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

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4 Author(s)
Han-Bin Lin ; Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei, Taiwan ; Su, J.-Y. ; Wei, Pei-Kuen ; Wang, Way‐Seen

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

Published in:

Quantum Electronics, IEEE Journal of  (Volume:30 ,  Issue: 12 )