JPH01155007U

JPH01155007U -

Info

Publication number: JPH01155007U
Application number: JP4964088U
Authority: JP
Priority date: 1988-04-13
Filing date: 1988-04-13
Publication date: 1989-10-25

Description

[Brief explanation of the drawing]

第１図は、この考案の一実施例による光合分波
モジユールを示す断面図、第２図は、従来の光合
分波モジユールを示す断面図である。１は半導体発光素子、２は半導体発光素子の出
力光を集光する第１のレンズ、３は半導体受光素
子、４はλ_１，λ_２の波長の光を分岐又は結合を
行う機能を持つた分岐・結合素子、５は断面が同
軸状の２重コア構造をしており、２重コアの内側
のコア内が単一モード導波路、２重コアの外側の
コア内が多モード導波路構造である光フアイバ、
６は５の光フアイバと４の分岐・結合素子を結合
させる第２のレンズ、７はφａの穴の空いたλ_１以外の波長の光を通過させる帯域しや断フイルタ
、８，９は１の半導体発光素子の出力光、１０，
１１は光フアイバ５から入力されるλ_２の波長を
持つ入力光である。 FIG. 1 is a sectional view showing an optical multiplexing/demultiplexing module according to an embodiment of this invention, and FIG. 2 is a sectional view showing a conventional optical multiplexing/demultiplexing module. 1 is a semiconductor light emitting device, 2 is a first lens that condenses the output light of the semiconductor light emitting device, 3 is a semiconductor light receiving device, and 4 has a function of branching or combining light of wavelengths λ ₁ and λ ₂ . The branching/coupling element 5 has a double core structure with a coaxial cross section, the inner core of the double core is a single mode waveguide, and the outer core of the double core is a multimode waveguide structure. Optical fiber, which is
6 is a second lens that couples the optical fiber in 5 with the branching/coupling element in 4, and 7 is a λ ₁ with a hole of φa. 8, 9 are output lights of the semiconductor light emitting device 1; 10,
Reference numeral 11 denotes input light having a wavelength of λ ₂ input from the optical fiber 5 .

Claims

[Scope of utility model registration request]

a semiconductor light emitting element that emits light at a wavelength λ ₁ ; a first lens that collects output light of the semiconductor light emitting element;
_a light-receiving element that receives light of wavelength λ ₂ ;
At least one branching/coupling element having the function of branching or coupling light with a wavelength of λ ₂ , and one or more double core structures with a coaxial cross section for inputting and outputting light. an optical fiber having a single mode waveguide in the inner core of the double core and a multimode waveguide in the outer core of the double core; and a second optical fiber for coupling light to the optical fiber. 1. An optical multiplexing/demultiplexing module comprising: a lens; and a band cutoff filter that cuts off wavelength λ ₁ , which is installed between the second lens and an optical fiber.