QQ客服 官方微博 反馈留言

	Improvements in or relating to optical couplers
	PING KING TIEN
	1972-08-31
著作权人	WESTERN ELECTRIC COMPANY INCORPORATED
专利号	GB1287035A
国家	英国
文献子类	授权发明
其他题名	Improvements in or relating to optical couplers
英文摘要	1287035 Optical couplers WESTERN ELECTRIC CO Inc 22 Jan 1970 [24 Jan 1969 21 April 1969] 3078/70 Heading G2J [Also in Division H3] An optical coupler comprises a thin film 12, 13 of optical material the major surfaces of which are plane parallel and the index of refraction n 2 , and a prism 16 having an index of refraction n 3 , the prism being adapted for internal reflection of light at a first surface 18 disposed parallel to the major surfaces of the thin film 13 and separated therefrom by a gap of refractive index n 1 to partially frustrate the internal reflection, the major surface remote from the gap being in contact with an environment 14 (e.g. a substrate) having a refractive index n 4 , n 3 being larger than the largest of n 4 , and n 1 , and the coupler, when suitably orientated to receive a coherent light beam, providing phase-matched coupling of said beam to a wave propagating in the thin film transverse to the direction of the beam. The prism and the thin film 12 are optically decoupled beyond the region of frustrated internal reflection. The decoupling may be effected by providing the prism with a second surface 21 cut at an obtuse angle to surface 18. The gap of refractive index n 1 may be air or it may be a dielectric material. Where such a material is used the decoupling may be effected by increasing the thickness of the dielectric material. Light propagating in the thin film may be coupled out of the film using either another portion of the said input prism 16 surface, or using a second prism. In one embodiment Fig. 4 (not shown) the coupler also includes a reflector to intercept light which has passed through the prism 16. This forms an optical resonator and causes light to propagate in two directions along the thin film. Two output prisms are used in that embodiment. In another embodiment Fig. 6 the prism 86 receives a plurality of signal coherent light beams 91, 92, 93, at different angles, and phase-match couples them to different waves propagating in thin film 83. These different waves are coupled out by a prism 97. Prisms 86, 97 have multiple faces through different ones of which different beams and waves are coupled. The light propagating in the thin film may be modulated during passage therethrough; the thin film could then be gallium arsenide having its crystalline axis normal to the planes of modulating electrodes and the substrate could be sapphire. Alternatively the thin film may be a semi-conductive junction region, semiconductive material of different types being located on opposite sides of the junction region. The dielectric gap in the coupling or uncoupling region is less than one wavelength of the light waves being propagated. In an amplifier a frequency shifter Fig. 10 signal energy 211 and pump energy 225 are fed to prism 216 and hence waveguide 212. A desired abstracted beam is coupled out by prism 222.
公开日期	1972-08-31
申请日期	1970-01-22
状态	失效
内容类型	专利
源URL	[http://ir.opt.ac.cn/handle/181661/39374]
专题	半导体激光器专利数据库
作者单位	WESTERN ELECTRIC COMPANY INCORPORATED
推荐引用方式 GB/T 7714	PING KING TIEN. Improvements in or relating to optical couplers. GB1287035A. 1972-08-31.

个性服务

查看访问统计

相关权益政策

暂无数据

收藏/分享

除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。