Tunable multi-wavelength light source and modulation method thereof

Abstract

The invention belongs to an emission subsystem of a communication system, and relates to a tunable multi-wavelength light source and a modulation method thereof. The tunable multi-wavelength light source comprises a wavelength tunable narrowband light source, a polarization controller, an IQ modulator, a microwave signal source and a power divider. Continuous light emitted by a laser is input to the light port of the IQ modulator through the polarization controller, radiofrequency signals of the microwave signal source are divided into two paths through the power divider, the two paths of signals are respectively input to the microwave ports of an upper arm and a lower arm of the IQ modulator, according to a balance condition, upper-arm offset voltage and lower-arm offset voltage of the IQ modulator and the amplitude of upper-arm and lower-arm sinusoidal modulation signals are adjusted, and finally, five flat spectral lines with intervals of f, i.e., a generated light comb, are obtained at the output light port of the IQ modulator. According to the invention, the center wavelength and the wavelength interval can be flexibly adjusted, and compared to a conventional a multi-wavelength light source composed of a laser array, the tunable multi-wavelength light source has the advantages of low energy consumption, easy tuning and the like. Therefore, the tunable multi-wavelength light source and the modulation method can be widely applied to the field of light communication.

Description

technical field [0001] The invention relates to a tunable multi-wavelength light source for a dense wavelength division multiplexing system and a modulation method thereof. Background technique [0002] Dense WDM (DWDM, Wavelength Division Multiplexing) technology is to combine a variety of optical carrier signals of different wavelengths through a multiplexer at the transmitting end, couple them into an optical fiber for transmission, and demultiplex the optical waves at the receiving end. Optical carriers of individual wavelengths are separated and processed. Among them, the UDWDM channel spacing is usually less than 0.2nm, and more than 80 light waves of different wavelengths can be multiplexed, which greatly increases the transmission capacity of a single fiber. [0003] In order to produce ultra-dense and spectrally flat multi-wavelength light sources for DWDM systems, there are many methods in the industry, such as laser arrays, cyclic frequency shift methods, methods...

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is to provide a tunable multi-wavelength light source and its modulation method to overcome the defects of large system energy consumption and high cost in the existing linear modulation technology

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