Mode coupling optical waveguide grating

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	Mode coupling optical waveguide grating
其他题名	Mode coupling optical waveguide grating
	STRASSER, THOMAS A.
	1998-03-18
专利权人	LUCENT TECHNOLOGIES INC.
公开日期	1998-03-18
授权国家	欧洲专利局
专利类型	发明申请
摘要	Reflective mode coupling refractive index gratings are disclosed. The gratings can couple light of wavelength λi in a fundamental spatial mode of the waveguide (e.g., LP01) to a reflected higher order spatial mode (e.g., LP11), substantially without reflection of any light of wavelength λj ≠ λi in a spectral range Δλ ≲ 0.01 λi. The mode coupling gratings (MCGs) can find a variety of uses in optical waveguide systems. Exemplarily, an MCG can serve as a wavelength-dependent loss element with abrupt (e.g., ∼1 nm) spectral dependence. However, a chirped grating with or without strength modulation can yield an MCG having relatively wide spectral dependence, including variable loss over a relatively wide (e.g., ∼10 nm) spectral range. Both types of MCGs are advantageously used in, for instance, optical waveguide amplifiers.
其他摘要	公开了反射模式耦合折射率光栅。光栅可以将波导（例如，LP01）的基本空间模式中的波长λi的光耦合到反射的更高阶空间模式（例如，LP11），在光谱范围Δλ中基本上没有反射波长λj≠λi的任何光。 ≲0.01λi。模式耦合光栅（MCG）可以在光波导系统中找到各种用途。示例性地，MCG可以用作具有突然（例如，~1nm）光谱依赖性的波长相关损耗元件。然而，具有或不具有强度调制的啁啾光栅可以产生具有相对宽的光谱依赖性的MCG，包括在相对宽（例如，~10nm）光谱范围内的可变损耗。两种类型的MCG有利地用于例如光波导放大器。
主权项	An article comprising an optical waveguide adapted for guiding electromagnetic radiation of at least two wavelengths λ i and λ j in a spectral region of spectral width Δλ, said optical waveguide comprising a length of multimode optical waveguide (83), said length of multimode optical waveguide comprising a blazed refractive index grating (84) of pitch A and blaze angle θ, with Λ and θ selected such that the grating causes coupling between a symmetric fundamental spatial mode of electromagnetic radiation of wavelength λ i and a higher order spatial mode of said electromagnetic radiation of wavelength λ i ; CHARACTERIZED IN THAT a) the blazed refractive index grating is a short-period refractive index grating, with Λ < 1µm; b) the blaze angle θ is greater than θ o, where θ o is a blaze angle that provides essentially optimal coupling between said symmetric fundamental spatial mode and said higher order spatial mode for electromagnetic radiation of wavelength λ i; and c) θ is selected such that the grating causes substantially less reflection of said symmetric fundamental mode radiation of wavelength λ j than is caused by an, otherwise identical, comparison grating having θ = θ o.
申请日期	1997-09-02
专利号	EP0829740A2
专利状态	失效
申请号	EP1997306780
公开（公告）号	EP0829740A2
IPC 分类号	G02B6/02 \| G02B6/126 \| G02B6/14 \| G02B6/34 \| H01S3/067 \| G02B6/16
专利代理人	-
代理机构	WATTS, CHRISTOPHER MALCOLM KELWAY, DR.
文献类型	专利
条目标识符	http://ir.opt.ac.cn/handle/181661/52101
专题	半导体激光器专利数据库
作者单位	LUCENT TECHNOLOGIES INC.
推荐引用方式 GB/T 7714	STRASSER, THOMAS A.. Mode coupling optical waveguide grating. EP0829740A2[P]. 1998-03-18.

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