A system for simultaneously providing wired and single sideband wireless traffic based on single modulator

Abstract

The invention belongs to the technical field of optical fiber wireless communication, and particularly relates to a system for simultaneously providing wired and single sideband wireless services based on a single modulator. The system comprises a laser used for generating optical carriers, two signal generators used for generating base band signals, a local oscillator used for generating single-frequency electric carriers, a dual-polarization binary phase shift keying modulator used for modulating wired and wireless signals to two orthogonal polarization states of light respectively, and a phase shift keying modulator used for generating phase shift keying signals; a frequency multiplier, a frequency mixer, a power divider, a phase regulator, an electric amplifier and the like. Modulationof wired and single-sideband wireless signals can be completed by adopting the dual-polarization binary phase shift keying modulator, fusion of wired and single-sideband wireless services is realizedby utilizing a polarization multiplexing technology, and the problem of mutual crosstalk of wired and single-sideband wireless services at a receiving end is solved. By adjusting the bias voltage ofthe modulator and the phase difference of the radio frequency signal, single sideband modulation is directly realized, the use of an optical filter can be avoided, and the cost is saved.

Description

technical field [0001] The invention belongs to the technical field of optical fiber-wireless communication, and in particular relates to a system for simultaneously providing wired and single-sideband wireless services based on a single modulator. Background technique [0002] In recent years, with the rapid development of various emerging services such as cloud computing, multimedia services, and interactive games, the generation of various new technologies requires a large amount of data traffic, and the capacity requirements of communication networks continue to increase. The millimeter wave frequency band can support larger bandwidth and higher rate, and expand the system capacity, so the frequency band of mobile communication is moving towards the higher frequency millimeter wave band. Optical fiber communication has a wide frequency transmission frequency, strong anti-interference, and low signal attenuation, and has become the main transmission method in world commun...

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Problems solved by technology

[0003] In other wireless and wired fusion schemes, some scheme systems require multiple modulators to modulate signals in different frequency bands, and the structure is complex

Although some schemes use a single modulator to generate wired and wireless signals, there is a problem of mutual interference between wired and wireless signals, and because double-sideband modulation is used, it will be affected by the walk-off effect caused by fiber dispersion.

In order to solve this effect, some schemes use optical filters or other optical devices to filter out one sideband of the double-sideband signal to obtain a single-sideband signal, thereby overcoming the walk-off effect of fiber dispersion, but this will undoubtedly increase the system cost, and when the frequency of microwave / millimeter waves changes, the method of generating SSB signals through filters is not flexible enough

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