METHOD FOR ADHERING PRISM COUPLER AND COUPLER PRISM,申请号JP19940241705-传众专利搜索

METHOD FOR ADHERING PRISM COUPLER AND COUPLER PRISM

申请公布号：JPH08106025(A)

申请号：JP19940241705

申请日期：1994.10.05

申请公布日期：1996.04.23

申请人：

SHARP CORP

发明人：MINAMI KOJI;YOSHIDA YOSHIO;KURATA YUKIO;YAMAMOTO HIROYUKI;OKADA NORIAKI

分类号：G02B6/34;G02B6/122;G02B6/42;(IPC1-7):G02B6/34

主分类号：G02B6/34

摘要：PURPOSE: To prevent the degradation in coupling efficiency of a prism coupler by a fluctuation in wavelength of a light source by forming a first dielectric layer having the transmission efficiency of incident light on a second dielectric substance satisfying specific conditions via a first dielectric layer. CONSTITUTION: The third, second and first dielectric layers 2 to 4 are formed in this order on a substrate 1. A coupler prism 5 is arranged on the first dielectric layer 4 of the uppermost layer. The first dielectric layer 4 is so formed that the transmission efficiency T attains the value larger than 0.025/μm when the transmission efficiency of the incident light arriving at the second dielectric layer 3 which is a waveguide layer via the first dielectric layer 4 from the coupler prism 5. Namely, the layer thickness of the first dielectric layer 4 is set at, for example, 250nm in order to satisfy this condition T>0.025/μm. In such a case, the standardized radiation coefft. Km when a TE mode is made incident on the coupler prism 5 attains 3.12×10<-3> when this coefft. is calculated. The transmission efficiency T attains 0.049/μm and satisfies the condition T>0.025/μm.