Optical coupling circuit

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	Optical coupling circuit
其他题名	Optical coupling circuit
	HONMO HIROSHI; ITO MASATAKA
	1992-11-13
专利权人	NEC CORP
公开日期	1992-11-13
授权国家	日本
专利类型	发明申请
摘要	PURPOSE:To obtain the small-sized optical coupling circuit having high efficiency in coupling between a semiconductor element and an optical fiber. CONSTITUTION:A near lens 2, the refractive index of which decreases in nearly square distribution with the distance from a central part and has the outside diameter nearly equal to the outside diameter of the glass part of the optical fiber is disposed in proximity to a semiconductor laser 1 on the optical axis of the light beam of 55mum wavelength outputted from the semiconductor laser The end face of the near parabolic lens 2 facing the semiconductor laser 1 side is polished to a hemispherical shape. The nearly focusing lens 2 is a multimode optical fiber having 125mum outside diameter, 50m core diameter and 0.2 numerical aperture. The semiconductor laser 1 is fixed onto a heat sink 3 in order to release heat. The single mode optical fiber 4 has 125mum outside diameter and 10mum core diameter. The near focusing lens 2 is equal in outside diameter to the optical fiber 4 and is small and, therefore, the optical coupling circuit is miniaturized and the coupling efficiency is as high as 3dB like heretofore.
其他摘要	目的：获得在半导体元件和光纤之间的耦合具有高效率的小尺寸光耦合电路。组成：一个近透镜2，其折射率几乎是方形分布，与中心部分的距离减小，外径几乎等于光纤玻璃部分的外径，设置在半导体附近激光器1在从半导体激光器1输出的55μm波长的光束的光轴上。近抛物面透镜2的面对半导体激光器1侧的端面被抛光成半球形。近聚焦透镜2是外径为125μm，芯径为50μm，数值孔径为0.2μm的多模光纤。半导体激光器1固定在散热器3上以释放热量。单模光纤4的外径为125μm，芯径为10μm。近聚焦透镜2的外径与光纤4相等并且很小，因此，光耦合电路小型化，并且耦合效率如上所述高达3dB。
主权项	-
申请日期	1991-04-25
专利号	JP1992324407A
专利状态	失效
申请号	JP1991095277
公开（公告）号	JP1992324407A
IPC 分类号	G02B6/42 \| H01L33/58 \| H01S5/00 \| H01L33/00 \| H01S3/18
专利代理人	-
代理机构	-
文献类型	专利
条目标识符	http://ir.opt.ac.cn/handle/181661/50693
专题	半导体激光器专利数据库
作者单位	NEC CORP
推荐引用方式 GB/T 7714	HONMO HIROSHI,ITO MASATAKA. Optical coupling circuit. JP1992324407A[P]. 1992-11-13.

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