[OPTICAL REVIEW Vol. 18, No. 1 (2011) 117-123]
© 2011 The Japan Society of Applied Physics

Optical Interconnection between Different Spatial Modes Using Double Phase Conjugate Mirror with Polarization Alignment System

Yuta WAKAYAMA, Atsushi OKAMOTO, Alexander A. GRABAR1, and Kunihiro SATO2

Graduate School of Information Science and Technology, Hokkaido University, Sapporo 060-0814, Japan
1Institute of Solid State Physics and Chemistry, Uzhgorod National University, Uzhgorod 88000, Ukraine
2Faculty of Engineering, Hokkai-Gakuen University, Sapporo 064-0926, Japan

(Received May 31, 2010; Revised October 8, 2010; Accepted October 14, 2010)

We propose a fundamental interconnection method using a polarization alignment system for waveguides having different spatial modes. In addition, as an example for the verification of the fundamental operation, we demonstrate an interconnection between a photonic crystal fiber and a laser that have obviously different spatial modes. The polarization alignment system operates synergistically with a self-written waveguide formed with a double phase-conjugate mirror. This technique enables us to interconnect a photonic crystal fiber with a laser source without complicated and time-consuming optical alignment. In this method, although it is not necessary to perform an external control for interconnection, the waveguide most suitable for connection is formed autonomously in a Sn2P2S6:Sb crystal developed for this purpose. There was a marked reduction in the polarization dependence of coupling efficiency, compared with that observed using a stand-alone double phase-conjugate mirror.

Key words: optical interconnection, photonic crystal fiber, photorefractive effect, Sn2P2S6 crystal, double phase-conjugate mirror