Programmable multi-wavelength adjustable optical fiber laser and multi-wavelength filtering method thereof

Abstract

The invention relates to and provides a programmable multi-wavelength adjustable optical fiber laser and a multi-wavelength filtering method thereof. A frequency-selecting scheme of the invention solves the difficult problems of the wavelength amount and wavelength intervals which are independent and continuously adjustable in the gain range of the conventional optical fiber laser, and solves the difficult problems that the switching time of the laser wavelength is long and the frequency positioning precision is low. The output wavelength, amount and wavelength intervals of the programmable multi-wavelength adjustable optical fiber laser can be selected in a digitalized manner, and the optical fiber laser combines the fast scan and the flexible addressing. The technical scheme is that the optical fiber laser comprises a semiconductor light amplifier, an opto-isolator, a multi-wavelength adjustable optical fiber grating filter and an optical fiber coupler all connected in sequence through optical fibers, wherein the multi-wavelength adjustable optical fiber grating filter comprises a program control heating print head, a first broadband linear chirp optical fiber Bragg grating and a programmable control circuit; the first broadband linear chirp optical fiber Bragg grating is tightly fitted with a heating array of the program control heating print head in the direction of the heating array; and a programmable logic controller controls the local heating at the corresponding position of the heating array of the program control heating print head according to the required lasing wavelength.

Description

Technical field [0001] The present invention relates to the field of tunable multi-wavelength fiber lasers and optical communications, in particular to a multi-wavelength tunable fiber laser based on broadband linear chirped fiber Bragg grating (hereinafter referred to as LCFBG). Background technique [0002] The optical network is developing towards a dynamic optical network. The existing fixed channel frequency interval cannot effectively use the spectrum resources of the optical fiber, thus restricting the effective expansion of the optical fiber transmission capacity. In order to solve this problem, multi-wavelength tunable fiber lasers adapted to flexible grid technology have become a current research hotspot. [0003] Multi-wavelength tunable fiber lasers have the advantages of compatibility with fiber optic devices, wide bandwidth, narrow line width, high output power, low intensity noise, excellent stability, and flexibility to output different numbers of wavelengths. It is...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the technical problems existing in the prior art, the present invention provides a programmable multi-wavelength tunable fiber laser and its multi-wavelength filtering method, which overcomes the shortcomings of traditional fiber laser mechanical frequency selection and solves the problem within the gain range of fiber lasers. The number of wavelengths and the wavelength interval can be independently and continuously adjustable; the number of output wavelengths and the wavelength interval can be selected digitally, taking into account both fast scanning and flexible addressing

Solved the problems of long laser wavelength switching time and low frequency positioning accuracy

Images