Space division multiplex system and method suitable for free space optical communication

Abstract

The invention discloses a space division multiplex system suitable for free space optical communication. The system comprises a sending end device and a receiving end device for communication with the sending end device through a free space. The sending end device comprises a first fourier transform lens, a light combiner and n first spatial light modulators. The receiving end device comprises a second fourier transform lens, a second spatial light modulator and a third fourier transform lens which are arranged in sequence. Space phase factors are attached to signal light beams through the spatial light modulators, the first spatial light modulator is used as a signal modulator, the second spatial light modulator is used as a signal modulator, the light combiner enables a plurality of channels to be combined for transmission, and the fourier transform lenses are used for carrying out space fourier transform on light fields, so that a back focal plane output light field is the fourier transform mode of a front focal plane output light field. The space division multiplex system is simple in structure, low in cost, and easy to achieve, and optical communication capacity is improved in another dimension.

Description

technical field [0001] The invention belongs to the technical field of optical communication, and more specifically relates to a space division multiplexing system and method suitable for free space optical communication. Background technique [0002] With the rapid development of the information industry, people's demand for information has increased sharply. Traditional optical communication is difficult to meet the current needs. Therefore, new dimensions must be added to the original communication system, such as frequency division multiplexing, time division multiplexing, Wavelength division multiplexing, code division multiplexing, polarization multiplexing, quadrature amplitude modulation, etc., as well as space division multiplexing that has not yet entered the practical stage. Space division multiplexing in optical fiber mainly includes mode multiplexing and multi-core fiber multiplexing. These multiplexing techniques are also introduced into free space optical com...

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Problems solved by technology

[0004] Although the orbital angular momentum multiplexing channels can reach infinite number in theory, the number of multiplexing channels is still limited due to factors such as crosstalk between actual channels. In order to further expand the communication capacity, it is still necessary to develop and mine new space division multiplexing technology So far no new means and methods of space division multiplexing have been reported and made public

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