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Qualitative analysis of ultra-short optical dissipative solitary pulsesin the actively mode-locked semiconductor heterolaserswith an external fiber cavity

机译:定性分析超短光耗散孤立脉冲 r n在具有外部光纤腔的有源锁模半导体异质激光器中 r n

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An advanced qualitative characterization of simultaneously existing various low-power trains of ultra-short optical pulses with an internal frequency modulation in a distributed laser system based on semiconductor heterostructure is presented. The scheme represents a hybrid cavity consisting of a single-mode heterolaser operating in the active mode-locking regime and an external long single-mode optical fiber exhibiting square-law dispersion, cubic Kerr nonlinearity, and linear optical losses. In fact, we consider the trains of optical dissipative solitons, which appear within double balance between the second-order dispersion and cubic-law nonlinearity as well as between the active-medium gain and linear optical losses in a hybrid cavity. Moreover, we operate on specially designed modulating signals providing non-conventional composite regimes of simultaneous multi-pulse active mode-locking. As a result, the mode-locking process allows shaping regular trains of picosecond optical pulses excited by multi-pulse independent on each other sequences of periodic modulations. In so doing, we consider the arranged hybrid cavity as a combination of a quasi-linear part responsible for the active mode-locking by itself and a nonlinear part determining the regime of dissipative soliton propagation. Initially, these parts are analyzed individually, and then the primarily obtained data are coordinated with each other. Within this approach, a contribution of the appeared cubically nonlinear Ginzburg-Landau operator is analyzed via exploiting an approximate variational procedure involving the technique of trial functions.
机译:提出了基于半导体异质结构的分布式激光系统中同时存在的各种超短光脉冲低功率序列和内部频率调制的高级定性表征。该方案表示一个混合腔,该混合腔由以主动锁模方式工作的单模异质激光器和表现出平方律色散,立方克尔非线性和线性光学损耗的外部长单模光纤组成。实际上,我们考虑了光耗散孤子列,它们出现在二阶色散和三次律非线性之间的双重平衡以及混合腔中的有源介质增益和线性光学损耗之间。此外,我们对经过特殊设计的调制信号进行操作,提供了同时进行多脉冲主动锁模的非常规复合方式。结果,锁模过程允许对由多脉冲激发的皮秒级光脉冲的规则序列进行整形,而这些脉冲独立于彼此的周期性调制序列。这样做时,我们将排列好的混合腔体看作是负责主动锁模的准线性部分和确定耗散孤子传播状态的非线性部分的组合。最初,将对这些部分进行单独分析,然后将最初获得的数据相互协调。在这种方法中,通过利用涉及试验函数技术的近似变分程序来分析出现的立方非线性Ginzburg-Landau算子的贡献。

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