Geometrical representation of coherent tunneling process in two-waveguide and three-waveguide coupler
We propose an identical geometrical representation scheme for both Landau-Zener （LZ） tunneling process in two-waveguide coupler with a cubically bent structure and stimulated Raman adiabatic passage （STIRAP） in three-waveguide coupler, similar to the geometrical representation of sum frequency proce...
Saved in:
| Published in | Chinese physics B Vol. 26; no. 12; pp. 324 - 331 |
|---|---|
| Main Author | |
| Format | Journal Article |
| Language | English |
| Published |
01.12.2017
|
| Online Access | Get full text |
| ISSN | 1674-1056 2058-3834 |
| DOI | 10.1088/1674-1056/26/12/124214 |
Cover
| Summary: | We propose an identical geometrical representation scheme for both Landau-Zener （LZ） tunneling process in two-waveguide coupler with a cubically bent structure and stimulated Raman adiabatic passage （STIRAP） in three-waveguide coupler, similar to the geometrical representation of sum frequency process. The results show that although the two-waveguide coupler with a cubically bent axis has not aperiodic structure, it acts as a chirped quasi-phase-matching （QPM） grating and corrects the relative phase between the two supermodes in the curved coupler system. We present a scheme about how to choose the parameters to design the curved beam splitter. |
|---|---|
| Bibliography: | optical coupler; adiabatic passage; non-adiabatic passage; Bloch vector We propose an identical geometrical representation scheme for both Landau-Zener （LZ） tunneling process in two-waveguide coupler with a cubically bent structure and stimulated Raman adiabatic passage （STIRAP） in three-waveguide coupler, similar to the geometrical representation of sum frequency process. The results show that although the two-waveguide coupler with a cubically bent axis has not aperiodic structure, it acts as a chirped quasi-phase-matching （QPM） grating and corrects the relative phase between the two supermodes in the curved coupler system. We present a scheme about how to choose the parameters to design the curved beam splitter. Jian Shi, Rui-Qiong Ma, Zuo-Liang Duan, Meng Liang, Bao-Yu Chai, Jun Dong（School of Electronic Engineering, Xian University of Posts and Telecommunications, Xian 710121, China） 11-5639/O4 |
| ISSN: | 1674-1056 2058-3834 |
| DOI: | 10.1088/1674-1056/26/12/124214 |