Tunable multi-wavelength erbium-doped fiber laser

Abstract

The invention provides a tunable multi-wavelength erbium-doped fiber laser and a method of the tunable multi-wavelength erbium-doped fiber laser. The tunable multi-wavelength erbium-doped fiber laser comprises a tunable pump light source, erbium-doped fibers, polarization controllers, an opto-isolator, a tunable comb filter, a nonlinear fiber loop mirror and an output coupler. Switching of different wavelength intervals and tuning of wave peak positions in each wavelength interval are achieved by adjusting the incident laser polarization state of the M-Z interference filter; adjustment on the wavelength number and the spectral range is achieved by adjusting the working state of the nonlinear fiber loop mirror; the wavelength number is accurately controlled by adjusting the pumping power. The tunable multi-wavelength erbium-doped fiber laser is formed by all optical devices, and is good in compatibility, convenient to tune, low in cost, capable of achieving stable multi-wavelength output at the indoor temperature and capable of meeting the demands of a wavelength division multiplexing system or the optical time division multiplexing communication technology for a multi-wavelength laser source.

Description

technical field [0001] The invention relates to the field of fiber lasers, in particular to a multi-wavelength erbium-doped fiber laser. Background technique [0002] Multi-wavelength fiber laser has the advantages of compatibility with optical fiber and optical fiber devices, narrow line width, high output power, low intensity noise, excellent stability, and can provide the required light source for multiple channels at the same time. It has important applications in fields such as resolution optical debugging. Especially in recent years, with the rapid development of dense wavelength division multiplexing (DWDM) technology in optical fiber communication, it is required to realize the adjustment function of wavelength interval and spectral position while obtaining multi-wavelength output. Obviously, the multi-wavelength output of lasers can no longer meet the needs of optical communication, optical sensing and other technologies. Therefore, as an important light source, t...

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Problems solved by technology

Such as (non-patent literature Daru Chen, et al. Channel-spacing-tunable multi-wavelength fiber ring laser with hybrid Raman and Erbium-doped fiber gains. Optics Express, Vol.15, Issue3, pp.930-935 (2007)), Although the wavelength spacing can be changed, it requires the introduction of an optical phase delay line in one arm of the M-Z interferometer, and also requires control equipment, which makes the structure very complex and expensive

Also (non-patent literature Ai-Ping Luo, et al.Tunable and switchable multiwavelength erbium-doped fiber ring laser based on a modified dual-pass Mach-Zehnder interferometer. Optics Letters, Vol.34, Issue14, pp.2135-2137 (2009 )) Although certain tunable characteristics have been achieved, it uses piezoelectric ceramics wrapped around single-mode fibers as a phase modulator to suppress the mode competition caused by the uniform broadening characteristics of erbium-doped fibers. This method is easily affected by external electromagnetic interference , which reduces the stability of the system

[0006] It can be seen that there are many related technologies for obtaining tunable multi-wavelength lasers, but there is no ideal solution to the problem of how to obtain "stable performance" and "full-featured" tunable multi-wavelength fiber lasers.

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