Estimation of inter-modal cross talk in a modal wavefront sensor

Konwar, Santanu; Boruah, Bosanta R.

doi:10.1364/osac.1.000078

Cited by 11 publications

(6 citation statements)

References 21 publications

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“…However, when we consider the presence of more than one Zernike mode in the beam then we should take into account the intermodal cross talk, while the modes are measured at the receiving station. We nevertheless can choose combinations of Zernike modes which have the minimal intermodal cross talk with respect to one another 32 . If we consider n number of Zernike modes, each having m different ϕ RMS values, then there will be m n number of unique linear combinations of n Zernike modes.…”

Section: Resultsmentioning

confidence: 99%

Leveraging the orthogonality of Zernike modes for robust free-space optical communication

Konwar

Boruah

2020

Commun Phys

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Free-space optical communication systems exploit the properties of light beams to transfer information through a free-space link. Indeed such systems provide an exciting alternative for communication. Here we introduce information transfer through free-space using a laser beam having its phase encoded with multiple orthogonal aberration modes. We use Zernike polynomials, which form a complete basis set, to represent the aberration modes. The user information is converted to co-efficients of the Zernike modes which are summed digitally to obtain the resultant phase profile. A single phase modulating device then reads the resultant phase to shape the wavefront of the beam to be transmitted. The receiving station estimates the co-efficients of all modes in the beam from a single measurement of a wavefront sensor, to retrieve the user information. We demonstrate data transfer using multiple modes, each with multiple strengths, and external perturbation compensation using the completeness property of the modes.

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Section: Resultsmentioning

confidence: 99%

Leveraging the orthogonality of Zernike modes for robust free-space optical communication

Konwar

Boruah

2020

Commun Phys

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“…The use of several separate channels with holograms filtering only one of the Zernike modes in the WFS is impractical, since in this case the sensor becomes bulky and the intensity of the radiation incident on each of the holographic elements decreases (inversely proportional to the square of the number of channels). Therefore, the desire of researchers to use WFS with multiplex holograms [162][163][164][165][166][167][168][169][170] is justified.…”

Section: Current and Future Challengesmentioning

confidence: 99%

Roadmap on holography

Sheridan¹,

Kostuk²,

Gil³

et al. 2020

J. Opt.

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“…However when we consider the presence of more than one Zernike mode in the beam then we should take into account the intermodal cross talk while the modes are measured at the receiving station. We nevertheless can choose combinations of Zernike modes which have the minimal inter-modal cross talk with respect to one another [9]. If we consider n number of Zernike modes, each having φ RMS = a j where j = 1 → m, then there will be m n number of unique linear combinations of n Zernike modes.…”

Section: Multiplexing Of Zernike Modes To Encode the User Informationmentioning

confidence: 99%

Steady information transfer through free-space employing orthogonal aberration mode division multiplexing

Konwar,

Boruah

2019

Preprint

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In this paper we propose and experimentally demonstrate information transfer through free-space using a laser beam encoded with multiple orthogonal aberration modes in its phase profile. We use Zernike polynomials which forms a complete set of basis functions to represent the aberration modes. The user information is encoded as amplitudes of multiple Zernike modes whose linear combination is used to define the wavefront of the laser beam in the transmission station. It therefore requires a single phase modulating device since the multiplexing is done digitally providing flexibility over the number and type of modes used. The receiving station uses a wavefront sensor that gives a direct measure of all the aberration modes from a single measurement which is decoded to retrieve the user information. The transmission mechanism enables the use of multiple modes and multiple strengths of each mode to encode the user information and external perturbation compensation, utilizing the completeness of the orthogonal modes.

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Estimation of inter-modal cross talk in a modal wavefront sensor

Cited by 11 publications

References 21 publications

Leveraging the orthogonality of Zernike modes for robust free-space optical communication

Leveraging the orthogonality of Zernike modes for robust free-space optical communication

Roadmap on holography

Steady information transfer through free-space employing orthogonal aberration mode division multiplexing

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