Multiple wavelength optical fiber laser based on semi-conductor optical amplifier

Abstract

The present invention relates to optical fiber laser field and relates to a multi-wavelength optical fiber laser based on semiconductor optical amplifier, which includes a optical fiber annular cavity and a high birefraction optical fiber annular mirror, wherein the optical fiber annular cavity is composed by connecting a output coupler, a semiconductor optical amplifier provided with light isolator on two ends, a optical fiber circulator and a first optical fiber polarization controller in series; the high birefraction optical fiber annular mirror includes a 3dB coupler, high birefraction optical fiber and a second optical fiber polarization controller, wherein one end of the 3dB coupler is connected to the optical fiber circulator; the second optical fiber polarization controller and the high birefraction optical fiber is connected between the two ends in series. Stable output of multi- wavelength inside L strip can be obtained under room temperature through the invention, wavelength interval can meet 100GHz of WDM ITU standard, and the whole device can be adjusted continuously within the scope of 50GHz; laser output wavelength width is smaller than 0.1nm; each channel power output is equal; each wavelength power difference is smaller than 6dB; signal-noise ratio is bigger than 25dB.

Description

technical field [0001] The invention relates to a semiconductor optical amplifier-based multi-wavelength fiber laser suitable for a wavelength division multiplexing (WDM) system, which is applied in the fields of optical fiber communication, optical sensing, high-resolution optical testing and the like. Background technique [0002] Multi-wavelength lasers can simultaneously output multiple wavelengths with small wavelength intervals, narrow line widths, and flat power spectra. Therefore, it can effectively utilize the characteristics of DWDM networks, facilitate dynamic allocation of wavelength channels, effectively avoid network conflicts and make full use of network capacity, reducing operators' wavelengths. backup, significantly reducing costs. [0003] At present, multi-wavelength fiber optic light source has become a hot spot, which includes multi-wavelength lasers based on multiple independent distributed feedback laser diodes (DFB-LD) or monolithic integrated multi-w...

AI Technical Summary

Problems solved by technology

However, the uniform broadening characteristics of erbium fiber limit the output results is a difficult point

At room temperature, the uniformly broadened linewidth of erbium fiber exceeds 10nm, making it impossible to achieve stable multi-wavelength output under ordinary conditions

At present, it is solved by using liquid nitrogen to cool the EDF, using multi-core or elliptical EDF, and inserting a frequency shifter in the resonator, which increases the complexity and cost of the laser.

[0007] In addition, the pump power required by Raman multi-wavelength fiber lasers to obtain multi-wavelength output is very high, and the domestic production of high-power semiconductor pump tube technology is still very immature, and there are few products

Using the Raman effect to generate multi-wavelength output also requires the frequency shift of the front-stage stokes to excite the post-stage frequency shift, so the number of wavelengths that can be obtained is small (generally only 3 to 4), the uniformity of the power spectrum is poor, and the preparation of the laser high cost

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