Light Localization and Principal Mode Propagation in Optical Fibers

Nolan, Daniel A.; Nguyen, Dan T.

doi:10.3389/fphy.2021.713085

Cited by 7 publications

(3 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The number of principal modes is equal to the number of supported LP modes (LP lm(a,b) ) and lantern single-mode outputs. Principal mode propagation in a multimode fiber is the localization of a group of guided modes at the output in both the frequency and time domains (Nolan & Nguyen 2021). Based on the physical properties of the PL mode converter, the principal modes of the lantern do not suffer from spatiotemporal scattering along the short lantern transition and form orthogonal bases at both the input and the output ends of the waveguide.…”

Section: Lantern Principal Modes As Effective Aperturesmentioning

confidence: 99%

Coherent Imaging with Photonic Lanterns

Kim,

Fitzgerald,

Lin

et al. 2024

ApJ

View full text Add to dashboard Cite

Photonic lanterns (PLs) are tapered waveguides that gradually transition from a multimode fiber geometry to a bundle of single-mode fibers (SMFs). They can efficiently couple multimode telescope light into a multimode fiber entrance at the focal plane and convert it into multiple single-mode beams. Thus, each SMF samples its unique mode (lantern principal mode) of the telescope light in the pupil, analogous to subapertures in aperture masking interferometry (AMI). Coherent imaging with PLs can be enabled by the interference of SMF outputs and applying phase modulation, which can be achieved using a photonic chip beam combiner at the backend (e.g., the ABCD beam combiner). In this study, we investigate the potential of coherent imaging by the interference of SMF outputs of a PL with a single telescope. We demonstrate that the visibilities that can be measured from a PL are mutual intensities incident on the pupil weighted by the cross correlation of a pair of lantern modes. From numerically simulated lantern principal modes of a 6-port PL, we find that interferometric observables using a PL behave similarly to separated-aperture visibilities for simple models on small angular scales (<λ/D) but with greater sensitivity to symmetries and capability to break phase angle degeneracies. Furthermore, we present simulated observations with wave front errors (WFEs) and compare them to AMI. Despite the redundancy caused by extended lantern principal modes, spatial filtering offers stability to WFEs. Our simulated observations suggest that PLs may offer significant benefits in the photon-noise-limited regime and in resolving small angular scales at the low-contrast regime.

show abstract

Section: Lantern Principal Modes As Effective Aperturesmentioning

confidence: 99%

Coherent Imaging with Photonic Lanterns

Kim,

Fitzgerald,

Lin

et al. 2024

ApJ

View full text Add to dashboard Cite

show abstract

“…We next analyze the evolution of the partial Gaussian beam in a GRIN-MMF. The beam evolution in an MMF is a multimodal pattern process in which principal mode propagation is a localization of a group of guided modes and Gaussian mode represents the fundamental fiber mode [42]. Under the parabolic index profile of the MMF, any stationary nonlinear mode undergoes periodic oscillations (also named the periodic self-imaging phenomenon) with a spatial period of z p πa/ 2Δ √ .…”

Section: Input and Propagation Of The Partial Gaussian Beammentioning

confidence: 99%

Oscillating propagation and parametric instability of the partial Gaussian beam in graded-index multimode fibers

et al. 2022

View full text Add to dashboard Cite

We investigate the input and propagation characteristics and geometric parametric instability of the partial Gaussian beam limited by the fiber face area in a graded-index multimode fiber. The theoretical simulation shows that the energy of the partial Gaussian beam and the coupling efficiency of the fiber face are restricted by the fiber face area for the different powers and spot sizes of the input Gaussian beam. The spot intensity pattern of the partial Gaussian beam exhibits a standard oscillating distribution in space as the beam undergoes periodic oscillations with propagation. Also, the dynamic evolution process from parametric sidebands to a supercontinuum is affected by the peak power, the spot size of the partial Gaussian beam, and the fiber length. Finally, the experimental output spectra with different powers of the partial Gaussian beam and fiber lengths in a graded-index multimode fiber confirm the prediction of theoretical simulations. This work provides practical guidance for optimizing supercontinuum source expansion and spectral power density.

show abstract

“…Prior to this, reports have been presented in the field of the electric field of beams inside fibres, encompassing spatial distribution of the mode fields of both straight and bent fibres. Additionally, valuable experimental and theoretical works on this subject, including the analysis of beam modes, have been published [25][26][27][28][29][30][31]. Also, due to reasons such as microscopic bends, voids and cracks, the variation in the diameter and density fluctuation, the transition from one mode to another mode during propagation in the fibre is possible.…”

Section: Introductionmentioning

confidence: 99%

Investigating changes in the electric field profiles of transverse modes in fibres due to bending

Vazeerpour,

Shayganmanesh,

Dorranian

2024

IET Optoelectronics

View full text Add to dashboard Cite

A model is presented for calculating the electric field profiles of transverse modes in fibres. Using this model, the electric field propagation of transverse modes was calculated and compared in both bent and straight Yb and Ho fibres. Our simulations revealed that the field intensities of the modes did not consistently increase or decrease by bending as expected, but rather fluctuated as the bending radii of the fibres changed from 1 to 100 cm. Additionally, it was observed that at certain bending radii, the modes of the fibres became deformed and transitioned into higher modes. Furthermore, the extent to which the modes stretched towards cladding due to bending was calculated. To provide a more comprehensive analysis of the results and investigate the effects of the physical parameters of the fibres on the bent fibre modes, simulation results were presented for two different V numbers and core radii.

show abstract

Light Localization and Principal Mode Propagation in Optical Fibers

Cited by 7 publications

References 25 publications

Coherent Imaging with Photonic Lanterns

Coherent Imaging with Photonic Lanterns

Oscillating propagation and parametric instability of the partial Gaussian beam in graded-index multimode fibers

Investigating changes in the electric field profiles of transverse modes in fibres due to bending

Contact Info

Product

Resources

About