[21p-E204-1~6] 3.14 Optical control devices and optical fibers

△ [21p-E204-5] Accurate Wavefront Conversion from a Gaussian Beam to a Spatial Mode by using Iterative Spatial Cross Modulation

〇Tomohiro Maeda¹, Atsushi Okamoto¹, Kazuhisa Ogawa¹, Akihisa Tomita¹, Daiki Soma², Yuta Wakayama², Takehiro Tsuritani² (1.Hokkaido Univ., 2.KDDI Research Inc.)

Keywords:optical fiber communication, complex amplitude modulation, mode-division multiplexing

Iterative spatial cross modulation (ISCM) is a method for generating an arbitrary complex wavefront. However, in ISCM, the input beam is assumed to be a plane wave having a uniform intensity distribution. In this research, we propose an improved algorithm for ISCM, leading to adapt to the input beam having the Gaussian intensity distribution by improving the constraint in the iterative process. Numerical simulation assuming that the converted beam is coupled into a six-mode fiber shows that highly accurate mode conversion from a Gaussian beam to LP_11e is successfully performed with 27 dB lower modal crosstalk than the conventional algorithm.<iframe border="0" frameborder="0" height="80" name="weblioExtensionsFrame" scrolling="no" src="//api.weblio.jp/act/quote/v_1_0/e/?q=Gaussian&type=emicro&opul=chrome-extension%3A%2F%2Foingodpdjohhkelnginmkagmkbplgema%2Foptions.html" style="font-size: 16px;" width="380"></iframe>