Method and apparatus for an optical filter
文献类型：专利
| ; | |
| 作者 | XIE, PING; WU, SIMON YUANXINAG; MAO, YALAN; WANG, WEI; BETTMAN, R. BRAD; MALUF, NADIM |
| 发表日期 | 2002-10-24 ; 2002-10-24 |
| 专利号 | US20020154845A1 ; US20020154845A1 |
| 著作权人 | FINISAR CORPORATION ; FINISAR CORPORATION |
| 国家 | 美国 ; 美国 |
| 文献子类 | 发明申请 ; 发明申请 |
| 其他题名 | Method and apparatus for an optical filter ; Method and apparatus for an optical filter |
| 英文摘要 | The present invention provides optical filters that can be used in a range of telecommunications applications including optical multiplexers/demultiplexers, optical routers, and optical gain scalers. The optical filter is modular, using two or more couplers with a pair of delay paths between each pair of couplers in a sequence to generate a range of optical filter functions. The desired filter profile/function is obtained by proper selection of the coupling ratio for each coupler and by the length of each pair of delay paths. The couplers may be implemented as polarization or intensity beam splitters positioned along the optical path. Each coupler couples in controllable amounts, one or two inputs with the corresponding pair of delay paths. Where a coupler is implemented as a polarization beam splitter, the coupling is accomplished by input to the coupler of polarized light and by the subsequent separation of orthogonal "P" and "S" components of that light onto corresponding ones of the pair of delay paths. Where coupling is implemented with an intensity beam splitter, the coupling is accomplished by input of light with the percentage of reflection and transmission of the light determining the coupling ratio or percentage of the light input onto corresponding ones of the pair of delay paths. The pair of delay paths includes in an embodiment of the invention, passive thermal stabilization. The passive thermal stabilization of the filter(s) is accomplished by a plurality of optical elements positioned in and defining the optical path length of each member of the pair of paths. These optical elements are designed so that the optical path length difference between the pair of delay paths remains substantially invariant across a range of temperatures.; The present invention provides optical filters that can be used in a range of telecommunications applications including optical multiplexers/demultiplexers, optical routers, and optical gain scalers. The optical filter is modular, using two or more couplers with a pair of delay paths between each pair of couplers in a sequence to generate a range of optical filter functions. The desired filter profile/function is obtained by proper selection of the coupling ratio for each coupler and by the length of each pair of delay paths. The couplers may be implemented as polarization or intensity beam splitters positioned along the optical path. Each coupler couples in controllable amounts, one or two inputs with the corresponding pair of delay paths. Where a coupler is implemented as a polarization beam splitter, the coupling is accomplished by input to the coupler of polarized light and by the subsequent separation of orthogonal "P" and "S" components of that light onto corresponding ones of the pair of delay paths. Where coupling is implemented with an intensity beam splitter, the coupling is accomplished by input of light with the percentage of reflection and transmission of the light determining the coupling ratio or percentage of the light input onto corresponding ones of the pair of delay paths. The pair of delay paths includes in an embodiment of the invention, passive thermal stabilization. The passive thermal stabilization of the filter(s) is accomplished by a plurality of optical elements positioned in and defining the optical path length of each member of the pair of paths. These optical elements are designed so that the optical path length difference between the pair of delay paths remains substantially invariant across a range of temperatures. |
| 公开日期 | 2002-10-24 ; 2002-10-24 |
| 申请日期 | 2001-06-11 ; 2001-06-11 |
| 状态 | 授权 ; 授权 |
| 源URL | [http://ir.opt.ac.cn/handle/181661/52456]  |
| 专题 | 半导体激光器专利数据库 |
| 作者单位 | FINISAR CORPORATION |
| 推荐引用方式 GB/T 7714 | XIE, PING,WU, SIMON YUANXINAG,MAO, YALAN,et al. Method and apparatus for an optical filter, Method and apparatus for an optical filter. US20020154845A1, US20020154845A1. 2002-10-24, 2002-10-24. |
入库方式： OAI收割
来源：西安光学精密机械研究所
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