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Bosonic Channel Capacity of a Nonlinear Dispersive Optical Fiber

Navneet K. Sharma, Anirban Pathak

Published Jan 1, 2009• 2 citations
OpenAlex

Abstract

Bosonic channel capacity of some important nonlinear optical channels is studied. In particular, the bosonic channel capacity of a nonlinear dispersive (silica) optical fiber interacting with an intense laser beam has been studied in detail and it has been shown that the channel capacity can be enhanced/tuned by tuning coupling constant, temperature, frequency of the radiations, etc. Further it is shown that channel capacity is not proportional to nonclassicality.

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Bosonic channel capacity of some important nonlinear optical channels is studied. In particular, the bosonic channel capacity of a nonlinear dispersive (silica) optical fiber interacting with an intense laser beam has been studied in detail and it has been shown that the channel capacity can be enhanced/tuned by tuning coupling constant, temperature, frequency of the radiations, etc. Further it is shown that channel capacity is not proportional to nonclassicality.
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In this paper, using the notion of nonlinear coherent states, we define a deformed bosonic dephasing channel modelling the impact of a Kerr medium on a quantum state, as it occurs, for instance, in quantum communication based on optical fibers. We show that, in certain regimes, the Kerr nonlinearity is able to compensate the dephasing. In addition, our studies reveal that the quantum capacity of the deformed bosonic dephasing channel can be greater than that of the undeformed, standard bosonic dephasing channel for certain nonlinearity parameters.
In this paper we investigate the noise properties and classical capacity of an optical fiber which is considered as a quantum channel. The noise is due to nonlinear crosstalk between the modes of dense wavelength division multiplexing system. With displacement operator method the total quantum noise is obtained, and a quantum channel model with attenuation and noise is proposed. We conclude that the noise of the mode is of thermal radiation type if all other modes contribute an equally crosstalk to the one considered. Classical capacity is obtained for given parameters of channel.
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