PLANO-CONVEX LENS, FIBER ARRAY MODULE AND LIGHT RECEIVING MODULE

• Main Authors: TERUI HIROSHI, NAKAHARA MOTOHIRO
• Format: Patent
• Language: English; Japanese
• Published: 15.11.2018
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHYSICS; SEMICONDUCTOR DEVICES

PROBLEM TO BE SOLVED: To provide a reflection type lens-optical fiber coupling system in which a beam reflected by a filter is efficiently coupled to a second fiber even when an interval between a first optical fiber and a second optical fiber is narrow .SOLUTION: A plano-convex lens 20 is provided that comprises a flat surface 21A and a lens surface 23. The lens surface 23 comprises a first convex surface A1 and a second convex surface A2 each of which has a spherical shape and is arranged on a flat base surface 21B. A diameter of a first virtual circle formed on the base surface 21B by the first convex surface A1 and a diameter of a second virtual circle formed on the base surface 21B by the second convex surface A2 are each larger than a center-to-center distance dbetween the first virtual circle and the second virtual circle.SELECTED DRAWING: Figure 1 【課題】第１の光ファイバと第２の光ファイバとの間隔が狭い場合であっても、フィルタで反射されたビームを第２のファイバへ効率よく結合させる反射型のレンズ−光ファイバ結合系を提供する。【解決手段】平坦面２１Ａ及びレンズ面２３を備える平凸レンズ２０であって、レンズ面２３は、平坦なベース面２１Ｂ上に配置された、球面形状を有する第１凸面Ａ１及び第２凸面Ａ２を備え、第１凸面Ａ１によってベース面２１Ｂ上に形成される第１仮想円の直径、及び、第２凸面Ａ２によってベース面２１Ｂ上に形成される第２仮想円の直径が、第１仮想円及び第２仮想円の中心間距離ｄｐよりも大きい、平凸レンズである。【選択図】図１