Fig. 3

Splitting ratio in a frequency beam splitter for forward and backward propagation. The variation in splitting ratios as a function of input BS-FWM pump power is depicted for a forward and b backward propagation. The experimentally measured transmittance and reflectance are presented by blue squares and red diamonds, respectively. The fitting of these data points is achieved through solid blue lines for transmittance and dashed red lines for reflectance, both of which are modeled as envelopes of sinusoidal functions