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Numerical analysis of multifrequency erbium-doped fibre ring laser employing periodic filter and frequency shifter

Numerical analysis of multifrequency erbium-doped fibre ring laser employing periodic filter and frequency shifter

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Numerical analysis of a recently proposed multifrequency erbium-doped ring laser employing a frequency periodic filter and frequency shifter is presented. The model is based on a homogeneously broadened three-level approximation of an erbium ion. The multifrequency operation is achieved by shifting the frequency of the amplified spontaneous emission (ASE) power circulating in the ring cavity by one wavelength slot each circulation period to prevent steady-state single-frequency laser operation. The effect of cavity loss, erbium-doped fibre (EDF) gain, direction of ASE circulation on lasing spectrum uniformity and output power is investigated.

Inspec keywords: optical fibre losses; superradiance; erbium; laser theory; ring lasers; fibre lasers; laser cavity resonators

Other keywords: homogeneously broadened three-level approximation; amplified spontaneous emission power circulation; output power; numerical analysis; multifrequency operation; steady-state single-frequency laser operation; multifrequency erbium-doped fibre ring laser; frequency shifter; wavelength; periodic filter; Er-doped cavity loss fibre gain; lasing spectrum uniformity; erbium ion; ASE circulation

Subjects: Laser resonators and cavities; Stimulated emission (condensed matter); Fibre optics; Laser resonators and cavities; Fibre lasers and amplifiers; Fibre lasers and amplifiers; Optical propagation, dispersion and attenuation in fibres

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