Nonlinear optical loop mirror with low birefringence twisted fiber in the loop

Analysis of the nonlinear optical loop mirror with feedback and low-birefringence twisted fiber in the loop

“…The equations are normalized to the distance s = L/L b where L is the length of the fiber (in meters) and L B is the beat length of the fiber. Following [6,17], it is defined that µ = π 2 + g 2 where g is the ratio of circular to linear birefringence, given as g = γπ/k, with γ = [h/(2n) − 1]q being the circular birefringence term (h ∼ 0.13 − 0.16 for silica fibers [8]), and k = πδn/λ is the linear birefringence term. The normalized power is given as P N = bπP in /k where P in is the input power in the fiber, and b = 4πn 2 /3λA ef f is the nonlinearity where n 2 ∼ 2.5 × 10 −20 m 2 /W is the Kerr coefficient [12] and A ef f is the effective modal area.…”

“…The NOLM with feedback was first examined by Shi [3], and further analysis using different approaches including linear stability analysis was reported in [4,5]. As devices which use the NOLM became more understood, it was found that polarization plays an important role in its performance [6][7][8][9][10]. However most of these papers consider a pulse input to the system, and are therefore able to simplify the beam propagation equations without including cross phase modulation (XPM) effects in the pulse interactions.…”