A tunable wavelength interchanging cross connect scheme utilizing two periodical

A tunable wavelength-interchanging cross-connect (WIXC) scheme is proposed by utilizing two periodically poled LiNbO3 waveguides. A fiber Brag grating is utilized to link the two waveguides so as to configurate the double-pass operation. In each waveguide, sum frequency generation (SFG) and differen