文档介绍：摘要 We investigate A single-mode fiber coupler to the Ti diffused LiNbO3 strip waveguide has been devised. W as designed and experimentally demonstrated. In particular, we demonstrate experimentally the situation where light is launched into one ? ber and coupled equally to the other two ? bers. The effects of changing the surrounding refractive index are investigated. Using three , we ? nd that the peak coupling ef? ciency increases by9 and 14 dB, ast he surrounding increase from to The side-lobe suppression ratio varies between and dB. We achieve a total power conversion ef? ciency of 85% at the resonance wavelength with a surrounding refractive index of The influences of three axial displacements and two angular misalignments on the coupling efficiency have been investigated at 6328-A wavelength The coupler has a special feature wherein coupling degradation caused by fiber dis-placement after connection can be recovered to the initial state. The total optical insertion loss is3 dB after fixing the fiber to the LiNbO3 strip waveguide, which is4 gm wide and 8 mm long. 引言 there is increased interest in wavelength division multiplexed (WDM) munications systems. As demands for dynamically tunable wavelength ponents in wavelength division multiplexing (WDM)system have increased in recent years, Recently the wavelength-selective coupler based on two paralle