Broadband light source

Abstract

The invention discloses a broadband light source. The broadband light source comprises a first optical splitter, a first wavelength division multiplexer, an ytterbium doped fiber, an isolator and a second optical splitter which are sequentially connected. The first wavelength division multiplexer is further connected with a pump. The broadband light source is characterized in that the isolator is connected in an optical fiber ring of the first wavelength division multiplexer. As an improvement of the broadband light source, the second wavelength division multiplexer is connected between the first wavelength division multiplexer and the pump. Due to the adoption of the technical scheme, the self-excitation phenomenon occurring when power of the structure of the optical fiber ring plus a single-stage amplifying structure ASE is larger than 20mW is avoided. Spectrum of the broadband light source is less than 2dB in flatness in positions of 1040-1085nm, so that the broadband light source is flatter and more practical than a double-stage structure. The broadband light source is lower in cost than a double-stage light path due to the fact that the number of passive devices is smaller, and active fiber is shorter when power output is the same.

Description

technical field [0001] The invention relates to the field of optical fiber amplifiers, in particular to broadband light sources. Background technique [0002] ASE light source refers to a broadband light source based on the principle of amplified spontaneous emission of active optical fiber. Such as figure 1 As shown, at present, for the ASE light source made of ytterbium-doped fiber, when the power is less than 20mW, the fiber coil + single-stage structure made of a 50:50 beam splitter is used. When the power of this structure is greater than 20mW , will appear as figure 2 The self-excited phenomenon shown, so when the power is greater than 20mW, a two-stage amplification structure is generally used, but with this structure, more passive components are required, the active fiber is longer, and the cost is higher, and if image 3 with Figure 4 As shown, the flatness of the spectrum is poor, and there is a deviation compared with the ring cavity plus single-stage struct...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problems existing in the prior art, and provide a new type of optical fiber coil + single-stage amplification structure broadband light source, which solves the self-excitation phenomenon when the power is greater than 20mW

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