System providing both wired and SSB wireless services based on a single modulator

Abstract

The invention belongs to the technical field of optical fiber-wireless communication, in particular to a system for simultaneously providing wired and single-sideband wireless services based on a single modulator. The system of the present invention includes: a laser for generating an optical carrier, two signal generators for generating a baseband signal, a local oscillator for generating a single-frequency electrical carrier, and a two-phase signal generator for respectively modulating wired and wireless signals into light. Dual-polarization binary phase-shift keying modulator on two orthogonal polarization states, and frequency multiplier, mixer, power splitter, phase adjuster and electric amplifier etc.; The present invention adopts dual-polarization binary phase-shift keying The modulator can complete the modulation of wired and SSB wireless signals, and realize the integration of wired and SSB wireless services by using polarization multiplexing technology, which overcomes the mutual crosstalk between the two at the receiving end. At the same time, by adjusting the bias voltage of the modulator and the phase difference of the radio frequency signal, the single sideband modulation is directly realized, which can avoid the use of optical filters and save costs.

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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