Natural polarization state single wavelength light source and method

Abstract

The invention discloses a natural polarization state single wavelength light source and a method. The light source consists of a first semi-conductor light amplifier with a current pump, a fiber grating and a polarization independent isolator, wherein the fiber grating is connected to one end of the first semi-conductor light amplifier; the reflection wavelength of the fiber grating is in the gain spectrum of the first semi-conductor light amplifier; and the other end of the first semi-conductor light amplifier is connected to the input end of the polarization independent isolator. The method has the following steps that: generating spontaneous radiation by the first semi-conductor light amplifier driven by the current; directly outputting forward spontaneous radiation light through the polarization independent isolator; filtering the backward spontaneous radiation light through the fiber grating and reflecting spontaneous radiation light with narrow-band wavelength; outputting and consuming the spontaneous radiation light of other wavebands from the other end of the fiber grating after the spontaneous radiation light of other wavebands being transmitted; and outputting the spontaneous radiation light reflected by the fiber grating from the polarization independent isolator after being amplified by the first semi-conductor light amplifier again. According to the natural polarization state single wavelength light source and the method, the single wavelength natural polarization light can be directly output, so that the energy conversion efficiency is high; and the natural polarization state single wavelength light source and the method disclosed by the invention are convenient to realize and simple in structure.

Description

technical field [0001] The invention relates to the field of optics, in particular to a single-wavelength light source and method with a natural polarization state. Background technique [0002] Common light sources such as semiconductor lasers and fiber lasers have a high degree of linear polarization. During the transmission of optical signals in the optical fiber, due to the inevitable small asymmetry of the fiber core structure, the inhomogeneity of the refractive index distribution, the asymmetry of the external or internal transverse stress, and the twisting, bending or external application of the optical fiber The electromagnetic field will cause the fiber to have a birefringence effect, which will cause the polarization direction and polarization degree of linearly polarized light to change randomly after a certain distance in the fiber. [1] In applications such as high-speed optical fiber communication, optical fiber sensing, and optical fiber gyroscope, random cha...

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Problems solved by technology

[0019] Superluminescent light-emitting diodes (SLD / SLED) have low efficiency, poor stability, low coupling efficiency with single-mode fiber, and, like fiber ASE light sources, have a large spectral width, which is not conducive to systems requiring single wavelength or narrow spectrum middle application

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