matching in a Wilson basis: optical fiber connections with a gap

Electromagnetic mode matching in a Wilson basis: optical fiber connections with a gap

Electromagnetic Mode Matching in a Wilson Basis --- Optical Fiber Connections with a Gap

Using Light-Emitting Diodes for intersatellite links

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