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	Method and apparatus for mode conversion
	DOERR, CHRISTOPHER RICHARD; STULZ, LAWRENCE WARREN
	2007-05-08
著作权人	WSOU INVESTMENTS, LLC
专利号	US7215852
国家	美国
文献子类	授权发明
其他题名	Method and apparatus for mode conversion
英文摘要	Spot-size conversion for interfacing a first optical element having a higher refractive index to a second optical element having a lower refractive index is achieved through the use of two optical star couplers coupled to each other through a plurality of optical paths embedded in a planar waveguide. The beam from the high refractive index element is introduced into a high numerical aperture (NA) star coupler, which directs the beam through a plurality of optical paths to a second star coupler with a lower numerical aperture than the first star coupler so that its output spot-size is larger. The output port of the second star coupler is interfaced to the lower refractive index element. Wavelength selection can be provided by making non-zero path-length differences between adjacent optical paths between the two star couplers. Wavelength tunability can be provided by including phase shifters in the paths between the two star couplers to alter the effective optical lengths of the paths to selectively produce the desired phase interference pattern at the desired wavelength.
公开日期	2007-05-08
申请日期	2003-11-07
状态	授权
内容类型	专利
源URL	[http://ir.opt.ac.cn/handle/181661/37020]
专题	半导体激光器专利数据库
作者单位	WSOU INVESTMENTS, LLC
推荐引用方式 GB/T 7714	DOERR, CHRISTOPHER RICHARD,STULZ, LAWRENCE WARREN. Method and apparatus for mode conversion. US7215852. 2007-05-08.

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