Chinese Optics Letters, 2008, 6 (9): 640, Published Online: Sep. 11, 2008
Central distance of interferential mode patterns of elliptical core two-mode fiber Download: 634次
椭圆芯双模光纤 模斑 模间干涉 相位差 中心间距 060.2270 Fiber characterization 060.2370 Fiber optics sensors 060.2400 Fiber properties 120.4820 Optical systems
Abstract
By means of the weakly guiding approximation, the mode spot sizes Wx and Wy of the fundamental mode along the semimajor (x-direction) and semiminor (y-direction) axes of the fiber core in elliptical core two-mode fiber are discussed. The variation of their ratio value Wx/Wy with the operation wavelength \lambda and the length ratio a/b between the semimajor axis and the semiminor axis of the fiber core is analyzed. Based on this analysis, the distribution figures of two-lobe interferential mode patterns are evaluated and simulated quantitatively for different phase difference changes between LPLP01 and LP11 modes. The two-lobe interferential mode patterns have the same profile and distribute symmetrically when the phase difference equals \pi. Their central distance S becomes larger when Wx/Wy augments gradually. Furthermore, the equation about the central distance S of the two-lobe interferential mode patterns is given when the operation wavelength varies between 0.65 and 1.31 \mum, which is important to applications shuch as sensors and coupling devices between different fibers.
Archan Kumar, Sourangshu Mukhopadhyay. Central distance of interferential mode patterns of elliptical core two-mode fiber[J]. Chinese Optics Letters, 2008, 6(9): 640.