Combination and Compression of Multiple Pulses With Same or Different Wavelengths

Abstract

We propose a practical scheme to demonstrate the combination and subsequent self-similar compression of two pulses with the same or different central wavelengths while propagating through a nonlinear fiber with exponentially decreasing dispersion. To initiate these processes, two raised cosine pulses with the same or different wavelengths is modulated using a phase modulator to acquire the same chirp at the input of the fiber. While propagating through the nonlinear fiber, these chirped pulses first coalesce into a single pulse and during further propagation get compressed into a single ultrashort high-power pulse. The output pulse possesses a large compression factor, high proportion of energy and peak power compared to a single input pulse. We also report the combination and compression of five raised cosine pulses with different wavelengths to achieve an appreciable compression effect, indicating that this system works well even with a small number of input pulses. The proposed scheme provides a simple way to generate high power ultrashort pulse with high energy and good quality in a short length of fiber.

Simultaneous Pulse Combination and Nearly Self-Similar Pulse Compression in Tapered Silicon Waveguides at Around 2.0 μm

“…From the analysis in the previous research, the realization of the Si-TPCC process depends strongly upon the GVD decreasing exponentially [24], [25]. In this line, the decreasing exponentially GVD is described approximately as,…”

“…To ensure broader applicability of the same or different central wavelengths, we employ the following two chirped RC pulses to examine the Si-TPCC, which are expressed as [25],…”

“…Previously, much of the advances on pulse compression has concentrated on the single-pulse compression. To obtain the extra functionalities of pulse controlling, the efficient multiplepulses combination and compression was firstly proposed in the exponentially dispersion decreasing nonlinear fiber, which indicates the ultimate compressed pulse possesses higher energy and comprises major portion of the total input light wave energy [24], [25]. However, the optical fiber is placing a serious challenge on the miniaturization and integration in the chip-scale.…”

Simultaneous Combination and Nearly Self-similar Pulse Compression of Five Pulses at Different Wavelengths

“…Five different-wavelength RC pulses expressed as follows are considered as the input light signal: (1) where T0 and P0 account for the initial pulse width and initial peak power (P0 = 0.5|b20|/g /T0 2 ), respectively. Simulation of the pulses propagation in dispersion decreasing nonlinear fiber is performed using generalized nonlinear Schrödinger equation (GNLSE) model [5]. In the GNLSE model, b 2(z) decreases exponentially as b 2(z) = b 20 exp (-s z), where b 20 is the group-velocity dispersion (GVD) at the beginning of the fiber z = 0.…”

Stable transmission characteristics of double-hump solitons for the coupled Manakov equations in fiber lasers

“…Apart from being used in the communications field, optical solitons can also be used to construct optical switches. The advantage of optical soliton communication is that it does not change its shape when it interacts with other pulses [12,13].…”