We analyze the transition from slow to fast light upon increasing the modulation frequency based on coherent population
oscillation in Cascaded Erbium-doped fiber structure. The change from slow to fast light is more obvious in the
Cascaded structure. In this structure, the transition bandwidth is lager and the relative delay difference between the
maximum fractional advancement and the maximum fractional delay is greater than that in the single-stage fiber.
Fast and slow light in optical fibers was a powerful tool for future all-optical networks. We observed fast and slow light
based on the stimulated Brillouin scattering using the gain region in optical fibers just adjusting the pump power
experimentally. In this paper, the time delay as a function of the pump signal power, Stokes signal power and the fiber
length were studied.
Three-wave coupled equations of optically-controlled group velocity of light based on stimulated Brillouin scattering
(SBS), together with their boundary and initial conditions, are solved using finite difference method. Relations of system
time delay, pulse broadening factor and changes of pulse shape with gain parameter are obtained, further more,
circumstance with different stokes power, pulse width, fiber length are discussed.
With a 10-km single-mode fiber and a pair of fiber Bragg gratings (FBGs), we design four different linear cavity structures for supercontinuum (SC) generation using a cw Raman fiber laser (RFL) as pump. The output characteristics of the generated SC in these different constructs are compared when the RFL reaches its maximum output power. The broadest SC spectrum of 100 nm and the highest output power of 1.1 W are obtained when the nested cavity structure is employed. The influences of the feedback FBGs and cavity constructs on the SC generation are analyzed by considering the Raman effect and four-wave mixing.
With a published model that describes a nested fiber Raman cavity using FBGs as reflectors, we have made numerical simulations for the comparison between the performance of P-doped and Ge-doped fiber. Although the former fibers are the standard choice for fiber Raman lasers due to the large Raman gain, the latter can be also of interest because they present a large Raman shift so that the configuration of the Raman fiber laser can be simplified. We have considered a two-step Raman laser using a P-doped fiber and a six-step Raman laser using a Ge-doped fiber, both pumped by 1060 nm and emitting at 1480 nm. The effects of the Raman fiber length, output coupler reflectivity and splice loss upon the behavior of both lasers are studied. Simulation results show that the P-doped fiber laser requires a longer fiber length while the Ge-doped fiber laser requires a higher output mirror reflectivity, and the RFL using Ge-doped fiber is more sensitive to the splice loss because of its large Stokes wave number. Finally, by comparison in the optimum configuration, we find that the P-doped fiber laser shows better output characteristics than Ge-doped fiber laser.
A bidirectionally pumped spectrum pre-sliced multi-wavelength fiber source is presented in the paper. Two 980nm laser diodes (LDs) are engaged to provide the pump power. An optimized double pass Mach-Zehnder interferometer with extinction ratio larger than 41dB is utilized as the comb filter. The extinction ratio of the fiber source is larger than 24.5dB in the whole C band, and almost reaches 29dB at 1530nm. Integral power of each channel is 0.58mW at 1550nm under 112.3mW total pump power. Channel spacing and bandwidth are 0.81nm and 0.30nm, respectively.
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