M. V. Satyanarayana

Bio: M. V. Satyanarayana is an academic researcher from Indian Institute of Technology Madras. The author has contributed to research in topics: Femtosecond pulse shaping & Multiphoton intrapulse interference phase scan. The author has an hindex of 1, co-authored 1 publications receiving 6 citations.

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

Abstract: 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.

Numerical demonstration of generation of bound solitons in figure of eight microstructured fiber laser in normal dispersion regime

Abstract: We have numerically studied passive mode locking in figure of eight laser containing microstructured optical fiber. We demonstrate for the first time to the best of our knowledge the generation of bound states in such configuration in the normal dispersion regime. The numerical simulations are based on extended nonlinear Schrodinger equation using the symmetrized split-step Fourier method. The numerical results show that single pulse or bound solitons can be obtained when the parameters of the cavity are suitably chosen. We identify the small signal gain and the microstructured optical fiber's nonlinear coefficient as key parameters for the generation of bound solitons in figure of eight fiber laser.

Analytical Solutions for the Propagation of UltraShort and UltraSharp Pulses in Dispersive Media

Abstract: Ultrashort pulses are severely distorted even by low dispersive media. While the mathematical analysis of dispersion is well known, the technical literature focuses on pulses, Gaussian and Airy pulses, which keep their shape. However, the cases where the shape of the pulse is unaffected by dispersion is the exception rather than the norm. It is the objective of this paper to present a variety of pulse profiles, which have analytical expressions but can simulate real-physical pulses with great accuracy. In particular, the dynamics of smooth rectangular pulses, physical Nyquist-Sinc pulses, and slowly rising but sharply decaying ones (and vice versa) are presented. Besides the usage of this paper as a handbook of analytical expressions for pulse propagations in a dispersive medium, there are several new findings. The main findings are the analytical expressions for the propagation of chirped rectangular pulses, which converge to extremely short pulses; an analytical approximation for the propagation of super-Gaussian pulses; the propagation of the Nyquist-Sinc Pulse with smooth spectral boundaries; and an analytical expression for a physical realization of an attenuation compensating Airy pulse.

Analytical Solutions for the Propagation of UltraShort and UltraSharp Pulses in Dispersive Media

Abstract: Ultrashort pulses are severely distorted even by low dispersive media. While the mathematical analysis of dispersion is well known, the technical literature focuses on pulses, Gaussian and Airy pulses, which keep their shape. However, the cases where the shape of the pulse is unaffected by dispersion is the exception rather than the norm. It is the objective of this paper to present a variety of pulse profiles, which have analytical expressions but can simulate real-physical pulses with great accuracy. In particular, the dynamics of smooth rectangular pulses, physical Nyquist-Sinc pulses, and slowly rising but sharply decaying ones (and vice versa) are presented. Besides the usage of this paper as a handbook of analytical expressions for pulse propagations in a dispersive medium, there are several new findings. The main findings are the analytical expressions for the propagation of chirped rectangular pulses, which converge to extremely short pulses; an analytical approximation for the propagation of super-Gaussian pulses; the propagation of the Nyquist-Sinc Pulse with smooth spectral boundaries; and an analytical expression for a physical realization of an attenuation compensating Airy pulse.

Dispersion variation in ring-type erbium-doped fiber ultrashort pulse laser with single-wall carbon nanotube-based tapered fiber saturable absorber

Abstract: Dispersion effect on mode-locked ring-type erbium-doped fiber laser was experimentally observed. Cutback method was used on the cavity length to vary the dispersion. Stable pulse trains with 9.27-MHz frequency at optimum pulse duration of 864 fs were achieved when the cavity was composed of 17-m single-mode fiber with 5-m gain medium. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:2374–2376, 2015

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

Abstract: 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.