已知双曲线\(\dfrac{{{x}^{2}}}{{{a}^{2}}}-\dfrac{{{y}^{2}}}{{{b}^{2}}}=1\left( a > 0,b > 0 \right)\)的离心率为\(\sqrt{2}\),过左焦点\({{F}_{1}}\left( -c,0 \right)\)作圆\({{x}^{2}}+{{y}^{2}}={{a}^{2}}\)的切线,切点为\(E\),延长\({{F}_{1}}E\)交抛物线\({{y}^{2}}=4cx\)于点\(P\),则线段\(PE\)的长为: