Control of the temporal and polarization response of a multimode fiber

Mounaix, Mickaël; Carpenter, Joel

doi:10.1038/s41467-019-13059-8

Cited by 32 publications

(24 citation statements)

References 65 publications

(106 reference statements)

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“…One area in which we expect the compressive sampling of TMs to be particularly advantageous is situations in which measurements cannot be made rapidly, for example, when using phase-only spatial light modulators of a relatively low modulation rate or in the case of a low SNR. Compressive sampling also has potential in higher-dimensional cases, such as the measurement of multispectral TMs, for which the number of measurements can run into the hundreds of thousands 41 – 44 .…”

Section: Discussionmentioning

confidence: 99%

Compressively sampling the optical transmission matrix of a multimode fibre

Saunders

Lum

et al. 2021

Light Sci Appl

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The measurement of the optical transmission matrix (TM) of an opaque material is an advanced form of space-variant aberration correction. Beyond imaging, TM-based methods are emerging in a range of fields, including optical communications, micro-manipulation, and computing. In many cases, the TM is very sensitive to perturbations in the configuration of the scattering medium it represents. Therefore, applications often require an up-to-the-minute characterisation of the fragile TM, typically entailing hundreds to thousands of probe measurements. Here, we explore how these measurement requirements can be relaxed using the framework of compressive sensing, in which the incorporation of prior information enables accurate estimation from fewer measurements than the dimensionality of the TM we aim to reconstruct. Examples of such priors include knowledge of a memory effect linking the input and output fields, an approximate model of the optical system, or a recent but degraded TM measurement. We demonstrate this concept by reconstructing the full-size TM of a multimode fibre supporting 754 modes at compression ratios down to ∼5% with good fidelity. We show that in this case, imaging is still possible using TMs reconstructed at compression ratios down to ∼1% (eight probe measurements). This compressive TM sampling strategy is quite general and may be applied to a variety of other scattering samples, including diffusers, thin layers of tissue, fibre optics of any refractive profile, and reflections from opaque walls. These approaches offer a route towards the measurement of high-dimensional TMs either quickly or with access to limited numbers of measurements.

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Section: Discussionmentioning

confidence: 99%

Compressively sampling the optical transmission matrix of a multimode fibre

Saunders

Lum

et al. 2021

Light Sci Appl

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“…In this sense, it is the ultimate form of linear wave control as it requires all the classical linear properties of the wave to be controlled independently and simultaneously. Previous experiments in optics 10 , 13 , 14 have demonstrated spatial control 9 , 15 – 21 , temporal control 22 – 25 or some limited combination of both 26 – 33 . These demonstrations have various implementations, however, they all share an inability to simultaneously control two-dimensional (2D) space, time/frequency and polarisation as completely independent degrees of freedom.…”

Section: Introductionmentioning

confidence: 98%

“…Previous experiments in optics 10,13,14 have demonstrated spatial control 9,[15][16][17][18][19][20][21] , temporal control [22][23][24][25] or some limited combination of both [26][27][28][29][30][31][32][33] . These demonstrations have various implementations, however, they all share an inability to simultaneously control twodimensional (2D) space, time/frequency and polarisation as completely independent degrees of freedom.…”

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confidence: 99%

Time reversed optical waves by arbitrary vector spatiotemporal field generation

et al. 2020

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Lossless linear wave propagation is symmetric in time, a principle which can be used to create time reversed waves. Such waves are special “pre-scattered” spatiotemporal fields, which propagate through a complex medium as if observing a scattering process in reverse, entering the medium as a complicated spatiotemporal field and arriving after propagation as a desired target field, such as a spatiotemporal focus. Time reversed waves have previously been demonstrated for relatively low frequency phenomena such as acoustics, water waves and microwaves. Many attempts have been made to extend these techniques into optics. However, the much higher frequencies of optics make for very different requirements. A fully time reversed wave is a volumetric field with arbitrary amplitude, phase and polarisation at every point in space and time. The creation of such fields has not previously been possible in optics. We demonstrate time reversed optical waves with a device capable of independently controlling all of light’s classical degrees of freedom simultaneously. Such a class of ultrafast wavefront shaper is capable of generating a sequence of arbitrary 2D spatial/polarisation wavefronts at a bandwidth limited rate of 4.4 THz. This ability to manipulate the full field of an optical beam could be used to control both linear and nonlinear optical phenomena.

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“…For this, we leverage the complex spatial mode mixing process performed by a multimode fibre (MMF) by using a transmission matrix (TM) based wavefront shaping technique. The optical TM was introduced by Popoff et al [28] for manipulating monochromatic light through a layer of paint and was then extended to other complex systems such as MMFs [29,30] and can also work with light sources including optical pulses [31,32] and photon-pairs [33]. Recently, the TM was also used to design complex linear optical networks for classical [34] and quantum [35] simulations.…”

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confidence: 99%