Abstract
A cylindrical waveguide structure with the running refractive index wave has been recently demonstrated as a means for the generation of high-repetition-rate pulse trains. The operation mechanism involves a proper combination of the frequency modulation and modulation instability simultaneously experienced by the input continuous wave (CW) signal as it propagates through the cylinder waveguide. Here, we explore the same idea but employ the cylindrical waveguide only as a part of the cascaded optical fiber configuration now comprising both passive and active optical fiber segments. The new system design enables the improved control of the pulse train formation process in the cascaded system elements, relaxes strong requirements for the CW signal power, and provides an additional optical gain for the advanced pulse peak power scaling. In particular, using a low-amplitude, weakly modulated, continuous wave as an input signal we explore and optimize the nonlinear mechanisms underlying its cascaded transformation into the train of kilowatt peak power picosecond pulses.
Highlights
Propagation of a light pulse in a waveguide with the running refractive index wave (RRIW) is accompanied by effects unavailable in the waveguide without RRIW [1,2]
We explore a new approach to the application of the cylindrical waveguide structure with RRIW for the generation of optical pulse trains
We have demonstrated generation of the subpicosecond pulses in the cascaded fiber configuration comprising the cylindrical waveguide with
Summary
Propagation of a light pulse in a waveguide with the running refractive index wave (RRIW) is accompanied by effects unavailable in the waveguide without RRIW [1,2]. It could be close to the speed of RRIW, leading to a pronounced resonance interaction between the AWGM and the RRIW, resulting in the formation of regular optical pulse trains This effect has been studied theoretically with a cylindrical waveguide structure comprising an RRIW [9,10]. We explore a new approach to the application of the cylindrical waveguide structure with RRIW for the generation of optical pulse trains In this approach, the cylindrical waveguide is just a part of the cascaded optical fiber configuration comprising passive and active optical fiber segments. In this system, the cylindrical waveguide structure with RRIW is responsible mainly for the frequency modulation of the propagating AWGM light, whereas the passive fibers with the anomalous group velocity dispersion (GVD) are mainly used as MI media. The generation of the pulse train comprising picosecond pulses with a kilowatt peak power is demonstrated from a 10 mW, weakly modulated, CW light employed as an input signal
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