Stable ultrashort pulses have applications in ultrafast laser spectroscopy, biology, medicine, and fiber optic communication. Fiber lasers are capable of producing femtosecond duration pulses at 1.55 micrometers . In the present paper we report our simulations on effect of higher order dispersion parameters on pulse generation and propagation in figure of eight laser.

Theoretical simulations on femtosecond pulse generation in infrared region by a fiber laser

Nonlinear fiber optics concerns with the nonlinear optical phenomena occurring inside optical fibers. Although the field ofnonlinear optics traces its beginning to 1961, when a ruby laser was first used to generate the second-harmonic radiation inside a crystal [1], the use ofoptical fibers as a nonlinear medium became feasible only after 1970 when fiber losses were reduced to below 20 dB/km [2]. Stimulated Raman and Brillouin scatterings in single-mode fibers were studied as early as 1972 [3] and were soon followed by the study of other nonlinear effects such as self- and crossphase modulation and four-wave mixing [4]. By 1989, the field ofnonlinear fiber optics has advanced enough that a whole book was devoted to it [5]. This book or its second edition has been translated into Chinese, Japanese, and Russian languages, attesting to the worldwide activity in the field of nonlinear fiber optics.

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Nonlinear Fiber Optics

A nonlinear amplifying loop mirror has been turned into a laser by feedback of the output to the input through a fibre-pigtailed optical isolator. After some optimisation, pulses as short as 314 fs were produced. The pump powers are low enough that laser diodes could be used for pumping.

Subpicosecond all-fibre erbium laser

Theoretical simulations have been carried out to achieve ultrafast pulse generation in an all-fiber laser known as a figure-of-eight laser (F8L). It is observed that the higher order nonlinear dispersions play a vital role in determining the stability of the output pulse on a femtosecond (fs) time scale. Best fit parameters for F8L to generate pulses as short as 420 fs are reported here. © 2001 John Wiley & Sons, Inc. Microwave Opt Technol Lett 28: 196–198, 2001.

Theoretical simulations on femtosecond pulse generation in infrared region by a fiber laser

References

Nonlinear Fiber Optics

Subpicosecond all-fibre erbium laser

Effect of higher order nonlinear dispersion on ultrashort pulse evolution in a fiber laser

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