A method of obtaining optical comb from Erbium-doped mode-locked fiber laser

Abstract

The invention discloses a method and device for acquiring an optical comb through an er-doped mode-locked fiber laser. The method comprises the steps that the repeated frequency of the optical comb generated by the er-doped mode-locked fiber layer and one mode of the optical comb are simultaneously locked on the three-level structure of a same atomic system to obtain the optical comb with a stable mode, so that a frequency source acquiring device is made to be compact in structure and small in occupied physical space, and therefore the demand for the portability of the frequency source device of applications such as optical fiber communication is met. The method and device can achieve output of laser comb-shaped spectral lines within the range from 1510 nm to 1610 nm, the time domain pulse width of lasers is 150 fs, and the average power is 40 mW. The long-term stability of the repeated frequency is 3E -12, and the long-term stability of a single mode is 7E-12. The index can meet the communication demand based on the optical comb, and great application potentiality is achieved in the optical fiber communication field.

Description

technical field [0001] The invention relates to the technical field of fiber lasers, optical combs and frequency transmission, in particular to a method for generating optical combs from erbium-doped fiber lasers. Background technique [0002] Optical combs based on the mode-locking phenomenon have been used in many fields, especially recently, they have received great attention in the fields of time synchronization and optical fiber communication. In these applications, the linewidth of the comb teeth of the optical comb is required to be less than 100KHz, and it has sufficient long-term stability. Therefore, how to stabilize the optical comb at 1520-1605nm is a key issue, and it is also a great technical challenge. In the prior art, the initial frequency offset value is generally obtained through the f-2f method, and then the repetition frequency or a mode of the optical comb is locked to a very stable frequency source. Such frequency sources include microwave atomic cloc...

AI Technical Summary

Problems solved by technology

The advantage of this method is that the locking index is high, and the disadvantage is that the physical space occupied by the locking part is too large, which cannot meet the portability requirements.

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