Broadband optical chaos for stimulated Brillouin scattering suppression in power over fiber

Abstract

Broadband chaos generated in an optically injected semiconductor laser is applied for power-over-fiber transmission. By varying the injection power, period-one oscillation, period-two oscillation, and chaotic oscillation are observed in the injected slave laser, indicating a period-doubling route to chaos. Compared to the free-running output of the laser, its chaotic output has a drastically increased signal bandwidth, which leads to a 19 dB increase of the stimulated Brillouin scattering threshold. Using a chaos of 5:2 GHz bandwidth, a maximum optical power of 27 dBm is obtained after 20 km transmission over fiber, which is applicable to optically powering some advanced communication networks. The approach uses the inherent nonlinear laser dynamics, which requires no modulation electronics or microwave signal sources.

Investigation of the Dynamical Behavior of a High-Power Laser Diode Subject to Stimulated Brillouin Scattering Optical Feedback

“…In the COF configuration, the back-scattered light is measured as only 32 µW at 1000 mA and the curve is similar to L-I curve as the green curve (lowest curve) manifests. As the laser outputs chaotic signal in this configuration, it is expected that no SBS is present [20] and the back-scattered light shown in the figure is thought to be as a result of Rayleigh scattering. The scattering rate is measured as −36.7 dB which is similar to the one in the open-loop configuration.…”

“…Recently, chaotic lasers have been used in the Brillouin scattering area such as suppression of stimulated Brillouin scattering (SBS) [20], Brillouin optical correlation-domain reflectometry and analysis [21] and dynamic Brillouin grating generation [22], [23]. SBS is an inelastic nonlinear scattering that occurs due to the interaction between the pump and Stokes fields through an acoustic wave.…”

“…A high power laser diode is used for stimulating Brillouin scattering in a 4km-long fibre. Although chaotic behaviour of a laser diode reduces SBS significantly [20], the laser diode shows different dynamical behaviours by injecting back the stimulated Brillouin scattered light into the laser diode. The results will be compared with the ones in a conventional optical feedback (COF) in terms of L-I curves and radiofrequency (RF) spectra.…”

Performance improvement of power-over-fiber system using noise-modulated laser diode

“…In a power-over-fiber system, an optical fiber is utilized to combine a high-power laser diode and a photodetector to supply electrical power for a remote site. Thus, it is immune to electromagnetic perturbations, electric shocks, and lightning [3][4][5][6]. However, due to the stimulated Brillouin scattering (SBS) effect in optical fiber, the transmission light power in a power-over-fiber system cannot unlimitedly increase when the injected light power goes up [7][8][9].…”

Random bit generation using an optically injected semiconductor laser in chaos with oversampling

“…The optical frequency detuning of the master laser from the slave laser is about 12.5 GHz. Such optical injection drives the slave laser into chaotic oscillation [12,13]. Chaotic oscillations are capable of amplifying the effects of intrinsic laser noise [14].…”