Measuring the spatial polarization distribution of multimode beams emerging from passive step-index large-mode-area fibers

Flamm, Daniel; Schmidt, O.; Schulze, Christian; Borchardt, Julia; Kaiser, Thomas; Schröter, Siegmund; Duparré, Michael

doi:10.1364/ol.35.003429

Cited by 47 publications

(28 citation statements)

References 11 publications

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“…We have demonstrated a composite detection method with which to analyze the effects of fiber propagation on these modes, using step-index fibers as an example. This technique can be extended to investigate the fiber propagation of unknown vector beams [27].…”

Section: Resultsmentioning

confidence: 99%

Fiber propagation of vector modes

Ndagano¹,

Brüning²,

McLaren³

et al. 2015

Opt. Express

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107

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Abstract:Here we employ both dynamic and geometric phase control of light to produce radially modulated vector-vortex modes, the natural modes of optical fibers. We then measure these modes using a vector modal decomposition set-up as well as a tomography measurement, the latter providing a degree of the non-separability of the vector states, akin to an entanglement measure for quantum states. We demonstrate the versatility of the approach by creating the natural modes of a step-index fiber, which are known to exhibit strong mode coupling, and measure the modal cross-talk and non-separability decay during propagation. Our approach will be useful in mode division multiplexing schemes for transport of classical and quantum states.

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Section: Resultsmentioning

confidence: 99%

Fiber propagation of vector modes

Ndagano¹,

Brüning²,

McLaren³

et al. 2015

Opt. Express

Self Cite

107

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show abstract

“…16 For that the determination of the modal decomposition of the beam is successively done for the six different polarization states. This states are linear polarization with 0 • , 45•, 90• and 135 • orientation, respectively, as well as the left and right handed circular polarization, which enables the measurement of the Stokes vector for each LP mode.…”

Section: Full Vector Mode Analysismentioning

confidence: 99%

Determination of the physical fiber modes

et al. 2015

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In multi mode optical fibers degenerated modes occur, which cannot be discriminated by their propagation properties. Hence, in principle any arbitrary superposition of these degenerated modes can be used to build an equivalent set of modes. In a perturbed system this degeneracy can be broken, and as a consequence -not every superposition represents real modes of the fiber. In mode division multiplexing system this leads to high inter-modal crosstalk, if unsuitable (initially degenerated) modes are chosen. Based on the analysis of the fiber's transmission matrix, we present a measurement scheme to prove degeneracy breaking and to identify physical non-degenerated modes.

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“…The theory for measuring the expansion coefficientsc l is described at full length by Flamm et al 13 Since this measurement technique principally consists of six scalar measurements, we are hereinafter discussing the scalar field expression…”

Section: The Modes Of Weakly Guiding Fibersmentioning

confidence: 99%

“…10 The combination of the CFM with a Stokes parameter measurement provides modally resolved information about amplitudes, phase differences and even polarization states. 13 Hence, the full information about the optical vector field becomes available.…”

Section: Introductionmentioning

confidence: 99%

Mode analysis of LMA fibers using the correlation filter method

et al. 2012

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We present the correlation filter method for measuring the modal power spectrum of beams emerging from multi-mode optical fibers. An optical filter acts as central element of the measurement process performing the integral relation of correlation. This filter is realized by a computer-generated hologram with a specifically designed transmission function based on the spatial distribution of guided modes in the investigated waveguide. The correlation filter method provides modally resolved information about amplitudes, phase differences and polarization states. Hence, the full information about the optical field becomes available. Beside a detailed presentation of the measurement process, the setup and the design of the correlation filters, the major advantage of the method, the ability to perform real-time measurements, is introduced.

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Measuring the spatial polarization distribution of multimode beams emerging from passive step-index large-mode-area fibers

Cited by 47 publications

References 11 publications

Fiber propagation of vector modes

Fiber propagation of vector modes

Determination of the physical fiber modes

Mode analysis of LMA fibers using the correlation filter method

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