Method for controlling optical deformed waves to generate adjustable super-continuum spectrum

Abstract

The invention discloses a new method for controlling optical deformed waves to generate an adjustable super-continuum spectrum. The method is characterized by comprising the following steps of injecting two identical monochromatic laser light sources into a two-stage cascaded optical fiber through optical coupling beat frequency and receiving output signals, wherein the first light source is usedas a pump light source, and the second light source is used as a signal light source. A two-stage cascaded optical fiber structure is adopted, the first grade is a single zero dispersion optical fiber, an optimum modulation frequency is selected to inhibit influence of noise on pulse evolution and induce the optical deformed waves to be generated relatively stably, and suitable modulation depth and optical fiber length are selected to make the optical deformed waves have higher output intensity. The second grade is a double zero dispersion optical fiber and used for controlling the optical deformed waves; by selecting the double zero dispersion optical fiber with different zero dispersion point positions, the optical deformed waves are transformed into forms of base-order solitons or dispersive waves, therefore, the smooth super-continuum spectrum with different bandwidth ranges are obtained, and meanwhile bad influence of the optical deformed waves on signal transmission of an opticalfiber system is avoided.

Description

technical field [0001] The invention relates to cascaded optical fibers, which are used to control optical abnormal waves and obtain adjustable supercontinuum generation. Background technique [0002] In the field of nonlinear optics, supercontinuum generation in optical fibers is a very meaningful research topic. Since the generation of supercontinuum was first reported in 1970, it has been widely used in optical frequency measurement, pulse compression, optical coherence tomography and other aspects. The high stability, wide bandwidth, and high smoothness of supercontinuum play a crucial role in facilitating its application. When long pulses (such as picoseconds, nanoseconds or continuous waves) are used as pump pulses, the generated supercontinuum has some obvious advantages, such as higher spectral power density and smoother spectrum, so it has more Wide applicability. At this point, the noise-induced modulation instability plays an important role in the initial stage...

AI Technical Summary

Problems solved by technology

Under the condition of noise-induced modulation instability, the generation of optical distortion waves is extremely unstable, and the extremely high intensity of optical distortion waves is also very harmful to the signal transmission of optical fiber systems

At the same time, most of the energy of the output pulse is concentrated on the optical distortion wave, which largely inhibits the generation of smooth and broadband supercontinuum

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