Design and application of very low-loss abrupt bends in optical waveguides

Author

Lin, Han-Bin ; Su, Jung-Young ; Wei, Pei-Kuen ; Wang, Way-Seen

Author_Institution

Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei, Taiwan

Volume

30

Issue

12

fYear

1994

fDate

12/1/1994 12:00:00 AM

Firstpage

2827

Lastpage

2835

Abstract

A new low-loss abrupt bend structure of the microprism type is proposed. This new bend uses a microprism to compensate for the phase difference of the phase front before and after the bend corner, so the entire phase front of the eigenmode is tilted properly, resulting in a very low-loss characteristic. Simulated results show that a normalized transmitted power of greater than 95% is achieved for a bend angle of 10°. Moreover, a phase compensation rule and its corrections are presented to determine the optimal prism parameters. Application examples of the microprism to design a very low-loss large-angle Z-bend and two cascaded Z-bends are also shown

Keywords

integrated optics; optical design techniques; optical elements; optical losses; optical prisms; optical waveguides; 95 percent; bend angle; cascaded Z-bends; large-angle Z-bend; low-loss abrupt bend structure; microprism; microprism type bends; normalized transmitted power; optical waveguides; optimal prism parameters; phase compensation rule; phase difference; phase front; Acceleration; Couplings; Degradation; Integrated optics; Optical crosstalk; Optical design; Optical losses; Optical waveguides; Packaging; Refractive index;

fLanguage

English

Journal_Title

Quantum Electronics, IEEE Journal of

Publisher

ieee

ISSN

0018-9197

Type

jour

DOI

10.1109/3.362727

Filename

362727