发明名称 |
POLARIZATION BEAM SPLITTER OR COMBINER |
摘要 |
This invention relates to elements such as birefringent crystals, which are used to separate a non-collimated input beam into two orthogonally polarized sub-beams or to combine two orthogonally polarized beams into a single beam. The optical device lessens or obviates the optical path length difference encountered in prior art devices and provides a polarization beam splitter / combiner that has substantially same optical pa th lengths for two split or combined beams propagating therethrough. Alternatively, the device is designed to provide a selected path length difference to compensate for polarization mode dispersion in other optical devices. The polarization beam splitter/combiner in accordance with the invention has a first uniaxial crystal having an o-ray path and an e- ray path and having the first port disposed at an end face thereof; a second uniaxial crystal having an o-ray path and an e-ray path, the e-ray path of the second uniaxial crystal being optically coupled with the o-ray path of the first uniaxial crystal and the o- ray path of the second uniaxial crystal being optically coupled with the e-r ay path of the first uniaxial crystal. Alternatively, the axis of the second crystal is aligned in such a manner that the o- ray path is retarded by an extraordinary index of refractionof the crystal and the e-ray path is retarded by an ordinary index of refraction to equalize the optical path lengths.
|
申请公布号 |
CA2344021(A1) |
申请公布日期 |
2001.10.20 |
申请号 |
CA20012344021 |
申请日期 |
2001.04.12 |
申请人 |
JDS UNIPHASE INC. |
发明人 |
CHENG, YIHAO;WILLS, GONZALO;DELISLE, VINCENT;SPICER, DEAN SHELDON;WALL, PIERRE D.;MCLAUGHLIN, SHELDON;HNATIW, ALAN J.P. |
分类号 |
G02B5/30;G02B6/12;G02B6/32;G02B6/34;G02B27/28;(IPC1-7):G02B27/10 |
主分类号 |
G02B5/30 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|