| [1] | HERTZ H.Compact bulk optical 90° hybrid for balanced phase diversity receivers[J].Electronics Letters,1989,25(22):11-12. |
| [2] | NORIMATSU S J,TAKACHIO N,INOUE Y,et al.An optical 90°-hybrid balanced receiver module using a planar lightwave circuit[J].IEEE Photonics Technology Letters,1994,6(6):737-740. |
| [3] | CHO P S,HARSTON G,KERR Ch J,et al.Improvement of coherent homodyne detection performance using time-gated amplification and LiNbO3 optical 90° hybrid [J].Proceedings of SPIE,2004,5403:762-773. |
| [4] | HOFFMANN D,HEIDRICH H,WWNKE G,et al.Integrated optics eight-port 90° hybrid on LiNbO3[J].Journal of Lightwave Technology,1989,7(5):794-798. |
| [5] | LEEB W R.Optical 90° hybrid for costas-type receivers[J].Electronics Letters,1990,26 (18):1431-1432. |
| [6] | TSUNETSUGU H,HOSOYA M,NORIMATSU S J,et al.A packaging technique for an optical 90°-hybrid balanced receiver using a planar lightwave circuit[J].IEEE Transactions on Components,Packaging,and Manufacturing Technology,1996,B19(3):569-574. |
| [7] | KAZOVSKY L G,CURTIS L,YOUNG W C,et al.All-fiber 90°optical hybrid for coherent communications[J].Applied Optics,1987,26(3):437-439. |
| [8] | SEIMETZ M,WEINERT C M.Options,feasibility,and availability of 2×4 90° hybrids for coherent optical systems[J].Journal of Lightwave Technology,2006,24(3):1317-1322. |
| [9] | GARRESI R,ZEISS C.90° optical hybrid for coherent receivers[J].Proceedings of SPIE,1991,1522:210-219. |
| [10] | LEEB W R.Realization of 90°and 180° hybrids for optical frequencies[J].Archiv für Elektronik und ebertragungstechnik,1983,37(5/6):203-206. |
| [11] | BAN W H,WAN L Y,LIU L R.A new optical hybrid of differential grating[J].Journal of Guangxi University(Natural Science Edition),2010,35(2):359-362(in Chinese). |
| [12] | ZHAO H J,YUAN D R,QIAO N Sh,et al.Polarization and blazing characteristics of subwavelength dielectric polarization gratings[J].High Power Laser and Particle Beams,2008,20(5)：725-728(in Chinese). |
| [13] | ZHAO H J,YUAN D R,WU Zh M.Research development of subwavelength polarization gratings[J].Laser & Optoelectronics Progress,2008(3):38-43(in Chinese). |
| [14] | LU X D，FU K X,WANG Zh H,et al.Design of quarter wave-plate using sinusoidal dielectric subwavelength gratings[J].Laser Technology,2003,27(4):368-370(in Chinese). |
| [15] | LAJUNEN H,TERVO,TURUNEN J.High-efficiency broadband diffractive elements based on polarization gratings[J].Optics Letters,2004,29(8):803-805. |