Azaña José
Institut National de la Recherche Scientifique - Energie, Matériaux et Télécommunications, 800 de la Gauchetière Ouest, Suite 6900, Montréal, Québec H5A 1K6, Canada.
Opt Lett. 2008 Jan 1;33(1):4-6. doi: 10.1364/ol.33.000004.
It is demonstrated that a uniform fiber Bragg grating (FBG) working in the linear regime inherently behaves as an optical temporal integrator over a limited time window. Specifically, the reflected temporal waveform from a weak-coupling uniform FBG is proportional to the time integral of an (arbitrary) optical pulse launched at the component input. This integration extends over a time window fixed by the duration of the squarelike temporal impulse response of the FBG. Ultrafast all-optical integrators capable of accurate operation over nanosecond time windows can be implemented using readily feasible FBGs. The introduced concepts are demonstrated by numerical simulations.
结果表明，工作在线性区域的均匀光纤布拉格光栅（FBG）在有限的时间窗口内本质上表现为一个光学时间积分器。具体而言，来自弱耦合均匀FBG的反射时间波形与在该器件输入端发射的（任意）光脉冲的时间积分成正比。这种积分作用在由FBG的方形时间脉冲响应持续时间所确定的时间窗口内进行。利用易于实现的FBG能够实现可在纳秒时间窗口内精确运行的超快全光积分器。通过数值模拟验证了所提出的概念。
