A new technique is proposed for integration of bulky optical components by means of a specific graded-index fiber in which the fundamental mode has a large mode-field diameter (MFD). A wide-beam propagating (WBP) fiber with the field diameter as large as 60 µm was successfully fabricated, which will enable bulky optical components that have no wave-guiding structures to be embedded into a fiber circuit without any lenses. It was confirmed that a 5-mm-thick silicon plate, for example,can be integrated into the fiber with a loss of less than 1 dB. A hemispherically ended WPB fiber for much longer bulky components is also proposed.
© 2005 IEEE
Kazuo Shiraishi, Hidehiko Yoda, Yukihisa Tamura, and Nobuyuki Kawasaki, "Wide-Beam Propagating Fiber for Inline Optical Components," J. Lightwave Technol. 23, 1774- (2005)